Question

At what molar concentration of HCl will its aqueous solution have an [H+] to which equal contributions come from HCl and H2O.

• A. $\sqrt { 60 }$× 10–7 M
• B. $\sqrt { 50 }$ × 10–8 M
• C. $\sqrt { 40 }$ × 10–9 M
• D. $\sqrt { 30 }$× 10–8

Answer 1

Answer: (B)

$\sqrt { 50 }$ × 10–8 M

Answer 2

HCl $\longrightarrow$ H+ + Cl–

(x + x) (x)

H2O $\rightleftharpoons$ H+ + OH–

(x + x) (x)

Ionic product = Kw = (2x) (x) = 10–14

$\sqrt { 50 }$× 10–8