   Chapter 4, Problem 123IL

Chapter
Section
Textbook Problem

Oyster beds in the oceans require chloride ions for growth. The minimum concentration is 8 mg/L (8 parts per million). To analyze for the amount of chloride ion in a 50.0-mL sample of water, you add a few drops of aqueous potassium chromate and then titrate the sample with 25.60 mL of 0.001036 M silver nitrate. The silver nitrate reacts with chloride ion, and, when the ion is completely removed, the silver nitrate reacts with potassium chromate to give a red precipitate. (a) Write a balanced net ionic equation for the reaction of silver nitrate with chloride ions. (b) Write a complete balanced equation and a net ionic equation for the reaction of silver nitrate with potassium chromate, indicating whether each compound is water-soluble or not. (c) What is the concentration of chloride ions in the sample? Is it sufficient to promote oyster growth?

(a)

Interpretation Introduction

Interpretation:

Balanced net ionic equation for the reaction of silver nitrate with chloride ions has to be written.

Concept introduction:

• For chemical reaction balanced chemical reaction equation written in accordance with the Law of conservation of mass.
• Law of conservation of mass states that for a reaction total mass of the reactant and product must be equal.
Explanation

Balanced chemical equation for the reaction of silver nitrate with chloride ions is,

Ag(aq)++Cl

(b)

Interpretation Introduction

Interpretation:

The complete balanced equation and net ionic equation for the reaction of silver nitrate with potassium chromate has to be written.

Concept Introduction:

• For chemical reaction balanced chemical reaction equation written in accordance with the Law of conservation of mass.
• Law of conservation of mass states that for a reaction total mass of the reactant and product must be equal.

(c)

Interpretation Introduction

Interpretation:

The concentration of chloride ions in the sample has to be determined and whether it is sufficient to promote oyster growth has to be ascertained.

Concept Introduction:

The molar mass of an element or compound is the mass in grams of 1 mole of that substance, and it is expressed in the unit of grams per mol (g/mol).

Stoichiometric factor is a relationship between reactant and product which is obtained from the balanced chemical equation for a particular reaction.

Concentrationofsubstance=Amountof substancevolumeofthesubstance

Titration is a method to determine the concentration of a substance in solution by adding a solution of known volume and concentration until the reaction is completed.

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