Answer:
pH = 12.20
Explanation:
Ca(OH)2 is a strong base, so it dissociates completely. A 0.08 M solution of Ca(OH)2 is 0.16 M OH-, since every mole of Ca(OH)2 has 2 OH-.
Calculate pOH using [OH-] = 0.16 M
pOH = -log(0.16) = 0.80
pH = 14 - pOH = 14 - 0.80 = 12.20
Taking into account the definition of pH and pOH, the pH of a 0.08 M solution of Ca(OH)₂ is 13.21
pHFirst of all, pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:
pH= - log [H⁺]= - log [H₃O⁺]
pOHSimilarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:
pOH= - log [OH⁻]
Relationship between pH and pOHThe following relationship can be established between pH and pOH:
pOH + pH= 14
This caseA strong base is one that dissociates completely in water, that is, it contributes the maximum number of OH- ions.
Ca(OH)₂ is a strong base that for each Ca²⁺ cation there are two OH⁻ anions and in which for each mole of Ca(OH)₂ two moles of OH⁻ are formed.
So: [OH⁻]= 2×[Ca(OH)₂]
[OH⁻]= 2×0.08 M
[OH⁻]= 0.16 M
Replacing in the definition of pOH:
pOH= - log (0.16 M)
Solving:
pOH= 0.79
Finally, considering the relationship between pH and pOH:
0.79 + pH= 14
pH= 14 - 0.79
pH= 13.21
In summary, the pH of a 0.08 M solution of Ca(OH)₂ is 13.21
Learn more about pH and pOH:
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A solution is made from 0.5 moles of sodium dichromate. If the volume of the solution is 1 Liter, what is the molarity of the solution
2 M
0.5 M
4 M
1 M
Answer:
4 M
Explanation:
See the steps and explanation in the picture
How do surface currents differ from deep ocean currents? Deepwater currents are dependent on the wind and landmasses. Deepwater currents are dependent on temperature and salinity. Deep ocean currents are affected by salinity and wind. None of the above
Answer:
surface currents are caused by winds : deep water currents are caused by difference in water density.
I guess the answer of your question is this
Answer:
Deepwater currents are dependent on temperature and salinity.
Explanation:
what part of the food chain is a mink
a: secondary consumer
b: primary consumer
c:prouducer
d:herbivore
Answer: A secondary consumers
Explanation:
They are carnivores, feeding on primary consumers. The Bobcat, Raccoon, Mink, and Bass are all secondary consumers.
(giving brainiest)
please answer correctly im failing school and these are my last points!
Answer:
i answered your other post with it
Explanation:
he image shows two air fronts moving in a region. The cold front is moving faster than the warm front.
Which will likely happen if the cold front continues to advance faster than the warm front?
Cold air will pass over the warm air, causing dry weather in the region.
Cold air will pass over the warm air, causing dry weather in the region.
Cold air will push up the warm air, resulting in heavy rainfall in the region.
Cold air will push up the warm air, resulting in heavy rainfall in the region.
Cold air will push up the warm a
Answer:
Cold air will push up the warm air, resulting in heavy rainfall in the region.
Describe the motion of molecules in these two
substances when the ice cube is placed on the
radiator.
Answer:
When in direct contact, the fast-moving molecules in the radiator collide with the slow-moving molecules in the ice cube. Kinetic energy is transferred from the molecules in the radiator to the molecules in the ice cube, causing a slowdown of the radiator molecules and an acceleration of the ice molecules.
Explanation:
Answer
when in direct contact, the fast-moving molecules in the radiator collide with the slow-moving molecules in the ice cube. Kinetic energy is transferred from the molecules in the radiator to the molecules in the ice cube, causing a slowdown of the radiator molecules and an acceleration of the ice molecules.
Explanation:
What might happen if an endocrine hormone such as thyroid hormone was controlled by positive instead of negative feedback?
Answer:
cdg I will be a little late to the party but I have to go to the store and get ❤️❤️❤️❤️❤️❤️
This molecule undergoes a substitution reaction through an SN1 pathway when warmed and stirred with HBr. Draw the two substitution products of this reaction. Show the correct stereochemistry by using wedges and dashes at all chiral centers. In part two, select the term that correctly describes the relationship between the products.
Answer:
See explanation and image attached
Explanation:
The mechanism of this reaction is shown in the image attached. The image was obtained from HomeworkLib.
The first step in the reaction is protonation and loss of -OH2. A carbocation is now created which undergoes a 1,2 hydride shift. This yields a tertiary carbocation which is more stable.
A racemic mixture of two products, major and minor are now obtained as shown.
KBr is the formula for an ionic compound. The fact that neither symbol is followed by a subscript means that there is a(an) of ions in the compound
Answer:
equal number of ions
Explanation:
They cancel each other out that's why there is none
Combustion of hydrocarbons such as octane (C_8H_18) produces carbon dioxide, a "greenhouse gas." Greenhouse gases in the Earth's atmosphere can trap the Sun's heat, raising the average temperature of the Earth. For this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.
1. Write a balanced chemical equation, including physical state symbols, for the combustion of liquid octane into gaseous carbon dioxide and gaseous water.
