The pH of a 10⁻¹⁰ M - NaOH solution is

Step-by-step solution

When the solution is very dilute, the concentration of OH ⁻ produced from water cannot be neglected. Hence, aligned & [ OH ⁻ ]=10⁻¹⁰+10⁻⁷ & (obtained from water) & =10⁻⁷(0.001+1)=1.001 10⁻⁷ & pOH =- [ OH ⁻ ] & =- (1.001 10⁻⁷ ) & =7-0.01=6.99 & pH =14- pOH & =14-6.99=7.01 & aligned