Question

The. PH of 10*-3 mono acidic base if it is 1% ionised

Answer 1

we have to find the pH of 10¯³ M mono acidic base if it is 1 % ionised.

solution : molarity of mono acidic base , C = 0.001 M

degree of ionisation, α = 1% = 0.01

so concentration of [OH¯] = Cα = 0.001 × 0.01 = 10¯⁵ M

we know, [H⁺][OH¯] = 10¯¹⁴

⇒[H⁺] × 10¯⁵ = 10¯¹⁴

⇒[H⁺] = 10^-9 M

now using Arrhenius formula to find pH,

pH = -log[H⁺] = -log(10^-9) = 9

Therefore the pH of 10¯³ M mono acidic base if it is 1 % ionised, will be 9