HARDMCQ SINGLEJEE Advanced ChemistryPhysical ChemistryIonic equilibriumAchiever Section

A mixture of weak acid is 0.1 M in HCOOH a K 1.8 10 x and 0.1 M in HOCN a K 3.1 10 x Hence, [H O ] is

A.7.0 × 10–3 M✓ Correct

B.4.1 × 10–4 M

C.0.20 M

D.4.1 × 10–3 M

Explanation

In a mixture of two weak acids of comparable a K , expression to calculate total His 1 2 a 1 a 2 H K C K C x x Where 1 C and 2 C are concentration of acids 4 4 5 5 5 3 1.8 10 0.1 3.1 10 0.1 1.8 10 3.1 10 4.9 10 7 10 H >> x x x x x x x x

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