A student used the techniques in this module to estimate the K_sp of lead iodide

Question

A student used the techniques in this module to estimate the K_sp of lead iodide (Pbl_2). After precipitating and rinsing Pbl_2 in a reaction pipet, the student equilibrated the solid in distilled water. The equilibrium reaction is shown in Equation 18. PbI_2 (s) Pb^2+ (aq) + 2I^- (aq) The student analyzed 30 drops of the supernatant liquid for Pb^2+ ion by titrating it with 28 drops of 1.23 Times 10^-3 M EDTA, according to the reaction shown in Equation 19. Pb^2+ (aq) + EDTA^-4 (aq) PbEDTA^2- (aq) The student determined that the reaction pipet delivered 33 drops mL^-1 and the titration pipet delivered 23 drops mL^-1. Calculate the volume, in liters, of one drop delivered from the reaction pitet using Equation 6. Calculate the volume, in liters, of equilibrated supernatant liquid titrated, using Equation 7. Calculate the volume, in liters, of one drop delivered from the titration pipet, using Equation 6.

Explanation / Answer

Titration

(1) Volume of 1 drop delivered from reaction pipet = 1 x 0.05 = 0.05 ml = 5 x 10^-5 L

(2) Volume of supernatant liquid titrated = 30 drops x 0.05 x 10^-3 = 1.5 x 10^-3 L

(3) Volume of 1 drop delivered from titration pipet = 1 drop x 0.05 ml/1000 = 5 x 10^-5 L

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