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WorksheetspH of salts calculations
Total questions: 10
Worksheet time: 50mins
HZ is a weak acid. An aqueous solution of HZ is prepared by dissolving 0.020 mol of HZ in sufficient water to yield 1.0 L of solution. The pH of the solution was 4.93 at 25.0°C. The Ka of HZ is __________.
1.2 x 10-5
6.9 x 10-9
1.4 x 10-10
9.9 x 10-2
Determine the pH of a 0.35 M aqueous solution of CH3NH2 (methylamine). The Kb of methylamine is 4.4 x 10-4.
10.00
3.86
12.09
1.96
An aqueous solution contains 0.050 M of methylamine. The concentration of hydroxide ion in this solution is __________ M. Kb for methylamine is 4.4 x 10-4.
0.050
2.2 x 10-5
2.9 x 10-3
4.5 x 10-3
The Ka for HCN is 4.9 x 10-10. What is the value of Kb for CN-?
2.0 x 10-5
4.0 x 10-6
4.9 x 10-24
2.0 x 109
Calculate the pH of 0.726 M anilinium hydrochloride (C6H5NH3Cl) solution in water, given that Kb for aniline is 3.83 x 10-4.
1.77
12.64
5.36
8.64
Kb for NH3 is 1.8 x 10-5. What is the pH of a 0.35 M aqueous solution of NH4Cl at 25.0°C?
9.76
4.35
9.11
4.86
The Ka for formic acid (HCO2H) is 1.8 x 10-4. What is the pH of a 0.35 M aqueous solution of sodium formate (NaHCO2)?
11.64
5.42
4.26
8.64
Ka for HCN is 4.9 x 10-10. What is the pH of a 0.068 M aqueous solution of sodium cyanide?
2.96
11.07
13.24
7.00
The pH of a 0.15 M aqueous solution of NaZ (the sodium salt of HZ) is 10.7. What is the Ka for HZ?
1.6 x 10-6
6.0 x 10-9
8.9 x 10-4
1.3 x 10-12
A 0.1 M aqueous solution of __________ will have a pH of 7.0 at 25.0 °C.
NaOCl
KCl
NH4Cl
Ca(OAc)2
