Posted by kenny on Thursday, November 29, 2012 at 8:35pm.
pH = -log(H^+)
-2.2 = log(H^+) and
(H^+) = 0.00631 M
molsl H^+ = M x L = 0.00631 x 1.25 L = aboaut 0.008 but you need to that more accurately.
Al(OH)3 + 3HCl = AlCl3 + 3H2O
mols HCl = about 0.008
Convert mols HCl to mols Al(OH)3 using the coefficients in the balanced equation. That will give you 0.008 x 1/3 = mols Al(OH)3.
Convert that to grams. g = mols x molar mass.
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