What is the pH of a 0.0075 molar solution of ammonia (NH3)? given:publish =4.75.
Answer:
10.57
Explanation:
Step 1: Given and required data
Concentration of NH₃ (Cb): 0.0075 MBasic dissociation constant for NH₃ (Kb): 1.8 × 10⁻⁵Step 2: Write the basic dissociation reaction for NH₃
NH₃(aq) + H₂O(aq) ⇄ NH₄⁺(aq) + OH⁻(aq)
Step 3: Calculate the concentration of OH⁻
We will use the following expression.
[OH⁻] = √(Kb × Cb)
[OH⁻] = √(1.8 × 10⁻⁵ × 0.0075 M) = 3.7 × 10⁻⁴ M
Step 4: Calculate the concentration of H⁺
We will use the water ion product.
Kw = 1.0 × 10⁻¹⁴ = [H⁺] × [OH⁻]
[H⁺] = 1.0 × 10⁻¹⁴/3.7 × 10⁻⁴ = 2.7 × 10⁻¹¹ M
Step 5: Calculate the pH of the solution
We will use the definition of pH.
pH = -log [H⁺] = -log 2.7 × 10⁻¹¹ = 10.57
= 25 X 5 = (use the correct number of sig figs)
Answer:
1.25 *10^2
Explanation:
25*5 = 125
= 1.25 *10^2
5.
__________currents can form when liquids and gases are heated. The cold air________and the hot
air
6. Energy can travel through empty space by________Dull black surfaces are_________radiators and_______absorbers. Shiny surface are_________radiators and
absorbers of radiation.
Answer:
Explanation:
Convection
Cold air sinks
Hot air rises
Radiation
faster
better
poor
I think
Among the theories of man's state of nature,which is/are the most credible/Reasonable?,
trees... they bring life nd without trees, there wouldnt be life
Jenna notices that the speed of the wind has increased throughout the day. What is causing the faster wind?
A. There has been no precipitation.
B. The difference in air pressure has decreased.
C. The difference in air pressure has increased.
D. The direction of the wind has changed to the south.
Answer:
It is either C or D I think
Explanation:
I did the test a week ago but I can not figure out if it was C or D, but it was one of them...Hope it helps!
I think its C I'm not sure though.
Which formula represents a nonpolar molecule containing polar covalent bonds?
Answer:
Figure 2 represents a nonpolar molecule containing polar covalent bonds
Explanation:
The CO2 molecule is linear, formed by 3 atoms and the electronegativity variations are equal, so its dipolar moment will be null, and this molecule will be nonpolar, however, it has polar covalent bonds.
Ionization refers to the process of
A. changing from one period to another.
B. losing or gaining protons
C. turning lithium into fluorine.
D. losing or gaining electrons.
Answer:
B
Explanation:
Help me anyone? Thanks!!!!
One of the possible reactions for nuclear fusion involves the collision of 2 deuterium
nuclei. Complete the reaction by identifying the missing particle: 2/1H + 2/1H ——> 1/0n +?
Answer:
³₂He
Explanation:
From the question given above, the following equation was obtained
²₁H + ²₁H —> ¹₀n + __
Let ᵇₐX be the missing part of the equation. Thus, the equation becomes:
²₁H + ²₁H —> ¹₀n + ᵇₐX
Next, we shall determine b, a, and X. This can be obtained as follow:
2 + 2 = 1 + b
4 = 1 + b
Collect like terms
b = 4 – 1
b = 3
1 + 1 = 0 + a
2 = 0 + a
a = 2
ᵇₐX => ³₂X => ³₂He
Thus the equation is:
²₁H + ²₁H —> ¹₀n + ᵇₐX
²₁H + ²₁H —> ¹₀n + ³₂He
The missing part is ³₂He
If a gas is cooled from 222 K to 125 K and the volume is kept constant, what would be the final
pressure if the original pressure was 760 mmHg?
A strong beam of light is directed toward a tank filled with water. What caused the beam of light to change direction?
When light travels from less dense air to denser glass or water, it slows down. Slowing down of a ray of light changes the direction of the ray of light.
What is Ray of light?Light that travels in a straight line in one direction is called a ray of light. When a group of light emanates from a source, it is called a beam of light. A beam of light is defined as the path of a photon or a group of photons traveling through a space appearing as a column of light.
There are three types of light rays. They are
Incident raysReflected raysRefracted raysExample of a beam is a beam of light with a pass from a laser or laser pointer. A beam of light is made up of particles called photons that carry specific amounts of energy. We cannot measure the length of a beam.
Thus, when light travels from less dense air to denser glass or water, it slows down. Slowing down of a ray of light changes the direction of the ray of light.
Learn more about Ray of light, here:
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what happens when water changes from a solid to a liquid to a vapor
Answer:
It forms a water cycle!
Hope it helps!!!
How does air flow when a low-pressure center occurs in the
atmosphere?
