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10. What could the pH of a solution be if a cyanidin indicator turned blue? What is used to determine the endpoint of a titration? (Choose all that apply)
D 4
5
06
07
Answer:
The cyanidin indicator turns blue within a pH range of 5 - 7. The pH of the solution could be 5, 6 or 7.
An indicator is used to determine the endpoint of a titration.
Explanation:
Cyanidin indicator changes colour with each change in pH. In acidic solutions (pH < 7) cyanidin indicator will turn red, through to purple and blue, while in basic solutions (pH > 7), cyanidin indicator will change colour from aquamarine through to green and yellow. The cyanidin indicator turns blue within a pH range of 5 - 7.
Titration is a technique used in analytical chemistry to determine the unknown concentration of a solution. A solution of known concentration is added from a burette to the solution of unknown concentration until the reaction between the two solutions is complete. This known as the endpoint of the experiment. The endpoint of a titration is determined using an indicator which is added to reaction mixture. A colour charge is produced by the indicator at the endpoint of the reaction.
Note: An indicator is a dye of weak organic acids or bases which changes colour with changes in the pH of a solution. Some common indicators are methyl orange, methyl red, phenolphthalein, etc. These indicators are used to monitor the changes in the pH of solutions during a reaction.
Answer:
5,7,6
Explanation:
Took the quiz! Good luck!
HELP PLEASE!!!!
Can someone answer it as a paragraph please I should submit it today
Answer:
Jodi is violating two rules; She is not wearing any safety equipment and managed to catch fire to herself. She is also not wearing gloves or safety goggles like the other two. Kimberly is leaving fire unattended, and can cause many accidents and if chemicals come in contact in the wrong way, it could be catastrophic. Kimberly is also carelessly using a fire extinguisher carelessly and chemicals in the can cause accidents.
Explanation:
I hope this helps <3
When aqueous solutions of AgNO3 and MgCl2 are mixed, a precipitate forms. What is the correct formula for the precipitate
Answer:
AgCl
Explanation:
The reaction that takes place is:
2AgNO₃ (aq) + MgCl₂ (aq) → Mg(NO₃) (aq) + 2AgCl (s)The precipitate (meaning a solid substance) formed is silver chloride, AgCl.
All salts formed with silver and a halogen (F, Cl, Br, I) are insoluble in water, meaning that when working with aqueous solutions they will be precipitates.
which is generally more soluble in water ammonium chloride or potassium chloride explain
Answer:
Ammonium chloride
Explanation:
because is a salt which is highly soluble in water than potassium
A 3.82L balloon filled with gas is warmed from 204.9K to 304.8 K.
What is the volume of the gas after it is heated?
Given :
A 3.82L balloon filled with gas is warmed from 204.9K to 304.8 K.
To Find :
The volume of the gas after it is heated.
Solution :
Since, their is no information about pressure in the question statement let us assume that pressure is constant.
Now, we know by ideal gas equation at constant pressure :
[tex]\dfrac{V_1}{V_2} = \dfrac{T_1}{T_2}\\\\\dfrac{3.82}{V_2}= \dfrac{204.9}{304.8}\\\\V_2 = \dfrac{304.8}{204.9} \times 3.82\\\\V_2 = 5.68 \ L[/tex]
Hence, this is the required solution.
Stars composed of heavier (more massive) elements are often slightly older than stars made predominantly from hydrogen and helium. Based on your data, is the newly discovered star a younger star? Explain your answer.
Answer:
Newly discovered star is a younger star
Explanation:
The composition of the newly discovered star is Hydrogen, Lithium, Neon, Sodium, Mercury
It consists of both hydrogen and helium of which the old stars are not made up of as they are heavier than the new stars.
Considering the above fact, it can be stated that the new star is a young star.
Answer:
A newly discovered star is a younger star because the composition of the newly discovered star is Hydrogen, Lithium, Neon, Sodium, and Mercury. And also further consists of both hydrogen and helium of which the old stars are not made up of, as they are heavier than the newer stars. And by considering that fact; it can be stated that the new star is a young star.
