Answer to Question #87321 in Inorganic Chemistry for Fadiena

Question #87321
Assuming that the sodium sulphate sample is 100% pure, calculate the volume of 0.25 M BaCL2 required to precipitate all the sulphate in it. (as in step 4 in the precipitation stage in the experiment). What is the formula use for this question ? thank you.
1
Expert's answer
2019-04-01T07:47:41-0400

 1 mol     X mol

Na2SO4 +BaCl2 = BaSO4↓ + 2NaCl

 1 mol     1 mol


n(Na2SO4) = 1 mol = 142 g/mol.

n(BaCl2) = X = 1 mol.

V(BaCl2) = n(BaCl2) / C(BaCl2) = 1 mol / 0.25 M = 4 L. 


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