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1.)What is the pH of a buffer system prepared by dissolving 10.70 grams of NH4Cl and...

1.)What is the pH of a buffer system prepared by dissolving 10.70 grams of NH4Cl and 25mL of 12 M NH3 in enough water to make 1.00L of solution? Kb=1.80x10-5 for NH3. Calculate the change in pH after addition of 50.0mL of 0.15M NaOH.

2.)What mass of Na2SO4 (molar mass=142.0 g/mol) must be added to 350mL of 0.16M Ag+ to initiate precipitation of Ag2SO4? The Ksp of Ag2SO4 is 1.2x10-5. Assume no volume change occurs upon addition of Na2SO4.

3.)What is the pH of a sturated solution of Fe(OH)2? Ksp=4.87x10-17.

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