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mezya [45]
3 years ago
11

Suppose you have created a buffer solution that is 0.250 M in both benzoic acid (HC7H5O2) and potassium benzoate (KC7H5O2) and t

hat the pH of this solution is 4.65. Assuming that the buffer capacity has not been exceeded, which of the pH values listed below would you expect after adding a small amount of a dilute strong acid solution?
8.85
4.49
4.81
2.88
There is not enough information to determine.
Chemistry
1 answer:
lbvjy [14]3 years ago
7 0

Answer:

4.49

Explanation:

We have a buffer form by a weak acid (HC₇H₅O₂) and its conjugate base (C₇H₅O₂⁻). The function of a buffer is to resist abrupt changes of pH when acids or bases are added. If a small amount of a dilute strong acid solution is added, pH will slightly decrease because the acid will be partially neutralized by the basic component of the buffer.

C₇H₅O₂⁻(aq) + H⁺(aq) ⇄ HC₇H₅O₂(aq)

If the pH of the buffer was originally 4.65, a slightly inferior value like 4.49 is plausible.

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Answer:

A.

Explanation:

Manganese (Mn) is a silver-colored metal. It reacts with oxygen to form manganese oxide (MnO2), which has two oxygen atoms for every manganese atom. Which statement describes the properties of manganese oxide? It will be a gas because there are more oxygen atoms.

8 0
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A certain element x has four isotopes. 4.350% of x has a mass of 49.94605 amu. 83.79% of x has a mass of 51.94051 amu. 9.500% of
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Average atomic mass of an element is the sum of atomic mass of its isotopes multiplied by their respective percentage abundance.

There are four isotopes of element X:

1. 4.350 % with mass 49.94605 amu

2. 83.79% with mass 51.94051 amu

3. 9.5% with mass 52.94065 amu

4. 2.360% with mass 53.93888 amu

Thus, average atomic mass will be:

=49.94605(\frac{4.350}{100})+51.94051(\frac{83.79}{100})+52.95065(\frac{9.5}{100})+53.93888(\frac{2.360}{100})

Or,

Average atomic mass=2.173 amu+43.52 amu+5.029 amu+1.273 amu=51.99 amu

Therefore, average atomic mass of element X will be 51.99 amu (four significant figures)

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Answer:

Explanation:

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