Explanation:
I did the lab
what is the NGOs location in Nigeria
Answer:
9E , Badagry road , off marine road , apapa , Lagos State
Explanation
A Chemical Reactions Takes Place When
Answer:
A chemical Reaction Takes place when New bonds are formed between atoms to create new compounds
Explanation:
There are four signs that a chemical reaction has occurred: a change in color, a change in temperature, formation of a gas or formation of a precipitate. A precipitate is a solid that forms when two liquid solutions are mixed.
What are the effects of climate change? Answer this question integrating other topics of science.
Answer:
»Climatic change leads to malnutrition.
e.g when its cold season, osmoregulation decreases and rate of metabolism declines.
This is because the enzymes lack that optimum temperature for their catalytic activity to take place hence improper digestion.
»Leads to promotion of predation in ecosystem.
such as reptiles e.g snakes, lizards get away from shelters on cold days since they are cold blooded, hence their predators such as animals, birds increase.
Aqueous hydrochloric acid will react with solid sodium hydroxide to produce aqueous sodium chloride and liquid water . Suppose 12.8 g of hydrochloric acid is mixed with 7.0 g of sodium hydroxide. Calculate the minimum mass of hydrochloric acid that could be left over by the chemical reaction. Round your answer to significant digits.
Answer:
Mass of HCl leftover = 6.4 g
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
NaOH + HCl —> NaCl + H₂O
Next, we shall determine the masses of NaOH and HCl that reacted from the balanced equation. This can be obtained as follow:
Mass of NaOH = 23 + 16 + 1
= 40 g/mol
Mass of NaOH from the balanced equation = 1 × 40 = 40 g
Molar mass of HCl = 1 + 35.5 = 36.5 g/mol
Mass of HCl from the balanced equation = 1 × 36.5 = 36.5 g
SUMMARY:
From the balanced equation above,
40 g of NaOH reacted with 36.5 g of HCl.
Next, we shall determine the mass of HCl required to react with 7 g of NaOH. This can be obtained as follow:
From the balanced equation above,
40 g of NaOH reacted with 36.5 g of HCl.
Therefore, 7 g of NaOH will react with = (7 × 36.5)/40 = 6.4 g of HCl.
Thus, 6.4 g of HCl is required for the reaction.
Finally, we shall determine the leftover mass of HCl. This can be obtained as follow:
Mass of HCl given = 12.8 g
Mass of HCl that reacted = 6.4 g
Mass of HCl leftover =?
Mass of HCl leftover = (Mass of HCl given) – (Mass of HCl that reacted)
Mass of HCl leftover = 12.8 – 6.4
Mass of HCl leftover = 6.4 g
A solution that is able to dissolve additional solute is best described as
A. supersaturated
B. saturated
C. concentrated
unsaturated
_________
#LetsStudy
what is the molarity of 0.40 mol of NaCI dissolved in 1.6 L of solution
Answer:.25 M
Explanation: .4mol/1.6L = .25 M
Answer:
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Explanation:
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The osmotic pressure exerted by a solution is equal to the molarity multiplied by the absolute temperature and the gas constant . Suppose the osmotic pressure of a certain solution is measured to be at an absolute temperature of .
Answer:
c = π/T*R
c = 0.199M
Explanation:
Is measured to be 5.1 atm at an absolute temperature of 312. K. Write an equation that will let you calculate the molarity c of this solution. Your equation should contain only symbols. Be sure you define each symbol other than R.
The osmotic pressure of a solution, π, is defined as:
π = c*T*R
As we know osmotic pressure π = 5.1atm, T = 312K and R = 0.082atmL/molK
we can replace in the equation as follows:
π= c*T*R
c = π/T*Rc = 5.1atm/312K*0.082atmL/molK
c = 0.199M
2 A + 4 B → 2 C How many mol of B must react with excess A to produce 2 mol of C?
Answer:
4 mol B
Explanation:
Step 1: Write the balanced generic equation
2 A + 4 B → 2 C
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of B to C is 4:2.
