A mixture of H 2 C 2 O 4 and KHC 2 O 4 required 50 mL of 0.1 N KMnO 4 for complete oxidation. The same mixture needs 30 mL of 0.1 M NaOH for complete neutralisation. Calculate the mole % o

Question

A mixture of H 2 ​ C 2 ​ O 4 ​ and KHC 2 ​ O 4 ​ required 50 mL of 0.1 N KMnO 4 ​ for complete oxidation. The same mixture needs 30 mL of 0.1 M NaOH for complete neutralisation. Calculate the mole % of H 2 ​ C 2 ​ O 4 ​ in the mixture. Give the sum of the digits of your answer (excluding decimal places) until you get a single digit.

TestHub · Accepted Answer

Let H 2 ​ C 2 ​ O 4 ​ = x mmol and KHC 2 ​ O 4 ​ = y mmol. NaOH: H 2 ​ C 2 ​ O 4 ​ has 2 acidic H and KHC 2 ​ O 4 ​ has 1: 2 x + y = 30 × 0.1 = 3 . KMnO 4 ​ : both oxidise with n-factor 2: 2 ( x + y ) = 50 × 0.1 = 5 , so x + y = 2.5 . Subtract: x = 0.5 mmol, y = 2.0 mmol. Mole % of H 2 ​ C 2 ​ O 4 ​ = 2.5 0.5 ​ × 100 = 20% . Sum of digits: 2 + 0 = 2 . Answer: 2.

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