   Chapter 4, Problem 47PS

Chapter
Section
Textbook Problem

An experiment in your laboratory requires 500. mL of a 0.0200 M solution of Na2CO3. You are given solid Na2CO3, distilled water, and a 500.-mL volumetric flask. Describe how to prepare the required solution.

Interpretation Introduction

Interpretation:

The preparation of 500mL of 0.0200M solution of Na2CO3 should be described.

Concept introduction:

• Concentration of solutions can be expressed in various terms; molarity is one such concentration expressing term.
• Molarity (M) of a solution is the number of gram moles of a solute present in one liter of the solution.

Molarity=MassperlitreMolecular massMolarity=W×1000m×V

Where W, V and m are the mass of solute, volume of solution and molar mass of the solute respectively.

W=m×V×M1000

• A solution containing one gram mole or 0.1 gram of solute per litre of solution is called molar solution.
Explanation

The mass of Na2CO3 required to make 500mL of 0.0200M solution can be calculated as follows,

W =m×V×M1000W =106.0g/mol×500mL×0.0200M1000 =1

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