Transcript 3rd Quarter Make Up Warm Ups

QUESTION
Nitric acid, HNO3, is considered to be a strong acid whereas
nitrous acid, HNO2, is considered to be a weak acid. Which of
the statements here is fully correct?
1. Nitric acid has an aqueous equilibrium that lies far to the
right and NO3– is considered a weak conjugate base.
2. Nitric acid has a stronger conjugate base than nitrous acid.
3. The dissociation of nitrous acid compared to an equal
concentration of nitric produces more H+.
4. The equilibrium of nitrous acid lies far to the left and the
conjugate base is weaker than the conjugate base of nitric
acid.
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CRS Question, 14–4
QUESTION
Which of the following correctly compares strength of acids,
pH, and concentrations?
1. A weak acid, at the same concentration of a strong acid,
will have a lower pH.
2. A weak acid, at the same concentration of a strong acid,
will have the same pH.
3. A weak acid, at a high enough concentration more than a
strong acid, could have a lower pH than the strong acid.
4. A weak acid, at a concentration below a strong acid,
could have a lower pH than a strong acid.
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CRS Question, 14–13
QUESTION
Butyric acid is a weak acid that can be found in spoiled butter.
The compound has many uses in synthesizing other flavors.
The Ka of HC4H7O2 at typical room temperatures is 1.5  10–5.
What would be the pH of a 0.20 M solution of the acid?
1.
2.
3.
4.
5.52
4.82
2.76
–0.70
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CRS Question, 14–15
QUESTION
Two weak acids, HA and HB are placed in separate solutions so
that their molarities are the same. Which, if either, would have
the larger value for Ka if the pH of the HA solution were lower
than the pH of the HB solution?
1.
2.
3.
4.
HA has the larger Ka.
HB has the larger Ka.
The Ka of HA = Ka of HB.
My answer would actually just be a guess, does more
information need to be given?
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CRS Question, 14–19
QUESTION
The Ka value for monochloroacetic acid is 1.35  10–3 at
25°C. Neutralizing the acid with KOH would produce the
salt potassium chloroaceate. What would be the pH of a
0.110 M solution of the salt at 25°C?
1.
2.
3.
4.
7.956
13.041
6.044
12.086
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CRS Question, 14–29