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Concept explainers
(a)
Interpretation:
The mass of Benzoic acid to prepare
Mass of the solute in molar solution:
The preparation of known concentration solution done by the calculated mass of solute is dissolved in required value solution.
The mass of the solute is calculated by using below equation,
(a)
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Answer to Problem 2.23P
The mass of Benzoic acid to prepare
Explanation of Solution
To calculate the mass of Benzoic acid to prepare
Given,
Molar mas of Benzoic acid is
Density of Benzoic acid is
The concentration to be prepare
The mass of Benzoic acid to
Hence,
The mass of Benzoic acid to prepare
(b)
Interpretation:
The true mass of Benzoic acid should 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,
Where,
(b)
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Answer to Problem 2.23P
The true mass of Benzoic acid is
Explanation of Solution
To calculate the true mass of Benzoic acid.
Given,
The density of Benzoic acid near
Benzoic acid mass in air is
Air density is
The give values are plugged in above equation to give a true mass of Benzoic acid.
The true mass of Benzoic acid is
The true mass of Benzoic acid was calculated.
(c)
Interpretation:
The preparation of
Concept introduction:
Serial dilation:
Serial dilation is the process, which is used to prepare a very low concentration solutions from high concentration solutions by continues step dilution method.
The Serial dilation is carried out by using volumetric principle.
Where,
(c)
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Answer to Problem 2.23P
Explanation of Solution
To explain the preparation of
Stock solution preparation:
Molar mas of Benzoic acid is
The concentration to be prepare
The mass of Benzoic acid to
Hence,
First dilution:
5 mL of stock solution is diluted in
Second dilution:
5 mL of first dilution solution is diluted in
The preparation of
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Chapter 2 Solutions
Quantitative Chemical Analysis
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