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M= 20mmol 20mmol
R = 20mmol 20mmol 20mmol
___________________________________ _
S= 0 0 20mmol
M=20/200= 10^-1M
[OH^-] = √kw/ka x M
= √10⁻¹⁴/10⁻⁵ X 10⁻¹
= √10⁻¹⁰ = 10⁻⁵
POH = 5
PH = 14-5 = 9