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Worksheetsionic equilibria chem race
Total questions: 8
Worksheet time: 4mins
The pH value of a solution of NaOH 2.50x10-3 M is
2.60
4.50
11.40
12.30
The Kb values of the following bases are
C6H7O6- Kb = 1.3x10-10
C2H5NH2 Kb = 5.6x10-4
C5H5N Kb = 1.7x10-9
Choose the arrangement of the conjugate acids of the above bases in order of increasing acidity.
C6H7O6H < C5H5NH+ < C2H5NH3+
C5H5NH+ < C2H5NH3+ < C6H7O6H
C6H7O6H < C2H5NH3+ < C5H5NH+
C2H5NH3+ < C5H5NH+ < C6H7O6H
The pH of a 0.02 M solution of an unknown weak acid is 3.7. what is the pKa of this acid?
4.9
5.7
3.2
2.8
What is the pH of an 1.2 M HF solution?
Ka = 6.6 x 10-4 moldm-3
3.10
1.62
1.55
3.25
What is the approximate pH of a solution labeled 6 x 10-5 M HBr?
4.2
4.5
5.8
9.8
What is the pH of 500 mL of solution containing 0.0124 grams of Ca(OH)2 ? (RMM = 74)
3.8
10.2
3.2
10.8
The pH of a 0.02 M solution of an unknown weak acid is 3.7. what is the pKa of this acid?
4.9
5.7
3.2
2.8
The pH of a 0.0150 mol dm-3 solution of pyruvic acid at 25oC is (a) (pKa = 2.39)
