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Problem 93a
A 250.0 g sample of a white solid is known to be a mixture of KNO3, BaCl2, and NaCl. When 100.0 g of this mixture is dis-solved in water and allowed to react with excess H2SO4, 67.3 g of a white precipitate is collected. When the remaining 150.0 g of the mixture is dissolved in water and allowed to react with excess AgNO3, 197.6 g of a second precipitate is collected. (a) What are the formulas of the two precipitates?
Problem 93b
(b) What is the mass of each substance in the original 250 g mixture?
- Assume that you are given a solution of an unknown acid or base. How can you tell whether the unknown substance is acidic or basic?
Problem 94
- Why do we use a double arrow to show the dissociation of a weak acid or weak base in aqueous solution?
Problem 95
Problem 96a
Write balanced ionic equations for the following reactions. (a) Aqueous perchloric acid is neutralized by aqueous calcium hydroxide.
Problem 96b
Write balanced ionic equations for the following reactions. (b) Aqueous sodium hydroxide is neutralized by aqueous acetic acid.
Problem 97a
Write balanced ionic equations for the following reactions. (a) Aqueous hydrobromic acid is neutralized by aqueous calcium hydroxide.
Problem 97b
Write balanced ionic equations for the following reactions. (b) Aqueous barium hydroxide is neutralized by aqueous nitric acid.
Problem 98a
Write balanced net ionic equations for the following reactions. (a)
Problem 98b
Write balanced net ionic equations for the following reactions. (b)
Problem 99a
Write balanced net ionic equations for the following reactions. Note that HClO3 is a strong acid. (a)
Problem 99b
Write balanced net ionic equations for the following reactions. Note that HClO3 is a strong acid. (b)
- A flask containing 450 mL of 0.500 M HBr was accidentally knocked to the floor. How many grams of K2CO3 would you need to put on the spill to neutralize the acid according to the following equation?
Problem 100
- The odor of skunks is caused by chemical compounds called thiols. These compounds, of which butanethiol (C4H10S) is a representative example, can be deodorized by reaction with household bleach (NaOCl) according to the following equation: according to the following equation? How many grams of butanethiol can be deodorized by reac-tion with 5.00 mL of 0.0985 M NaOCl?
Problem 101
- Potassium permanganate (KMnO4) reacts with oxalic acid (H2C2O4) in aqueous sulfuric acid according to the follow-ing equation: How many milliliters of a 0.250 M KMnO4 solution are needed to react completely with 3.225 g of oxalic acid?
Problem 102
- Oxalic acid, H2C2O4, is a toxic substance found in spinach leaves. What is the molarity of a solution made by dissolving 12.0 g of oxalic acid in enough water to give 400.0 mL of solution? How many milliliters of 0.100 M KOH would you need to titrate 25.0 mL of the oxalic acid solution according to the following equation?
Problem 103
Problem 104a
How many milliliters of 1.00 M KOH must be added to neutralize the following solutions? (a) A mixture of 0.240 M LiOH (25.0 mL) and 0.200 M HBr (75.0 mL)
Problem 104b
How many milliliters of 1.00 M KOH must be added to neutralize the following solutions? (b) A mixture of 0.300 M HCl (45.0 mL) and 0.250 M NaOH (10.0 mL)
Problem 105a
How many milliliters of 2.00 M HCl must be added to neutralize the following solutions? (a) A mixture of 0.160 M HNO3 (100.0 mL) and 0.100 M KOH (400.0 mL)
Problem 105b
How many milliliters of 2.00 M HCl must be added to neutralize the following solutions? (b) A mixture of 0.120 M NaOH (350.0 mL) and 0.190 M HBr (150.0 mL)
- If the following solutions are mixed, is the resulting solution acidic, basic, or neutral? (a) 65.0 mL of 0.0500 M HClO4 and 40.0 mL of 0.0750 M NaOH
Problem 107
Problem 108a
Assign oxidation numbers to each element in the following compounds. (a) NO2
Problem 108b
Assign oxidation numbers to each element in the following compounds. (b) SO3
Problem 108c
Assign oxidation numbers to each element in the following compounds. (c) COCl
Problem 108d
Assign oxidation numbers to each element in the following compounds. (d) CH2Cl2
Problem 108e
Assign oxidation numbers to each element in the following compounds. (e) KClO3
Problem 108f
Assign oxidation numbers to each element in the following compounds. (f) HNO3
Problem 109a
Assign oxidation numbers to each element in the following compounds. (a) VOCl3
Problem 109b
Assign oxidation numbers to each element in the following compounds. (b) CuSO4
Problem 109c
Assign oxidation numbers to each element in the following compounds. (c) CH2O