Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
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Chapter A1, Problem A1.7QAP
Interpretation Introduction
Interpretation:
The relative error in the results due to this systematic error if the sample taken for analysis weighed
Concept introduction:
Solubility is the property of the substance by virtue of which a substance is able to dissolve with other substance which can be of the same state or can be in a different state. Solubility loss depends on the properties of the two substances to be mixed including solubility.
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The solubility of borax, which is made up of sodium tetraborate (Na2B4O5(OH)4 8H2O), was analyzed. The dissolution of borax is:
Na2B4O5(OH)4 • 8H2O(s) ⇌ 2 Na+(aq) + B4O5(OH)42–(aq) + 8 H2O(l)
A 50 mL saturated solution was prepared. After filtration of solution, 5 mL aliquot was transferred to a flask and titrated using 0.432 M HCl. The endpoint was found to be 4.73 mL of the titrant.
Tetraborate anion (B4O5(OH)42-) is a weak base which reacts with HCl like the following reaction:
B4O5(OH)42–(aq) + 2 H+(aq) + 3 H2O(l) ⇌ 4 H3BO3(aq)
What is Ksp expression for the dissolution?
What is the tetraborate ions concentration in the filtrate?
What is the molar solubility and Ksp of borax if the titration was done at room temperature (298 K)?
As part of the analysis of water samples, the hardness of water is commonly measured and calculated. It is commonly expressed in ppm by mass (parts per million) of CaCO3. Parts per million is also equivalent to milligrams of CACO3 per liter of water. In a sample taken by an environmentalist, he was able to observe a hardness count of 205 mg CacO3/L. Given this hardness count of the sample, what is the molar concentration of Ca2+ ions in the water sample?
Calculate the solubility (in g/L) of Aluminum sulfide (Al2S3) at 25°C
{Ksp for Al2S3 is 1.5x10^-27}.
1) in pure water
2) in 0.10 M H2S solution and in 0.25M Al^+3 solution
Chapter A1 Solutions
Principles of Instrumental Analysis
Ch. A1 - Prob. A1.1QAPCh. A1 - Prob. A1.2QAPCh. A1 - Prob. A1.3QAPCh. A1 - Prob. A1.4QAPCh. A1 - Prob. A1.5QAPCh. A1 - Prob. A1.6QAPCh. A1 - Prob. A1.7QAPCh. A1 - Prob. A1.8QAPCh. A1 - Prob. A1.9QAPCh. A1 - Prob. A1.10QAP
Ch. A1 - Prob. A1.11QAPCh. A1 - Prob. A1.12QAPCh. A1 - Prob. A1.13QAPCh. A1 - Prob. A1.14QAPCh. A1 - Prob. A1.15QAPCh. A1 - Prob. A1.16QAPCh. A1 - Prob. A1.17QAPCh. A1 - Prob. A1.18QAPCh. A1 - Prob. A1.19QAPCh. A1 - Prob. A1.20QAPCh. A1 - Prob. A1.21QAPCh. A1 - Prob. A1.22QAPCh. A1 - Prob. A1.23QAPCh. A1 - Prob. A1.24QAP
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