Answer:
New pH = 3.84
Explanation:
First of all we may think that if the buffer has pH 3.98 and we're adding H⁺, pH's buffer will be lower, as the [H⁺] is been increased.
Let's determine the moles of each compound:
0.23 M . 1.3L = 0.299 moles of NaBz
0.38 M . 1.3L = 0.494 moles of HBz
We add 0.058 of HCl, which is the same as 0.058 moles of H⁻
HCl → H⁺ + Cl⁻
As we add the moles of protons, these are going to react to the Bz⁻
In the buffer system we have these dissociations:
NaBz → Na⁺ + Bz⁻
HBz → H⁺ + Bz⁻
So, as we add protons, we have a new equilibrium:
Bz⁻ + H⁺ ⇄ HBz
In 0.299 0.058 0.494
Eq 0.241 - 0.552
Protons are substracted to benzoate, so the [HBz] is now higher than before. We calculate the new pH, with the Henderson Hasselbach equation
pH = pKa + log (Bz⁻/HBz)
pH = 4.20 + log (0.241 / 0.552) → 3.84
Answer:
Frying an egg is a chemical reaction. It is an example of an endothermic reaction, or one that takes in heat in order to make the reaction occur.
Explanation:
Answer:
48
Explanation:
be cuas of the degrees he sawu you and iwent ooh
Explanation:
Ethanol is an alcohol with a wide range of usage to man. It's production is desirable for the following reasons:
- It is a source of energy: ethanol burns like fossil fuels to produce clean and efficient energy for use. In some countries, automobile engines are now designed to consume ethanol instead of fossil fuels.
- It is a renewable source of energy since it is completely produced from biomass. Ethanol is desired because it can easily be replenished when depleted by consumption.
- Producing energy from ethanol is an environmental friendly process. It absorbs more carbon dioxide from the environment. Plants that are used in producing ethanol are cultivated and they act as carbon dioxide absorbers.
- Ethanol burns more cleanly and effectively thereby reducing pollution in the environment.
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