Let HA → weak acid
Equilibrium reaction: HA(aq) + H2O(l) ⇌ A-(aq) + H3O+(aq)
Solids and liquids are not included in the expression
Determine the Ka of an acid whose 0.294 M solution has a pH of 2.80.
A) 4.9 x 10-7
B ) 1.2x 10-5
C) 8.5 x 10-6
D) 5.4 10-3
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