Question

Calculate the hydrogen ion concentration in mol/L for solutions with the following pH values: (a) 2.42, (b) 11.21, (c) 6.96, (d) 15.00.

Answer 1

To find the hydrogen ions concentrations, we use the following formula.

`\lbrack H^+\rbrack=10^(-pH)`

(a) When pH = 2.42, we obtain the following.

`\lbrack H^+\rbrack=10^(-2.42)\approx^{}3.8*10^(-3)M`

(b) When pH = 11.21.

`\lbrack H^+\rbrack=10^(-11.21)\approx6.2*10^(-12)M`

(c) When pH = 6.96.

`\lbrack H^+\rbrack=10^(-6.96)=1.1*10^(-7)M`

(d) When pH = 15.00.

`\lbrack H^+\rbrack=10^(-15.00)=1*10^(-15)M`

Therefore, the hydrogen ion concentration for each case is

• 3.8x10^-3 M.

,

• 6.2x10^-12 M.

,

• 1.1x10^-7 M.

,

• 1x10^-15 M.