Step 3: Calculate the moles of B needed to produce 2 moles of C
2 mol C × 4 mol B/2 mol C = 4 mol B
A 100.0 mL sample of natural water was titrated with NaOH. The titration required 14.53 mL of 0.1031 M NaOH solution to reach a light pink phenolphthalein end point.
Calculate the number of millimoles of NaOH required for the titration.
Answer:
The correct answer is 1.498.
Explanation:
Based on the given information, the volume of NaOH needed for the titration is 14.53 ml, and the concentration of NaOH given is 0.1031 M.
The volume of NaOH, that is, 14.53 ml can also be written as 14.53 × 10⁻³ L.
The concentration of NaOH, that is, 0.1031 M can also be written as 0.1031 moles/Litre.
Molarity (M) is determined as,
M = No of moles/Volume in litres
No of moles = Molarity × Litres
No of moles = 0.1031 moles/Litres × 14.53 × 10⁻³ L
No of moles = 1.498 × 10⁻³ L
Now, number of millimoles = 1.498 × 10⁻³ L × 1000 (millimoles = moles × 1000)
Number of millimoles = 1.498
The number of millimoles of NaOH required for the titration is 1.50 mmol
From the question,
We are to determine the number of millimoles of NaOH required for the titration
From the given information
The titration required 14.53 mL of 0.1031 M NaOH solution
From the formula
Number of moles = Concentration × Volume
Concentration of the NaOH = 0.1031 M
Volume of the NaOH = 14.53 mL
∴ Number of millimoles of NaOH required = 0.1031 × 14.53
Number of millimoles of NaOH required = 1.498043 mmol
Number of millimoles of NaOH required ≅ 1.50 mmol
Hence, the number of millimoles of NaOH required for the titration is 1.50 mmol
Learn more here: https://brainly.com/question/21086618
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How many grams of gas must be released from a 32.0 L sample of CO2(g) at STP to reduce the volume to 16.6 L at STP?
Answer:
30.3 g
Explanation:
At STP, 1 mol of any gas will occupy 22.4 L.
With the information above in mind, we calculate how many moles are there in 32.0 L:
32.0 L ÷ 22.4 L/mol = 1.43 molThen we calculate how many moles would there be in 16.6 L:
16.6 L ÷ 22.4 L/mol = 0.741 molThe difference in moles is:
1.43 mol - 0.741 mol = 0.689 molFinally we convert 0.689 moles of CO₂ into grams, using its molar mass:
0.689 mol * 44 g/mol = 30.3 gState whether 0.1 M solutions of each of the following salts are acidic, basic, or neutral. Explain your reasoning for each by writing a balanced net ionic equation to describe the behavior of each nonneutral salt in water: NaCN, KNO3, NH4Cl, NaHCO3, and Na3PO4.
Answer:
1) NaCN is a basic salt
2) [tex]KNO_3[/tex] is a neutral salt
3) [tex]NH_4Cl[/tex] is an acidic salt
4) [tex]NaHCO_3[/tex] is a basic salt
5) [tex]Na_3PO_4[/tex] is a neutral salt
Explanation:
Salts are formed by the combination of an acid and a base. There are 3 types of salt:
Acidic salt: It is formed by the combination of strong acid and weak base.Basic salt: It is formed by the combination of a strong base and weak acid.Neutral salt: It is formed by the combination of strong acid and strong base or weak acid and weak base.For the given salts:
1) NaCN is a basic salt as it is formed by the combination of sodium hydroxide (strong base) and HCN (weak acid). The chemical equation for the hydrolysis of salt follows:
[tex]NaCN+H_2O\rightarrow NaOH+HCN[/tex]
As NaOH is released in the solution. Thus, it is a basic salt.
