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EXPERIMENT 12 A: STANDARDIZATION OF A SODIUM …

EXPERIMENT 12 A: STANDARDIZATION OF A SODIUM hydroxide SOLUTION OBJECTIVE: SODIUM hydroxide solution of about M is prepared in order to be used in Exp 12B. The solution is then standardized, that is, its concentration is accurately determined, by titrating it against a weighed sample of known acidic salt, potassium acid phthalate. INTRODUCTION: SODIUM hydroxide is deliquescent (absorbs moisture from the atmosphere) solid. It cannot be weighed accurately. Therefore, it is not possible to prepare a standard solution of SODIUM hydroxide of accurately known concentration by weighing NaOH. A SODIUM hydroxide solution of approximate concentration ( M) is to be prepared. It is then standardized by titrating it against an accurately weighed sample of potassium acid phthalate (KHP), HOOC-C6H4-COOK , which is a primary standard acidic substance.

Sodium hydroxide solution of about 0.2 M is prepared in order to be used in Exp 12B. The solution is then standardized, that is, its concentration is accurately determined, by titrating it against a weighed sample of known acidic salt, potassium acid phthalate. INTRODUCTION: Sodium hydroxide is deliquescent (absorbs moisture from the atmosphere ...

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