molarity of

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Chapter1: Chemical Foundations
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MTY1103 ANALYTICAL CHEMISTRY - LABORATORY
PROBLEM SET 1
I. SOLUTIONS
1. Typical seawater contains 2.7g of salt (sodium chloride, NaCl) per 100mL. What is the molarity of
Nacl in the ocean?
2. Copper (II) sulfate pentahydrate, CuSO, 5 H20, has 5 moles of H20 for each mole of CuSO, in
the solid crystal. The formula mass of CuSO4 • 5 H20 is 249.68 g/mol. How many grams of CuSO4
• 5 H20 should be dissolved in a volume of 500.0 mL to make 8.00 mM Cu2*?
The dissociation equation for the given salt is CuSO4 • 5 H2O -> Cu2* + S0, + 5 H20
3. How many ml of 15.8 M nitric acid should be diluted to 0.250 L to make 3.00M HNO3?
4. Vinegar contains 5 wt% acetic acid. How many grams of vinegar are required to react with 5g
of NaHCO3? The density of vinegar is close to 1.0 g/mL. How many mL of vinegar are required to
react with 5g of NaHCO3?
The reaction of vinegar and sodium bicarbonate is given by the reaction
NaHCO3 + CH3COOH → Na* + CO2 + H2O + CH3CO
5. In a gravimetric analysis, we need enough product to weigh accurately. Each tablet provides
~15mg of iron. How many tablets should we analyze to provide 0.25 g of Fe203 product?
Transcribed Image Text:MTY1103 ANALYTICAL CHEMISTRY - LABORATORY PROBLEM SET 1 I. SOLUTIONS 1. Typical seawater contains 2.7g of salt (sodium chloride, NaCl) per 100mL. What is the molarity of Nacl in the ocean? 2. Copper (II) sulfate pentahydrate, CuSO, 5 H20, has 5 moles of H20 for each mole of CuSO, in the solid crystal. The formula mass of CuSO4 • 5 H20 is 249.68 g/mol. How many grams of CuSO4 • 5 H20 should be dissolved in a volume of 500.0 mL to make 8.00 mM Cu2*? The dissociation equation for the given salt is CuSO4 • 5 H2O -> Cu2* + S0, + 5 H20 3. How many ml of 15.8 M nitric acid should be diluted to 0.250 L to make 3.00M HNO3? 4. Vinegar contains 5 wt% acetic acid. How many grams of vinegar are required to react with 5g of NaHCO3? The density of vinegar is close to 1.0 g/mL. How many mL of vinegar are required to react with 5g of NaHCO3? The reaction of vinegar and sodium bicarbonate is given by the reaction NaHCO3 + CH3COOH → Na* + CO2 + H2O + CH3CO 5. In a gravimetric analysis, we need enough product to weigh accurately. Each tablet provides ~15mg of iron. How many tablets should we analyze to provide 0.25 g of Fe203 product?
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