   # An experiment in your laboratory requires 500. mL of a 0.0200 M solution of Na 2 CO 3 . You are given solid Na 2 CO 3 , distilled water, and a 500.-mL volumetric flask. Describe how to prepare the required solution. ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

#### Solutions

Chapter
Section ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 4, Problem 47PS
Textbook Problem
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## 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 of Solution

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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