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Titrations –the calculations

Titrations –the calculations. You know: The volume and concentration of one solution The volume of the second solution The equation for the reaction. Moving from unknown to known. Calculate the number of moles of solute in the known solution using c = n/v

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Titrations –the calculations

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  1. Titrations –the calculations • You know: • The volume and concentration of one solution • The volume of the second solution • The equation for the reaction 12 Chemistry 2.2 quantitative chemistry CR 07

  2. Moving from unknown to known • Calculate the number of moles of solute in the known solution using c = n/v • Use the balanced equation to find the number of moles of unknown solution • Use the volume of the unknown solution to calculate concentration 12 Chemistry 2.2 quantitative chemistry CR 07

  3. Worked example • A standard solution of 1M HCl • is titrated against a solution of • NaOH of unknown concentration • 20mL aliquots of NaOH are used • and the average titre is 22.3 mL 12 Chemistry 2.2 quantitative chemistry CR 07

  4. HCl + NaOH  NaCl + H2O 1 : 1 ratio no unit n molL-1 molL-1 c v 12 Chemistry 2.2 quantitative chemistry CR 07

  5. Information • c (HCl) = 1 molL-1 • v (HCl) = 22.3 mL = o.o223 L • n (HCl) = cxv = 1 x 0.0223 • = 0.0223 mol • n (HCl) = n (NaOH) • n (NaOH) = 0.0223 mol • v (NaOH) = 20 mL = 0.02 L 12 Chemistry 2.2 quantitative chemistry CR 07

  6. c (NaOH) = n/v • = 0.0223 / 0.02 • = 1.115 molL-1 • = 1.12 molL-1 (3sf) 12 Chemistry 2.2 quantitative chemistry CR 07

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