Homework Help: Chemistry

Posted by Anne on Thursday, October 25, 2012 at 11:40pm.

The solubility of CaSO4 is 0.209 g/100 mL of water at 30 degrees celsius. if 0.500 g CaSO4 is stirred overnight at 30 Degrees Celsius with 100.0 mL of water,

a. How many grams of CaSO4 remain undissolved?
b. Calculate the molarity of CaSO44 in solution

Chemistry - DrBob222, Friday, October 26, 2012 at 12:19am
Solubility CaSO4 = grams/molar mass = mols in 100 mL.
Convert mols CaSO4 to g. g = mols x molar mass CaSO4.
a.
Total grams - grams dissolved = ?

b.
mols CaSO4 in 100 mL x (1000/100) = mols CaSO4 in 1 L and M = mols/L.

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