Question

The pH of an aqueous solution of 0.123 M potassium nitrite, KNO₂ (aq), is .

This solution is acidic, basic or neutral?

Which of the following aqueous solutions are good buffer systems?

0.15 M nitrous acid + 0.18 M potassium nitrite

0.31 M hydrocyanic acid + 0.23 M potassium cyanide

0.26 M hydrochloric acid + 0.24 M sodium chloride

0.26 M ammonium nitrate + 0.36 M ammonia

0.20 M barium hydroxide + 0.22 M barium bromide

Which of the following aqueous solutions are good buffer systems?
.

0.26 M ammonium bromide + 0.38 M ammonia

0.11 M nitrous acid + 0.13 M sodium nitrite

0.36 M acetic acid + 0.29 M potassium acetate

0.25 M hydrobromic acid + 0.25 M sodium bromide

0.12 M sodium hypochlorite + 0.23 M hypochlorous acid

One liter of this solution could be converted into a buffer by the addition of:

(Assume that the volume remains constant as each substance is added.)

A. 0.22 mol HClO

B. 0.11 mol NaOH

C. 0.22 mol NaCl

D. 0.23 mol HNO₃

E. 0.11 mol HNO₃

An aqueous solution contains 0.27 M ammonia.

One liter of this solution could be converted into a buffer by the addition of:

(Assume that the volume remains constant as each substance is added.)

A. 0.13 mol HCl

B. 0.28 mol HCl

C. 0.13 mol KOH

D. 0.27 mol CaI₂

E. 0.28 mol NH₄I

Answer 1