Hclo is a weak acid and so the salt
Asked by maham237 @ in Chemistry viewed by 282 People
Hclo is a weak acid (ka = 4.0 × 10–8) and so the salt naclo acts as a weak base. what is the ph of a solution that is 0.057 m in naclo at 25 °c?
Answered by maham237 @
Chemical reaction 1:
NaClO(aq) → Na⁺(aq) + ClO⁻(aq).
Chemical reaction 2: ClO⁻(aq) + H₂O(l) ⇄ HClO(aq)+ OH⁻(aq).
c(NaClO) = 0,057 M.
[ClO⁻] = 0,057 M - x.
Ka(HClO) = 4·10⁻⁸.
Ka · Kb = 10⁻¹⁴.
Kb(ClO⁻) =
2,5·10⁻⁷.
Kb(ClO⁻) = [OH⁻] · [HClO] / [ClO⁻].
[OH⁻] = [HClO] = x.
2,5·10⁻⁷ = x² / (0,057 M -x).
x = [OH⁻] = 0.00012 M.
pOH = -log(0.00012 M) = 3.92.
pH = 14 - 3.92.
pH = 10.08.
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