Question

NaOH & Na2CO3 are dissolved in 200ml of solution in presence of phenolphthalein 17.5ml 0.1 N of HCl is used to titrate the solution. Methyl orange added to same solution and requires 2.5ml 0.1 N HCl calculate the normality of NaOH and Na2CO3

Answer 1

Answer:

Estimation of Na2CO3 and NaHCO3 in a mixture: Accurately weigh about 2.0 g of the mixture and prepare a solution in distilled water in a 250 ml standard flask. Slowly titrate 25 ml of this solution against standard hydrochloric acid using phenolphthalein as indicator. Repeat to concordance (Vp ml).

Explanation:

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Answer 2

Answer:

Normality of NaOH = 3/400 = 0.0075

Normality of Na2CO3 = 1/400 = 0.0025

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