# Example-1

Example-1
Up to what pH must a solution containing a precipitate of  be adjusted so that all of precipitate dissolves (when
1. Up to 4.4
2. Up to 4.1
3. Up to 4.2
4. Up to 4.0
Solution (D)

pH = 14 â€“ 11.25 = 2.27

# Example-2

Example-2
According to Bronstedâ€“Lowry concept, the correct order of relative strength of bases follows the order:
Solution (C)
Relative strength of bases can be shown by their conjugated acids.

Conjugate acid of  is , which is a weak acid. Conjugate acid of  is , which is stronger than . Conjugate acid of  is  which is strongest out of these. So the order of relative strength of bases is .

# Example-3

Example-3
The solubility product constant Ksp of  is  If a solution is  with respect to  ion, what is the maximum hydroxide ion concentration which could be present without causing the precipitation of ?
Solution (D)

mol/L

# Example-4

Example-4
Which of the following solutions will have pH close to 1.0?
1.  of  of
2.  of  of
3.  of  of
4.  of  of
Solution (D)
Molar equivalent of

Molar equivalent of

Total number of eq.

Total volume = 100

Normality M

# Example-5

Example-5
The pH of 0.1 M solution of the following salts increases in the order
Solution (B)
HCl is a strong acid. In its 0.1 M solution,  and hence,

hydrolyzes in solution and give acidic solution which is less acidic than 0.1 M HCl. NaCl is not hydrolyzed in aqueous solutions. Its . NaCN undergoes hydrolysis in solution to give alkaline solution. So the  increases in the order, .