Question

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A mixture of formic acid and oxalic acid is heated with conc.H2SO4. The gas produced is collected and on treatment with KOH Solution. The Volume of the solution decreases by 1/6th the molar ratio of the two acids in the original mixture is

Answer 1

Total no. of of CO and CO2
= a + b + b
= a + 2b
Total no. of of CO2 = b
***** fraction of CO2 absorbed in KOH
= b/a+ 2b

According to given condition
= b/a+ 2b = 1/6

a = 4b

Ratio of molar ratio of the two acids in the original mixture
= HCOOH / H2C2O4
= 4 /1