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Solve the following problems while observing the proper number of significant figures. Show your solutions. Atomic Weights: H= 1.00 g/mol C = 12.00 g/mol N = 14.00 g/mol O = 16.00 g/mol Na = 23.00 g/mol CI = 35.45 g/mol Br = 79.90 g/mol Write the equilibrium reaction and the equilibrium expression of each of the following weak acid (Ka) and weak base (Kb). (4 pts each) (a) monoprotic hydroazoic acid, HN3 (b) basic ephedrine, C10H5ON (c) basic hydroxylamine, HONH2 1. 2. The sting from an ant's bite is caused by methanoic acid (HCH:02: K. = 1.78 x 104) How many milligrams of methanoic acid must be in a 2.0-L solution that has a pH of 3.6? (4 pts) 3. What is the pH of a solution of propionic acid (HC.H2O2; K = 1.3 x 106) made by dissolving 55.0 g of HC4H2O2 in a 1.5L solution? (4 pts) 4. A basic buffer solution of pH 8.1 is to be prepared. (a) Which among the given acids and their sodium salts below shall yield the best basic buffer solution? (2 pts) (b) What weights of the best acid and its salt must be dissolved to make a 1.00-L solution if the concentration of the acid is 0.50 M? (4 pts) Acid Salt K Hydroazoic acid HN NaN 1.9 x 105 Hypochlorous acid HCIO Nacio 3.0 x 10 Hypobromous acid HBro NaBro 2.5 x 10