2) [tex]KNO_3[/tex] is a neutral salt as it is formed by the combination of potassium hydroxide (strong base) and nitric acid (strong acid).
3) [tex]NH_4Cl[/tex] is an acidic salt as it is formed by the combination of ammonium hydroxide (weak base) and HCl (strong acid). The chemical equation for the hydrolysis of salt follows:
[tex]NH_4Cl+H_2O\rightarrow NH_4OH+HCl[/tex]
As HCl is released in the solution. Thus, it is an acidic salt.
4) [tex]NaHCO_3[/tex] is a basic salt as it is formed by the combination of sodium hydroxide (strong base) and partial dissociation of carbonic acid (weak acid). The chemical equation for the hydrolysis of salt follows:
[tex]NaHCO_3+H_2O\rightarrow NaOH+H_2CO_3[/tex]
As NaOH is released in the solution. Thus, it is a basic salt.
5) [tex]Na_3PO_4[/tex] is a neutral salt as it is formed by the combination of sodium hydroxide (strong base) and phosphoric acid (strong acid).
(c) If the student mixed 10 mL of distilled water with 10 mL of the sample, would this diluted solution have anabsorbance greater than, less than or equal to the absorbance of the original solution? Justify your answer.
Answer:
The diluted solution have an absorbance less than the original solution
Explanation:
As you can see in the graph, the absorbance of a substance is directly proportional to the concentration of the substance (Lambert-Beer law). That means a solution more concentrated than another will have an absorbannce greater than the more diluted solution.
In the problem, you are diluting the original sample by the addition of 10mL of distilled water, that means,
The diluted solution have an absorbance less than the original solutionby acid-base reaction explain why thymol is sparingly soluble in water but soluble in 1M NaOH solution
Answer:
Sulphanilic acid is insoluble in both water as well as in acid because it can not form hydrogen bonding with the water molecule. But it is soluble in aqueous mineral acid like HF,HCl,HNO3 because they are able to form a hydrogen bond with mineral acids. Was this answer helpful?
Which of the following pure copper samples contains the largest number of
atoms?
Sample A: 6.70 g
Sample B: 0.110 mol
Sample C: 7.83 x 1022 atoms
Answer:
Correct option is
D
1 g of B(s)
Larger is the number of moles, larger is the number of molecules.
As molar mass of B is lowest (=11 g), it will have larger number of moles. Hence, its 1 g will have highest number of molecules and moles.
Answer:d
Explanation:
explain what variable is?
PLEASE FAST
Answer:
an element, feature, or factor that is liable to vary or change.
Identify whether the following are dependent or independent clause
1. Because he cannot pick up our son
2. I am typing on the computer
3. They will have gone to Disney World
4. Before we arrive in Florida
Answer:
1. dependent clause
2. Independent clause
3. Independent clause
4. Dependent clause
Explanation:
In English language, there are two types of clauses (a group of words that contain subject and predicate) viz; independent clause and dependent clause.
INDEPENDENT CLAUSE is a clause that can stand alone to form a complete sentence, possessing a subject and a predicate.
On the other hand, a DEPENDENT CLAUSE cannot stand alone to form a complete and meaningful sentence, but instead depends on another sentence to make sense. It is often recognizable as they start with subordinating conjunctions such as while, because, when etc.
According to this question, the following are examples of independent and dependent clauses:
1. Because he cannot pick up our son - dependent clause
2. I am typing on the computer - independent clause
3. They will have gone to Disney World - independent clause
4. Before we arrive in Florida - dependent clause
When a liquid sample is taken from sea level to a higher elevation, what happens to the external (atmospheric) pressure on the liquid and the boiling point of the liquid
Answer:
The external atmospheric pressure decreases and so does the boiling point of the liquid.
Explanation:
We know that pressure decreases with height. Thus atmospheric pressure decreases at higher elevation.
