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10 Cards in this Set

  • Front
  • Back

When mixed in appropriate amounts, each of the following mixtures can produce an effective buffer solution EXCEPT

NaOH and NaF

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

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]


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?


If the Ka for HCN is 6.2 x 10-10, what is the Kb for CN-?

1.6 x 10-5

What is the net ionic equation for the aqueous reaction of nitric acid and potassium hydroxide?

H+ + OH- ® H2O

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


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.

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

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)