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How many moles of H3O+ or OH - must you add per liter of HCl solution to adjust its pH from 3.43 to 3.56?

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Assume a negligible volume change.
Best Answer
pH = 3.43, [H] = 3.7 x 10^-4 M
pH = 3.56, [H] = 2.75 x 10^-4 M
Difference = 0.95 moles/Liter and since pH went up, must have added that many moles of OH-.
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How many moles of H3O+ or OH - must you add per liter of HCl solution to adjust its pH from 3.43 to 3.56?
Assume a negligible volume change.
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