2. Suppose 0.330 kg of octane are burned in air at a pressure of exactly 1 atm and a temperature of 10.0 ?C. Calculate the volume of carbon dioxide gas that is produced. Round your answer to 3 significant digits.
Answer: 1. [tex]2C_8H_{18}(l)+25O_2(g)\rightarrow 16CO_2(g)+18H_2O(g)[/tex]
2. The volume of carbon dioxide gas that is produced is 537 L
Explanation:
1. Combustion is defined as the type of chemical reaction where a hydrocarbon is combusted in the presence of oxygen to give carbon dioxide and water.
The balanced reaction for combustion of octane is:
[tex]2C_8H_{18}(l)+25O_2(g)\rightarrow 16CO_2(g)+18H_2O(g)[/tex]
2.
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex] [tex]\text{Moles of octane}=\frac{0.330\times 1000g}{114.23g/mol}=2.89moles[/tex]
According to stoichiometry:
2 moles of octane produce = 16 moles of carbon dioxide
2.89 moles of octane produce = [tex]\frac{16}{2}\times 2.89=23.1moles[/tex] of carbon dioxide
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = 1 atm
V = Volume of gas = ?
n = number of moles = 23.1
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]10.0^0C=(10+273)K=283K[/tex]
[tex]V=\frac{nRT}{P}[/tex]
[tex]V=\frac{23.1\times 0.0821Latm/K mol\times 283K}{1atm}=537L[/tex]
Thus the volume of carbon dioxide gas that is produced is 537 L
Identify each of the patterns labeled in the ridge pattern diagram
Answer: The suspected and crime scene fingerprint patterns are similar which means they belong to the same individual.
Explanation:
A: Ending ridge between two lines forming a loop like structure common in both suspected and crimes scene patterns.
B: Bifurcation which includes the formation of fork like shape of the ridge.
C: Island is a dot or point like structure which is common in both patterns.
D: It includes delta which is seen in the case of loop and whorl patterns of the fingerprint in loop there is only one delta and in case of whorl there are two deltas. The delta have an island and a bifurcation in it which is common in both patterns of the fingerprints.
E: Intersection occurs when two ridges changes their directions. It is common in the two patterns.
To determine the concentration of a sodium thiosulfate solution as in this experiment, a student pipetted 25.0 mL of 0.0100 M potassium iodate (KIO3) solution into a 125 mL Erlernmeyer flask. Potassium iodide and sulfuric acid were added as in this experiment. The titration needed 15.21 mL of the sodium thiosulfate to reach the end point. What is the concentration of the sodium thiosulfate solution
Answer:
0.0986M is the concentration of the Na₂S₂O₃ solution
Explanation:
Potassium iodate, KIO₃, reacts with sodium thiosulfate, Na₂S₂O₃, as follows:
KIO₃ + 6Na₂S₂O₃ +5KI + 3H₂SO₄ → 3H₂O + 3K₂SO₄ + 3Na₂S₄O₆ + 6NaI
To solve this question we must find the moles of sodium thiosulfate that reacts as follows:
Moles KIO₃:
0.0250L * (0.0100mol / L) = 2.5x10⁻⁴moles KIO₃
Moles Na₂S₂O₃:
2.5x10⁻⁴moles KIO₃ * (6mol Na₂S₂O₃ / 1mol KIO₃) = 1.5x10⁻³ moles Na₂S₂O₃
Molar concentration:
1.5x10⁻³ moles Na₂S₂O₃ / 0.01521L =
0.0986M is the concentration of the Na₂S₂O₃ solution
How much NaCl would you dissolve and dilute to the 100.00 mL mark in a volumetric flask with DI H2O to prepare a 0.825 M sodium chloride solution?
Answer:
4.82 g
Explanation:
To solve this problem we'll use the definition of molarity:
Molarity = moles / litersWe are given the volume and concentration (keep in mind that 100mL=0.100L):
0.825 M = moles / 0.100 LNow we calculate the number of NaCl moles required:
moles = 0.0825 molThen we convert 0.0825 NaCl moles into grams, using its molar mass:
0.0825 mol * 58.44 g/mol = 4.82 gdoes anyone know the answer???
Answer:
ethyl ethernal
Explanation:
no explanation
A student pours 800.0 mL of a 3.000 molar solution of sodium hydroxide into a 2.00 liter volumetric flask and fills the flask up with water. What is the new molarity of the solution?
A) 12.00 M
B) 1.20 M
C) 14.00 M
D) 0.0750 M
help out here plzzzzzzzzzzzzz
Answer:
Chromosomes are duplicated in the "s phase" of interphase.
Predict the shape of the molecule.....
Answer:
bent
Explanation:
5. Choose the best description of a reversible reaction.
a reaction that occurs in both directions at the same time
a reaction that has used up all the reactants and has stopped
a reaction that can only proceed to the right
a reaction that can only proceed to the left
Answer:
A reaction that can only move towards the right.
Explanation:
For a reversible reaction when one of the products of the reaction is removed the reaction moves towards right hand side. More and more reactants will be converted into products. This will nullify the effect of removal of product.
Which of the following is true according the the Arrhenius theory of acids?
