QUESTION 1 A solution of acid HA is prepared at four different concentrations: 2.0 mol L...
QUESTION 1
A solution of acid HA is prepared at four different concentrations: 2.0 mol L –1, 0.20 mol L –1, 0.020mol L –1, and 0.0020 mol L –1. Which of the four acid solutions will be least ionized?
| a. |
0.0020 mol L–1 |
|
| b. |
2.0 mol L–1 |
|
| c. |
0.20 mol L–1 |
|
| d. |
0.020 mol L |
QUESTION 2.
Which of the following best describes a buffer solution?
| a. |
The solution doesn’t change pH, even if large amounts of acid or base are added to it. |
|
| b. |
The solution resists change in pH when small amounts of acid or base are added to it. |
|
| c. |
The solution contains a conjugate acid-base pair and resists pH change when small amounts of acid and base are added to it. |
|
| d. |
The solution is composed of a weak acid and its conjugate base, and it keeps its pH constant as much as possible. |
QUESTION 3
The K sp for AgI is 8.5 x 10 –17.
The K sp for TlI (thallium iodide) is 5.5 x 10
–8.
A one litre solution contains 0.035 mol L –1 Ag
+ ion and Tl + ion.
When TlI begins to precipitate, what can be said about the extent
of precipitation of AgI?
| a. |
AgI is still precipitating. |
|
| b. |
AgI has completely precipitated. |
|
| c. |
AgI has largely precipitated. |
|
| d. |
AgI has not yet begun to precipitate. |
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QUESTION 1
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