# Analytical Chemistry

TUTORIAL 1: INTRODUCTION: ANALYTICAL CHEMISTRY

1. What is chemical analysis?

2. Differentiate between qualitative and quantitative analysis (Oct 2008, 2009, Dec 2009, Apr 2010)

3. Give 7 steps in performing any chemical analysis (Apr 2010) 4. Briefly explain how to prepare the following solutions:

a) 1.0 L 10.50 % (w/v) aqueous CH3CH2CH2OH (answer : 105 g) (Oct 2006, Oct 2007, Oct 2008)

b) 500 mL 2.0 M H2SO4 from a commercial reagent, at 90% (w/w) purity and specific gravity of 1.84. (answer : 59.18 mL) (Oct 2007)

c) 250 mL 50 ppm of AgNO3 from the solid chemical (answer : 0.0125 g) d) 500 mL 6.5% (w/v) aqueous ethanol (answer : 32.5 g)

e) 0.1 L 6.0 M H3PO4 from a commercial reagent, at 85% (w/w) purity and specific gravity of 1.69 (answer : 40.95 mL) (Oct 2008)

f)

400 mL 0.080 M of AgNO3 from the solid chemical (answer : 5.44g) +

g) 500 mL 100 ppm Ag from pure reagent solid silver nitrate (answer : 0.05 g) (Oct 2006 & Oct 2007)

6. The density of commercial concentrated HNO3 is 1.41 g/mL. The concentrated acid contains 69% (wt/wt) of pure acid. Determine:

a) the quantity in gram of pure HNO3 in 1000 mL of the concentrated HNO3(answer : 972.9 g)

b) the molarity of the commercial concentrated acid (answer : 15.44 M) c) the volume (in mL) of concentrated acid needed to prepare 500 mL 0f 2.50 M HNO 3 solution (answer : 80.96 mL)

d) How mililiters of KOH solution, prepared by dissolving 60.0 g of KOH in 100 mL of solution, are needed to prepare 450 mL of a 0.70 M solution (answer : 29.41 mL) 7. A student wishes to prepare 500 mL of 25 ppm solution of barium. Calculate: a) How many mililiters of 1000 ppm barium would be required if he/she were to prepare this by dilution? (answer : 12.5 mL)

b) If he/she were to prepare this from pure solid BaCl2.2H2O, how many grams would be required? (answer : 22.4 mg)

8. Tell how you would prepare 250 mL of a 5.00 M solution of H3PO4 from its commercial reagent (purity of 85%...

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