Quantitative Chemical Analysis 9e And Sapling Advanced Single Course For Analytical Chemistry (access Card)
Quantitative Chemical Analysis 9e And Sapling Advanced Single Course For Analytical Chemistry (access Card)
9th Edition
ISBN: 9781319090241
Author: Daniel C. Harris, Sapling Learning
Publisher: W. H. Freeman
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Chapter 2, Problem 2.27P
Interpretation Introduction

Interpretation:

The required mass of KNO3 to prepare 500mL of 1.000 M at 20°C solution should be determined.

Concept introduction:

Correction for thermal expansion:

The temperature changes are make a changes in concentration (molarity) of the solutions and this concentration change at given temperature is calculated by mathematical method is known as correction for thermal expansion.

c'd' =cd

Where,

c' is concentration of solution at temperature.

d' is density of solution at temperature.

c is concentration of solution at apply temperature.

d is the density of solution at apply temperature.

Interpretation Introduction

Interpretation:

The apparent mass of KNO3 at 20°C has to be calculated.

Concept introduction:

Buoyancy Correction:

The weight of the object in air is less then weight of the object in vacuum because of buoyancy, this weight variation is corrected using Buoyancy equation it is,

m=m'(1-dadw)(1-dad)

Where,

m is mass of object in vacuum.

m' is mass of object in air (read on a balance).

da is the density of air (0.001 2 g/mL near I bar and 25°C) .

dw is the density of calibration weights (8.0 g/mL) .

d is the density of the object being weighed.

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