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10 Cards in this Set
- Front
- Back
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When mixed in appropriate amounts, each of the following mixtures can produce an effective buffer solution EXCEPT |
NaOH and NaF |
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Which of the following combinations of acids and conjugate bases would be the best to create a pH = 7.0 buffer? |
H2PO4- (Ka = 6.2 x 10-8) and HPO4-2 |
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Calculate the pH of a buffer solution prepared by dissolving 0.20 mole of cyanic acid (HCNO) and 0.80 mole of sodium cyanate (NaCNO) in enough water to make 1.0 liter of solution. [Ka(HCNO) = 2.0 x 10-4] |
4.30 |
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The Ka of hypochlorous acid, HClO, is 3.5 x 10-8. What [ClO-]/[HOClO] ratio is necessary to make a buffer of 7.71? |
1.8 |
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If the Ka for HCN is 6.2 x 10-10, what is the Kb for CN-? |
1.6 x 10-5 |
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What is the net ionic equation for the aqueous reaction of nitric acid and potassium hydroxide? |
H+ + OH- ® H2O |
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50.00 mL of 0.10 M HNO2 (nitrous acid, Ka = 4.5 x 10-4) is titrated with a 0.10 M KOH solution. After 25.00 mL of the KOH solution is added, the pH in the titration flask will be |
3.35 |
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Which one of the following conditions is always true for a titration of a weak acid with a strong base? |
The equivalence point occurs at a pH greater than 7. |
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A 30.00 mL sample of vinegar is titrated with 0.4190 M NaOH(aq). If the titration requires 27.83 mL of NaOH(aq), what is the concentration of acetic acid in the vinegar? |
0.3887 M |
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What is the pH of the solution that results from mixing 75 mL of 0.50 M NH3(aq) and 75 mL of 0.50 HCl(aq) at 25 xC? (Kb for NH3 = 1.8 x 10–5) |
4.93 |
