Answered: 1. The conversion of the concentrations…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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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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