Question

assay of ammonium chloride procedure,principle and calculation

Answer 1

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Answer 2

Answer:

The correct answer to this question is indirect assay method is used to measure ammonium chloride. The sample is dissolved in water and treated with a formaldehyde solution that has been previously neutralized.

Explanation:

Given - Ammonium chloride procedure.

To Find - Write the principle and calculation.

The indirect assay method is used to measure ammonium chloride. The sample is dissolved in water and treated with a formaldehyde solution that has been previously neutralized. (Methyleneimine is produced, which polymerizes into Hexamine.) As a result, HCl corresponding to NH4Cl is quantitatively liberated. The freed HCl is titrated with a standard NaOH solution using phenolphthalein as an indicator, and the appearance of a pale pink color indicates the endpoint.

Percent Purity of Ammonium Chloride =

Titre value x Equivalent wt factor x Normality of NaOH(actual)

%= ----------------------------------------------------------------------- x100

Weigh of sample x Normality of titrant (expected)

Percent Purity of Ammonium Chloride =

9.0ml x 0.005349x0.1 N x 100 /  0.1 gm x 0.1 N

So, the percentage purity of the given sample of ammonium chloride is……101%

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