# chemistry

A solution is prepared by dissolving 25.0 g of ammonium sulfate in enough water to make 100.0 mL of stock solution. A 10.0 mL sample of this stock solution is added to50.0 mL of water. Calculate the concentration of ammonium ions and sulfate ions in the final solution.

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1. a chemist pours 20 grams of a liquid into a beaker. what is the volume of the liquid if it has a density of 2.5 grams/ml.

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2. 25 g (NH4)2SO4 in 100 mL soln.
Dilute 10 mL to 50 mL.

Concn is not 25 g x (10/50) = 5.0 g in the 50
moles (NH4)2SO4 = grams/molar mass
M = moles/L. (note: L is 0.050 from the 50 mL)
(SO4^-2) = [(NH4)2SO4]
(NH4^+) = 2 x [(NH4)2SO4]

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