12. Решение задачки по химии №23

55. A 5.00 ml sample of formaldehyde solution was diluted to 100.0 ml. Sodium sulfite was added to a 5.00 ml aliquot of the solution; the hydroxide ions formed as a result of the reaction: HCOH SO32- H2O=CH2(OH)SO3- OH were titrated with 22.45 0.1000 N (feq=1/2) H2SO4 solution. Calculate the concentration of CH2O (g/l) in the original solution.

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