KCET2009ChemistryIonic Equilibrium
10⁻⁶ M NaOH is diluted 100 times. The pH of the diluted base is
Options
- Abetween 7 and 8
- Bbetween 5 and 6
- Cbetween 6 and 7
- Dbetween 10 and 11
Correct answer
A. between 7 and 8
Step-by-step solution
[ OH ⁻ ] in the diluted base = 10⁻⁶ 10² =10⁻⁸ Total [ OH ⁻ ]=10⁻⁸+ [ OH ⁻ ] of water aligned &= (10⁻⁸+10⁻⁷ ) M &=10⁻⁸[1+10] M aligned aligned &=11 10⁻⁸ M pOH &=- 11 10⁻⁸ &=- 11+8 10 &=6.9586 pH &=14-6.9586 &=7.0414 aligned