Question

Tods EQUL0400: Eatimacing the Solubility Product Constant of Strontium ledate Using Microscale Technique 228 3. A student used the techniques in this module to estimate the Kp of lead iodide (Pbl). After preci- pitating and rinsing Pbl2 in a reaction pipet, the student equilibrated the solid in distilled water. The cquilibrium reaction is shown in Equation 18 (Eq. 18) Pbla(s)Pb(aq) +21 (aq) The student analyzed 30 drops of the supernatant liquid for Pb ion by titrating it with 28 drops of 1.23 x 10 M EDTA, according to the reaction shown in Equation 19 (Eq. 19) Pb+(aq)+EDTA (aq) PbEDTA 2-(aq) The student determined that the reaction pipet delivered 33 drops mL and the titration pipet delivered 25 drops mL. (1) Calculate the volume, in liters, of one drop delivered from the reaction pipet, using Equation 6. (2) Calculate the volume, in liters, of equilibrated supernatant liquid titrated, using Equation 7. (3) Calculate the volume, in liters, of one drop delivered from the titration pipet, using Equation 6.

Answer 1

i 33 drops = 1 ml = 0.001L al drop = 0.0911 = 3.03810 L I drop of reaction pipet = 3:03x10 L 2. volume of super hatent liquid Hitrated = 30x3:03x10°C = 9:09 X1042 3. 25 drops = 1 ml =0.001L .. I drop = (0.001) = 4.00x10 L al drop of titration pepet = 4.008105 2