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Calculate the pH of a buffer solution that is obtained when 1.727 mL of 3.0 M...

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Chemistry

Calculate the pH of a buffer solution that is obtained when1.727 mL of 3.0 M HCl are added to a 48.273 mL of aqueous solutionin which 0.727 g of Tris base has been dissolved. The allowed erroris 0.02 pH units.

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4.4 Ratings (793 Votes)

no of mole of tris base = W/G.M.Wt

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 0.727/121 = 0.006moles

no of moles of HClÂ Â = molarity* volume in L

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 3*0.001727= 0.005181moles

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â tris base + HCl --------> tris salt

IÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.006Â Â Â Â Â Â Â 0.00518Â Â Â Â Â Â Â Â Â Â 0

CÂ Â Â Â Â Â Â Â Â Â Â -0.00518Â Â Â Â -0.00518Â Â Â Â Â Â Â Â 0.00518

EÂ Â Â Â Â Â Â Â Â Â Â Â Â 0.00082Â Â Â Â Â Â Â 0Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.00518

Â Â Â Â POH = pkb +log[tris salt]/[tris base]

Â Â Â Â Â Â Â Â Â Â Â Â = 5.92 + log0.00518/0.00082

Â Â Â Â Â Â Â Â Â Â Â Â = 5.92 + 0.8 = 6.72

PHÂ Â Â = 14-POH

Â Â Â Â Â Â Â Â Â Â = 14-6.72 = 7.28 >>answer

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