   Chapter 4, Problem 65PS

Chapter
Section
Textbook Problem

In the photographic developing process, silver bromide is dissolved by adding sodium thiosulfate.AgBr(s) + 2 Na2S2O3 (aq) → Na3Ag(S2O3)2(aq) + NaBr(aq)If you want to dissolve 0.225 g of AgBr, what volume of 0.0138 M Na2S2O3, in milliliters, should be used? Silver chemistry.(a) A precipitate of AgBr formed by adding AgNO3(aq) to KBr(aq).(b) On adding Na2S2O3(aq), sodium thiosulfate, the solid AgBr dissolves.

Interpretation Introduction

Interpretation:

It should be determined that the volume of 0.0138MNa2S2O3, in milliliters, which is required to dissolve 0.225gofAgBr

Concept introduction:

Numberofmole=GivenmassofthesubstanceMolarmass

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

Balanced chemical equation for the given reaction is,

AgBr(s)+2Na2S2O3(aq)Na3Ag(S2O3)2(aq)+NaBr(aq)

The amount (moles) of AgBr  available can be calculated by using the equation.

Numberofmole=GivenmassofthesubstanceMolarmass

0.225gAgBr×1molAgBr187.77gAgBr=0.001198molAgBr

By using the stoichiometric factor calculating the amount of Na2S2O3 required based on the amount of AgBr as follows,

0.001198molAgBr×2molNa2S2O31molAgBr=0

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