The implication of this is that, if I take a liquid from sea level to a higher elevation, the external atmospheric pressure on the liquid will decrease and so does its boiling point.
Hence, the liquid boils at a lower temperature when placed at a higher elevation. For this reason, the boiling point of a liquid is lower on the mountain.
What happens to the Cl atom when it becomes part of a stable molecule NaCl?
Answer:
It looses an electron
Explanation:
We must remember that sodium chloride is an ionic compound. In an ionic compound, a metal is often bonded to a non metal.
The metal looses electron(s) and the nonmetal accepts electron(s). The metal forms its cation while the non metal forms its anion.
Thus an ionic compound is basically a pair of ions held by electrostatic interaction.
Thus, when chlorine becomes part of sodium chloride, it gains one electron from sodium and becomes Cl^-
express the measurement 4.22 quarts in the units of microliters
Answer:
[tex]3.99x10^6 \mu L[/tex]
Explanation:
Hello there!
In this case, for this units conversion problem, it turns out necessary to write the equivalence statement for liters and quarts as follows:
1 qt = 0.946353 L
Thus, the conversion set up turns out to be:
[tex]4.22qt*\frac{0.946353 L}{1qt} \\\\=3.99L[/tex]
Next, we convert to microliters as follows:
[tex]3.99L*\frac{1\mu L}{10^{-6}L}\\\\=3.99x10^6 \mu L[/tex]
Regards!
The graph shows a relationship between volume and temperature. Which of the following statements is true?
A.) The graph shows a directly proportional relationship between volume and temperature and represents Charles' Law.
B.) The graph shows an indirectly proportional relationship between volume and temperature and represents Boyle's Law.
C.) The graph shows an indirectly proportional relationship between volume and temperature and represents Gay-Lussac's Law.
4.) The graph indicates that when temperature is increased, volume decreases.
Answer:
The graph shows a directly proportional relationship between volume and temperature and represents Charles' Law.
Explanation:
The relation between volume and temperature is given by :
Ideal gas law, PV = nRT
Where
P is pressure
V is volume
R is gas constant
T is temperature
As volume and temperature have direct relationship. Charles law states that there is a direct relationship between volume and temperature. The correct option is (a).
Draw the structure of the major organic product isolated from the reaction of 3-hexyne with hydrogen (1 mol), Lindlar palladium.
Answer:
See explanation and image attached
Explanation:
When 1 mole of hydrogen is added to 3-hexyne, the addition occurs on the same face or side of the triple bond to yield cis-2-hexene in the presence of lindlar catalyst which prevents further hydrogenation. This is known as syn addition.
The syn addition is achieved because the hydrogen molecule is first adsorbed on the surface of the palladium metal and is subsequently attached to the same face of the triple bond in 3-hexyne as shown in the image attached to this answer.
What is the IUPAC name of the following compound?
Select one:
a. 4-methyl-3-phenyl-3-pentenoic acid
b. (Z)-3-methyl-2-phenyl-2-butenoic acid
c. 3-phenyl-2-methyl-2-penten-5-oic acid
d. 4,4-dimethyl-3-phenyl-3-butenoic acid
The image of the structure is attached in the image below.
Answer: The correct option is a.) 4-methyl-3-phenyl-3-pentenoic acid
Explanation:
Carboxylic acids are a type of functional group in organic chemistry that have the symbol '-COOH'. A suffix used for this functional group is '-oic acid'.
To name a compound, first look for the longest possible carbon chain.
As in the image attached below, the longest carbon chain has 5 carbon atoms. Thus, the prefix used will be 'pent-'
Also, a methyl substituent is present at the 4th position, a phenyl substituent is located at the 3rd position.
A double bond is also present at the 3rd position and a suffix '-ene' is used.
Hence, the IUPAC name for the given compound is 4-methyl-3-phenyl-3-pentenoic acid.
Is [Ni(CO)4] considered as coordination compounds?