Answer:
A
Explanation:
It is so because the low air pressure create vacuum and the air from high pressure area move toward the low air pressure.
ionization refers to the process of what
Answer:
Any process that leads to the dissociation of a neutral atom or molecule into charged particles ions; the state of being ionized.
Explanation:
How many grams are needed to make 2 L of solution of 4 M LiNO3?
Answer:
552 g of LiNO₃
Explanation:
From the question given above, the following data were obtained:
Volume of solution = 2 L
Molarity of LiNO₃ = 4 M
Mass of LiNO₃ =?
Next, we shall determine the number of mole of LiNO₃ in the solution. This can be obtained as follow:
Volume of solution = 2 L
Molarity of LiNO₃ = 4 M
Mole of LiNO₃ =?
Molarity = mole /Volume
4 = mole of LiNO₃ / 2
Cross multiply
Mole of LiNO₃ = 4 × 2
Mole of LiNO₃ = 8 moles
Finally, we shall determine the mass of of LiNO₃ needed to prepare the solution. This is can be obtained as follow:
Mole of LiNO₃ = 8 moles
Molar mass of LiNO₃ = 7 + 14 + (16×3)
= 7 + 14 + 48
= 69 g/mol
Mass of LiNO₃ =?
Mole = mass /Molar mass
8 = Molar mass of LiNO₃ /69
Cross multiply
Molar mass of LiNO₃ = 8 × 69
Molar mass of LiNO₃ = 552 g
Thus, 552 g of LiNO₃ is needed to prepare the solution.
What is the mass of 3.92 mol of calcium chloride ?
Answer: Do a quick conversion: 1 moles Calcium Chloride = 110.984 gram using the molecular weight calculator and the molar mass of CaCl2.
Explanation:
Answer:
three mole of CaCI2 have a mass of 3•molx110.98•g•mol-1=333•g
Balance the 2 chemical equation below: 1) _____H2 + _____02 ---> _____H20 2) _____CH4 + _____Cl2 ---> _____CCl4 + _____HCl Your answer:
Answer:
1.) 2H2 + O2 ---> 2H2O
2.) CH4 + 4Cl2 ---> CCl4 + 4HCl
Explanation:
In order to balance the equation, you have to make sure there are the same amount of each element on both sides.
Ex (#1). By adding the coefficients infront of H2 and H20, You now have 4 hydrogen's and 2 oxygens on the left side as well as 4 hydrogens and 2 oxygens on the right side.
Sorry if that's confusing, but hope this helps! :)
What is the final chemical equation from the following intermediate chemical equations?
2 equations. First: upper P subscript 4 upper O subscript 6 (s) right arrow upper P subscript 4 (s) plus 3 upper O subscript 2 (g). Second: upper P subscript 4 (s) plus 5 upper O subscript 2 (g) right arrow upper P subscript 4 upper O subscript 10 (s).
Upper P subscript 4 upper O subscript 6 (s) plus 2 upper O subscript 2 (g) right arrow upper P subscript 4 upper O subscript 10 (s).
Upper P subscript 4 upper O subscript 6 (s) plus 8 upper O subscript 2 (g) right arrow 2 upper P subscript 4 (s) plus upper P subscript 4 upper O subscript 10 (s).
Upper P subscript 4 upper O subscript 6 (s) plus 15 upper O subscript 2 (g) right arrow upper P subscript 4 (s) plus upper P subscript 4 upper O subscript 10 (s).
Upper P subscript 4 upper O subscript 6 (s) StartFraction 5 over 3 EndFraction upper O subscript 2 (g) right arrow upper P subscript 4 upper O subscript 10 (s).
pls hurry
Answer:
A
Explanation:
edge2021
Answer:
A.
Explanation:
Edge
An arctic weather balloon is filled with 34.1L of helium gas inside a prep shed. The temperature inside the shed is 5.°C. The balloon is then taken outside, where the temperature is â5.°C. Calculate the new volume of the balloon. You may assume the pressure on the balloon stays constant at exactly 1atm. Be sure your answer has the correct number of significant digits.
Answer:
When the balloon is taken outside if the outside temperature is lower than the temperature inside the shed, the volume of the helium gas will decrease according to Charles' law. However, if the temperatureoutside is higher than inside the shed, the volume of the helium gas in the weather balloons will increase.
Note: The question is not complete. Assumptionshas been made about the temperature.
Explanation:
According to Charles' law of gases, the volume of a given mass of gas is directly proportional to its temperature in Kelvin provided its pressure remains constant.
Mathematically, V1T1 = V2T2
Given that the volume of the helium gas inside the weather balloon is 34.1 L at a temperature of 5 °C;
When the balloon is taken outside if the outside temperature is lower than the temperature inside the shed, the volume of the helium gas will decrease according to Charles' law. However, if the temperatureoutside is higher than inside the shed, the volume of the helium gas in the weather balloons will increase.
