Chapter 16, Problem 26PS

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

Chapter
Section

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
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

The given compounds are dissolved in water and produce its constituentâ€™s ions.

Given:

NaC6H5CO2:

NaC6H5CO2 when dissolved in water will give basic solution.

The chemical equation is as follows.

NaC6H5CO2+Â H2OÂ Â â†’HC6H5CO2+Â Na++Â OH-

It produces hydroxide ions, therefore basic solution in water.

Na2HPO4

Na2HPO4 gives basic solution when dissolved in water

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