Problem: 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 E) 27

FREE Expert Solution

Let HA → weak acid


Equilibrium reaction:        HA(aq) + H2O(l)  A-(aq) + H3O+(aq)



Ka=productsreactantsKa=A-H3O+HA

Solids and liquids are not included in the expression

Ka=xx0.294-xKa=x20.294-x

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Problem Details

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 

E) 27

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