9th Edition
Steven S. Zumdahl
ISBN: 9781133611097




9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

Solutions of sodium thiosulfate are used to dissolve unexposed AgBr (Ksp = 5.0 × 10−13) in the developing process for black-and-white film. What mass of AgBr can dissolve in 1.00 L of 0.500 M Na2S2O3? Ag+ reacts with S2O32− to form a complex ion:

Ag + ( a q ) + 2 S 2 O 3 2 ( a q ) A g ( S 2 O 3 ) 2 3 ( a q ) K = 2.9 × 10 13

Interpretation Introduction

Interpretation: The mass of AgBr that can dissolve in 1.0L of 0.500M Na2S2O3 is to be calculated.

Concept introduction: Concept introduction: Solubility is defined as the maximum amount of solute that can dissolve at a certain amount of solvent at certain temperature. The solubility product, Ksp is the equilibrium constant that is applied when salt partially dissolve in a solvent. The solubility product of dissociation of AxBy is calculated by the formula,




To determine: The mass of AgBr that can dissolve in 1.0L of 0.500M Na2S2O3 .

The concentration of AgBr is 3.625mol/L_ .


The volume of Na2S2O3 is 1.0L .

The molarity of Na2S2O3 is 0.500M .

AgBr is soluble in sodium thiosulfate.

The reactions that occur are,


Add the two equations. The final reaction is


The overall equilibrium constant for the reaction is calculated by the formula,



  • Ksp is the solubility product of AgI .
  • K is the overall formation constant.

Substitute the value of Ksp and K in the above expression.


At equilibrium, the equilibrium constant expression is expressed by the formula,



  • Ke is the equilibrium constant.

The equilibrium constant expression for the given reaction is,


The ICE table is formed.

InitialChangeEquilibrium AgBr+2S2O32Ag(S2O3)23+Br00

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