Assuming, the temperature outside the shed was 6.5 °C:
V1 = 34.1 L, T1 = 5.°C or 5.0 × 10^-10 °C = 273.1500000005
V2 = ?, T2 = 6.5 °C 6.5 × 10^-10 °C = 273.15000000065
V2 = V1T1/T2
V2 = (34.1 × 273.1500000005) / 273.15000000065
V2 = 34.1 L
Due the very small increase in temperature, the volume of the balloon increases only very slightly that is increase that it is negligible.
which element was used by the ancient egyptians, in the form of borax, to make mummies?
Answer:
boron compound - known as Borax
Explanation:
2Na + 2H20 – 2NaOH+H2
How many Liters of water are needed if 3.7 moles of Hydrogen are available?
Answer:
0.1332 L
Explanation:
The balanced chemical equation is the following:
2 Na(s) + 2 H₂O(l) → 2 NaOH(aq) + H₂(g)
According to the equation, 2 moles of water (H₂O) produce 1 mol of hydrogen (H₂). So, the stoichiometric ratio is 1 mol H₂/2 mol H₂O. To calculate how many moles of H₂O we need to produce 3.7 moles of H₂, we multiply the moles by the stoichiometric ratio:
3.7 moles H₂ x 2 mol H₂O/1 mol H₂ = 7.4 moles H₂O
Now, we have to convert the moles of water to liters. For this, we have to consider the molecular weight (MW) of water and its density (let's consider 1.0 g/mL).
MW(H₂O) = (2 x 1 g/mol H) + 16 g/mol = 18 g/mol
7.4 moles H₂O x 18 g/mol = 133.2 g
133.2 g/(1.0 g/ml) = 133.2 mL
133.2 ml x 1 L/1000 ml = 0.1332 L
Therefore, approximately 0.13 liters of water are needed.
perspex and polythene are two examples of what?
_ Na3PO4 + _ HCl NaCl + _ H3PO4
Answer:
Na₃PO₄ + 3HCl —> 3NaCl + H₃PO₄
The coefficients are: 1, 3, 3, 1
Explanation:
_Na₃PO₄ + __HCl —> __NaCl + _H₃PO₄
The above equation can be balance as follow:
Na₃PO₄ + HCl —> NaCl + H₃PO₄
There are 3 atoms of Na on the left side and 1 atom on the right side. It can be balance by writing 3 before NaCl as shown below:
Na₃PO₄ + HCl —> 3NaCl + H₃PO₄
There are 3 atoms of Cl on the right side and 1 atom on the left side. It can be balance by writing 3 before HCl as shown below:
Na₃PO₄ + 3HCl —> 3NaCl + H₃PO₄
Now, the equation is balanced.
The coefficients are: 1, 3, 3, 1
What volume of concentrated 15M H2SO4 is required to prepare 0.75 liters of a 6.0M solution?
Answer:
30 ml
Explanation:
A sample of oxygen had an initial volume of 4.0L and was at a standard pressure of 10 atm, what would the new volume be if the pressure was increased to 25.00atm?
The new volume would be 1.6 L
How to calculate the new volume of a substance if pressure changes?The best way to calculate the volume of a substance in this situation is to use Boyle's law:
P1V1 = P2V2
In this formula, the initial pressure multiplied by the initial volume is equivalent to the second pressure multiplied by the volume.
Let's now use the values given:
P1V1 = P2V210atm x 4 L = 25atm x V2V2 = 10 atm x 4 L / 25 atmV2= 40 /25V2 = 1.6 LLearn more about Volume in: https://brainly.com/question/1578538
21 POINTS TO WHO EVER CAN ANSWER THIS
Explain why water is considered the "universal solvent".
Answer:
Explanation:
Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. And, water is called the "universal solvent" because it dissolves more substances than any other liquid. This allows the water molecule to become attracted to many other different types of molecules.
Most objects are not able to float in midair. What must be occurring for these rings to float instead of fall
Answer:
magnetic force
Explanation:
A magnet is defined as an object that can attract other objects that are made of iron. Magnets also repels or push away other magnets. Every piece of magnets have two poles namely, a south pole and a north pole. When one magnet comes near another magnet, it exerts a magnetic force on the other magnet. This force can be attractive force or repelling force depending upon the poles surface of the magnet that are close to each other.
Like pole repel each other while opposite poles attract each other.
In the context, the rings of magnet are floating in the air because there is a magnetic force that is repelling the like surfaces or the like poles of these magnetic rings.
What is the molar mass of NH4?
Answer:
96.09 grams per mole
Explanation:
The chemical formula of ammonium carbonate is (NH4)2CO3, a chemical compound with a molar mass of 96.09 grams per mole.
Sorry if its wrong! ~Kira
between 7.35 and 7.45, Which of the following best describes human
blood
Answer:
human blood is slightly basic
Explanation:
If the pH of a solution is less than 7, it is acidic. If the pH is 7, the solution is neutral and if the pH is greater than 7,the solution is basic. So human blood is slightly basic.
what are clean sources of energy
solar energy
wind energy
hydro energy
tidal energy
geothermal energy