   Chapter 16, Problem 26PS

Chapter
Section
Textbook Problem

Which of the following common food additives gives a basic solution when dissolved in water? (a) NaNO3 (used as a meat preservative) (b) NaC6H5CO2(Sodium benzoate, used as a soft drink preservative) (c) NaH2PO4(used as a emulsifier in the manufacture of pasteurized cheese)

Interpretation Introduction

Interpretation:

The compound when gives basic solution when dissolves in water has to be identified.

Concept introduction:

The pH is a logarithmic scale used to specify the acidity or basicity of an aqueous solution.

The expression for pH is,

pH=log[H+]

The pH varies from 0 to 14 for an aqueous solution.

pH=7(Neutral)pH>7(Basic)pH<7(Acidic)

The value of pOH is a measure of hydroxide ion concentration while pH is a measure of hydronium ion concentration. The expression for pOH is,

pOH=log[OH]

The sum of pH and pOH is equal to 14 at 25°C.

pH+pOH=14

A chemical added to a particular food for a particular reason during processing or storage which could affect the characteristics of the food, or become part of the food.

Explanation

Reason for correct answers:

The given compounds are dissolved in water and produce its constituent’s ions.

Given:

NaC6H5CO2:

NaC6H5CO2 when dissolved in water will give basic solution.

The chemical equation is as follows.

NaC6H5CO2+ H2O  HC6H5CO2+ Na++ OH-

It produces hydroxide ions, therefore basic solution in water.

Na2HPO4

Na2HPO4 gives basic solution when dissolved in water

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