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statuscvo [17]
3 years ago
6

Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the

statements using the choices. (1) A chemical system reaches equilibrium at the instant when the reactants are consumed and generated at equal rates. (2) One reactant and two or more products is a general characteristic of decomposition reactions. (3) Catalysts increase reaction rate by providing an alternate reaction pathway with a lower activation energy.
Chemistry
1 answer:
Aleks04 [339]3 years ago
8 0

Answer:

A = True

B = False

C = True.

I think this is the answer

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If the [A-]/[HA] ratio of a base/weak acid mixture changes from 10/1 to 1/10, how much does the pH change:
andreev551 [17]

Answer:

The pH changes by 2.0 if the [A-]/[HA] ratio of a base/weak acid mixture changes from 10/1 to 1/10.

Explanation:

To solve this problem we use the<em> Henderson-Hasselbach equation</em>:

  • pH = pKa + log [A⁻]/[HA]

Let's say we have a weak acid whose pKa is 7.0:

  • pH = 7.0 + log [A⁻]/[HA]

If the [A⁻]/[HA] ratio is 10/1, we're left with:

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  • pH = 7.0 + 1
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Now if the ratio is 1/10:

  • pH = 7.0 + log (1/10)
  • pH = 7.0 - 1
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The difference in pH from one case to the other is (8.0-6.0) 2.0.

<em>So the pH changes by 2.0</em> if the [A-]/[HA] ratio of a base/weak acid mixture changes from 10/1 to 1/10.

<u>Keep in mind that no matter the value of pKa, the answer to this question will be the same.</u>

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