A strong acid increases the OH-ion concentration in an aqueous solution.
A strong acid decreases the OH-ion concentration in an aqueous solution.
O A strong acid decreases the H+ and OH-ion concentration in an aqueous
solution.
A strong acid increases the H+ ion concentration in an aqueous solution.
help Tell me the answer.
Answer:
it's easy u just have to put them in a calculator the way they are it will give you your answer atleast I think so hope this helps
Chlorination of phenol gives para product but bromination of phenol gives Ortho para product why
Answer:
here you go
Explanation:
The reaction of phenol with bromine is known as bromination of phenol. Solvent has great influence on the reaction. In different solvents, different products are obtained. The action of bromine on phenol can be explained as:
Reaction with bromine in water:—-
Reaction with bromine in water
Phenol reacts with bromine water to give 2,4,6-tribromophenol.
In water, ionisation is facilitated. Phenol gets ionised to form phenoxide ion, which is even better ortho,para-directing. Bromine also gets ionised to a larger extent to form a large number of bromonium ions. And Bromine ions are highly stabilized in ionic solvents. So the formation of strong o,p-directing group and stabilization of Br+ enhances the formation of tribromophenol.
Reaction with bromine in CS2:—-
Reaction with bromine in non-polar organic solvents
Phenol reacts with bromine in a presence of Carbon disulphide to form a mixture of o-bromophenol and p-bromophenol. Among which p-bromophenol predominates. In CS2 ionisation is not facilitated that much. As it is a non-polar solvent it doesn't the Br+ on. Also −OH group is moderately o,p-directing. So as usual para-product is more formed.
How many molecules of CO2 at standard temperature and pressure in 5.4 moles of CO2
Answer:
3.25×10²⁴ molecules.
Explanation:
From the question given above, the following data were obtained:
Number of mole of CO₂ = 5.4 moles
Number of molecules of CO₂ =?
The number of molecules of CO₂ in 5.4 moles can be obtained as follow:
From Avogadro's hypothesis,
1 mole of CO₂ = 6.02×10²³ molecules
Therefore,
5.4 moles of CO₂ = 5.4 × 6.02×10²³
5.4 moles of CO₂ = 3.25×10²⁴ molecules
Thus, 5.4 moles of CO₂ contains 3.25×10²⁴ molecules.
What heats up faster but loses heat faster?
-Water
-Air
Or
Land
A 5.00 g piece of metal is heated to 100.0 C then placed in a beaker containing 20.0 g of water at 10.0 C. The temperature of the water rises to 15.0 C. Calculate the specific heat of the metal
Is that flirting? I'm not sure and I really need to know-
Answer:
I mean ig it is, but i dk
Explanation:
Which of the following compounds is the most stable?
Answer:
Hey mate......
Explanation:
This is ur answer......
fluoridesThus, fluorides are the most stable while iodides are the least stable.
Hope it helps!
Mark me brainliest pls.....
Follow me! :)
Answer:
LICI
Explanation:
a p e x :)
does water burn? for my sister that says water does burn
Answer:
No, water doesn't burn. It only can burn under specific conditions in a lab.
Explanation:
Ammonia and oxygen react to form nitrogen monoxide and water, like this:
Also, a chemist finds that at a certain temperature the equilibrium mixture of ammonia, oxygen, nitrogen monoxide, and water has the following composition:
Compound pressure at equilibrium
NH_3 65.3 atm
O_2 7.79 atm
NO 12.1 atm
H_2O 65.8 atm
calculate the value of the equilibrium constant Kp for this reaction. Round your answer to 2 significant figures.
Kp=
Answer: The value of the equilibrium constant Kp for this reaction is [tex]3.3\times 10^3[/tex]
Explanation:
Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. It is expressed as K
For the given balanced chemical reaction:
[tex]4NH_3(g)+5O_2(g)\rightarrow 4NO(g)+6H_2O(g)[/tex]
The expression for [tex]K_p[/tex] is written as:
[tex]K_p=\frac{[p_{NO}]^4\times [p_{H_2O}]^6}{[p_{NH_3}]^4\times [p_{O_2}]^5}[/tex]
[tex]K_p=\frac{(12.1)^4\times (65.8)^6}{(65.3)^4\times (7.79)^5}[/tex]
[tex]K_p=3.3\times 10^3[/tex]
The value of the equilibrium constant Kp for this reaction is [tex]3.3\times 10^3[/tex]
What is the concentration of kl solution if 20.68g of solute was added to enough water to form 100ml solution?
Answer:
1.25 M
Explanation:
Step 1: Given data
Mass of KI (solute): 20.68 g
Volume of the solution: 100 mL (0.100 L)
Step 2: Calculate the moles of solute
The molar mass of KI is 166.00 g/mol.
20.68 g × 1 mol/166.00 g = 0.1246 mol
Step 3: Calculate the molar concentration of KI
Molarity is equal to the moles of solute divided by the liters of solution.
M = 0.1246 mol/0.100 L= 1.25 M
help me with this question?!!
Answer:
Glow sticks and match would be light emission, slime would be preciptate, and cookies would be gas.
Explanation: