Posted by LISA on Wednesday, December 15, 2010 at 2:30pm.
Why do you think the moles HCl and Ba(OH)2 are the same? Did you write the equation?
2HCl + Ba(OH)2 ==> BaCl2 + 2H2O
because at end point the solution is neutral, so the # of moles are the same? No ...so what do I do differently??
The solution may be neutral BUT the two reagents do not react 1:1 and we must correct for that (and the moles are not the same).
2HCl + Ba(OH)2 ==> BaCl2 + 2H2O
moles HCl = M x L = 0.500 x 0.03020 = 0.01510 (I don't know where your number came from; probably punched into the calculator wrong since the numbers are correct.).
Now convert moles HCl to moles Ba(OH)2.
moles Ba(OH)2 = moles HCl x (1 mole Ba(OH)2/2 moles HCl) = 0.01510 x (1/2) = 0.00755 moles Ba(OH)2.
M Ba(OH)2 = mols/L = 0.00755/0.025 = 0.3020 which rounds to 0.302 to three s.f.
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