Question

If the [OH -] concentration in a carbonated beverage is 4.7 x 10-5 M, what is the pOH value?

Answer 1

the ion-product constant for water (Kw) = 1 x 10⁻¹⁴)

[H+] concentration in a carbonated beverage : 4.7 x 10⁻⁵ M

Required

the hydroxide ion concentrations [OH⁻]

Solution

Kw = [H₃O⁺] [OH⁻]

1 x 10⁻¹⁴ = 4.7 x 10⁻⁵. [OH⁻]

[OH⁻] = 1 x 10⁻¹⁴ : 4.7 x 10⁻⁵

[OH⁻] = 2.128 x 10 ⁻¹⁰