The Organic Chem Lab Survival Manual: A Student's Guide to Techniques
10th Edition
ISBN: 9781118875780
Author: James W. Zubrick
Publisher: WILEY
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Question
Chapter 2, Problem 4E
Interpretation Introduction
Interpretation:
Is a 10% sodium hydroxide solution made by dissolving 10 grams of the solid in 100 mL of water, and if you should insisting to dissolve the 10 g of solid hydroxide in only 90 g of water is to be explained.
Concept Introduction:
% w/w (weight per weight) is used where the weight of each chemical is used and not the volume (example, If dissolve 10 g of fat in 90 g ethanol so the total mass of the whole solution is 100 g, then I have made a 10% w/w solution of fat).
% w/v (weight per volume) is used where a solid chemical is dissolved in liquid (example, if I dissolve 10 g of table salt, sodium chloride, to make up a total volume of 100 mL of solution then I have made a 10% w/v solution of sodium chloride)
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Part C. Solubility versus Temperature
1.
(a) Which solution(s) containing 1.0 g of salt (NaCl and NH,CI are both
considered "salts") per 5 ml. of water is (are) unsaturated and why?
2.
(a) Temperature of each solution before heating:
NaCl:
NH,Cl:
(b) Which solution(s) containing 2.4 g total of salt per 5 ml of water is (are)
saturated at room temperature and why?
3.
(a) Temperature of each solution in the hot water bath:
NaCl:
NH.CI:
(b) Which salt is least soluble at elevated temperatures?
(c) Classify the salt solutions at elevated temperatures as either saturated or
unsaturated.
NaCl:
NH.CI:
4.
(a) Did the salt solution(s) that were unsaturated at the elevated temperatures
become saturated when cooled? How do you know?
6.
Will the solubility increase or decrease?
Will more solid dissolve or be produced?
1) What is the mass (in grams) of CHEMENAI?
2) What is the freezing point of the solution, Tf?
3) What is the mass (in kilograms) of the liquid substance?
Chapter 2 Solutions
The Organic Chem Lab Survival Manual: A Student's Guide to Techniques
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