Answered: 1. The conversion of the concentrations…

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter10: Solutions

Section: Chapter Questions

Problem 86QAP: A martini, weighing about 5.0 oz (142 g), contains 30.0% by mass of alcohol. About 15% of the...

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1. The conversion of the concentrations into the required expression is as follows:

Concentration	given Expression required
0.5% NaCl	molarity
1 mM of KBr	mg/ml
5 mg/100 ml paracetamol	Molarity
0.15 N H2SO4	g/litre
0.5% ethanol/water (w/v)	ppm

2. 0.641 g of a semi-synthetic alkaloid was dissolved in 25 ml of 1% w/v acetic acid and was
analysed directly by HPLC. The solution was found to contain 1.42 mg/100 ml of an impurity.
What is the level of impurity in % w/w and ppm?

3. Calculate the pH of a buffer system made by dissolving 1.2 g of acetic acid and 0.82 g of
sodium acetate in 500 ml of distilled water (pKa of acetic acid = 4.7)

0.641 g of a semi-synthetic alkaloid was dissolved in 25 ml of 1% w/v acetic acid and was
analysed directly by HPLC. The solution was found to contain 1.42 mg/100 ml of an impurity.
What is the level of impurity in % w/w and ppm?

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