Calculate pH of a buffer prepared by adding 10 mL of 0.10 M acetic acid to 20 mL of 0.1 M sodium acetate [ pKa (CH3COOH) = 4.74 ]
3.00
4.44
4.74
5.04
0.1 M solution of which of the following has almost unity degree of dissociation ?
Ammonium chloride
Potassium chloride
Sodium acetate
All of the above
If 20 mL of an acidic solution of pH 3 is diluted to 100 mL, the H+ ion concentration will be
1 × 10-3 M
2 × 10-3 M
2 × 10-4 M
0.02 × 10-4 M
If is the heat of reaction for
(heat of reaction at constant pressure), at constant temperature is
The number of hydroxyl ions in 10 cm3 of 0.2 M HCl solution is
5 × 10-14
3 × 109
3 × 1012
5 × 10-12
C.
3 × 1012
[H+] = 0.2 M (Given- HCl = 0.2 M)
[H+][OH-] = 10-14
[OH-] = = 5 × 10-14 M
Concentration of hydroxyl ions in 0.2 M HCl = 5 × 10-14 M
The number of moles of hydroxyl ions = 5 × 10-14 × 1000
The number of OH- in 10 cm3 =
= 3 × 1012
Solubility of Ca(OH)2 is s mol L-1. The solubility product (Ksp) under the same condition is
4s3
3s4
4s2
s3