   Chapter 13, Problem 96SCQ

Chapter
Section
Textbook Problem

A 100.-gram sample of sodium chloride (NaCl) is added to 100. mL of water at 0 °C. After equilibrium is reached, about 64 g of solid remains undissolved. Describe the equilibrium that exists in this system at the particulate level.

Interpretation Introduction

Interpretation: the equilibrium that exist between 100g of sodium chloride in 100mL of water is to be explained if the 64g of solid remains undissolved.

Concept introduction:

Saturated solutions are reached a point in which addition of solute after this point will remain as a solid at the bottom.

At saturated solution, the process of dissolving and re-precipitating are equal at particulate level, so no change in the concentration of ions is occurred at macroscopic level.

Explanation

At equilibrium, 64g of solid NaCl is remains undissolved in the solution, so 36g of solid is dissociated into ions and they are soluble in the solution. The process of dissolving and re-precipitating are equal at particulate level

Therefore,

The equilibrium exist between solid sodium chloride and its ions is,

N

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