Calculate the p H of solution when 100 m L , 0.1 M C H 3 C O O H and 100 m L , 0.1 M H C O O H are mixed together. (Given: K a C H 3 C O O H = 2 × 10 – 5 , K a H C O O H = 6 × 1 0 – 5 )

Question

Calculate the p H of solution when 100 m L , 0.1 M C H 3 C O O H and 100 m L , 0.1 M H C O O H are mixed together. (Given: K a C H 3 C O O H = 2 × 10 – 5 , K a H C O O H = 6 × 1 0 – 5 ),

MARKS App · Accepted Answer

As the volume is doubled, concentration would be half. The total H + is obtained by addition of H + from both acids. [ H + ⁡ ] = K a 1 C 1 + K a 2 C 2 = 2 × 1 0 - 5 × 0.1 2 + 6 × 1 0 - 5 × 0.1 2 = 2 × 1 0 - 3 p H = 2.7

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