3 Ba(NO3)2 (aq) + Al2(SO4)3 (aq) --> 3 BaSO4 (s) + 2 Al(NO3)3 (aq)
From the equation:
3 mol Ba(NO3)2 react with 1 mol Al2(SO4)3
Mol Al2(SO4)3 25.0 mL of 0.350 M solution
Mol = 25.0 mL / 1000 mL/L ,* 0.350 mol /L = 0.00875 mol
This will require 0.00875*3 = 0.02625 mol Ba(NO3)2
The Ba(NO3)2 solution is 0.280 M
1000 mL contains 0.280 mol
Volume that contains 0.02625 mol = 0.02625 mol / 0.280 mol * 1000 mL = 93.75 mL
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