Chemistry · Ionization of water, pH scale, common ion effect, hydrolysis of salts and pH of their solutions, the solubility of sparingly soluble salts, solubility products and buffer solutions
Maximum change in is observed when 50 of solution is added to
Maximum change in \( p H \) is observed when 50 of \( 1 M K O H \) solution is added to
- A. 25 ml. of \( 2.5 N \) HCl
- B. \( 50 \mathrm{ml} \) of \( 1 \mathrm{N} \) HCl
- C. \( 30 \mathrm{ml} \) of \( 2 \mathrm{N} \) HCl
- D. \( 50 \mathrm{ml} \) distilled water
Step-by-step solution
The change in pH is maximum when a strong base is added to a strong acid of equal concentration and volume, leading to complete neutralization. Option B involves 50 mL of 1 N HCl (1 M) and 50 mL of 1 M KOH, resulting in exact neutralization and a pH jump from approximately 0 (initial) to 7 (final), a change of 7 units. Options A and C leave excess acid, giving smaller pH changes. Option D, distilled water, yields a pH change from 7 to about 13.7, a change of about 6.7 units, which is less than 7.
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