Chapter 4.9, Problem 3.1ACP

Interpretation Introduction

Interpretation:

The chloride ion concentration in a given sample of sea water has to be determined.

Concept introduction:

• The relation between the number of moles and mass of the substance is ,

     $Numberofmole=\frac{Massingram}{Molarmass}$

     $Massingramofthesubs\tan ce=Numberofmole\times Molarmass$

• 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.
• $\text{Concentration}\text{of}\text{substance}\text{=}\frac{\text{Amount}\text{of substance}}{\text{volume}\text{of}\text{the}\text{substance}}$
• $\text{Amount}\text{of substance}=\text{Concentration}\text{of}\text{substance}\times \text{volume}\text{of}\text{the}\text{substance}$
• 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.
• Mohr method is a common method used to analyze a solution for its chloride ion content. In this method a solution containing chloride ions is titrated with standardized silver nitrate and the following reaction will occur,

     $A{g}_{(aq)}{}^{+}+C{l}_{(aq)}{}^{-}\to AgC{l}_{(s)}$