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The minimum pH at which Co(OH)2 will precipitate is 9.14. Your task is to prevent this...

The minimum pH at which Co(OH)2 will precipitate is 9.14. Your task is to prevent this precipitation by preparing a buffer solution containing 1.00 M NH3. What is the minimum amount of (NH4)2SO4 (FW = 132.14 g/mol) that must be added to 100.0 mL of solution to prevent the precipitation of Co(OH)2 in this solution? The Kb for NH3 = 1.8 x 10-5. Report your answer in grams

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