Experiment 22 Prelaboratory Assignment Molar Solubility. Common-lon Effect DateL

Question

Experiment 22 Prelaboratory Assignment Molar Solubility. Common-lon Effect DateLab Se. ,A saturated solution of lead(lT) iodide, Pbl, has an iodide concentration of 3.0x 10 Name moVL (see photo). a. Desk No.- What is the molar solubility of Pbl, b. Determine the solubility constant, Kup for leadili) iodide. 50 e. Does the molar solubility of lead(II) iodide increase, decrease, or remain Leod iodide precipitate. unchanged with the addition of potassium iodide to the solution? Explain 2 Experimental Procedure, Part AA. what is the purpose of rinsing the pipet twice with aliquots of the 6b saturated Ca(OH), solution? Experimental Procedure, Part A.4 a. What is the indicator used to detect the endpoint in the titration for this experiment? 3. b. What is the expected color change at the endpoint in this experiment? 4. Experimental Procedure, Part A.5. The directions are to read and record the initial volume of the buret to the correct number of significant figures. Explain what this means. Experiment 22 267

Explanation / Answer

1.

(a)

PbI2 (s) = Pb2+ (aq.) + 2 I- (aq.)

                 1.5 * 10-3 M 3.0 * 10-3 M

Solubility of PbI2 = (1/2)[I-] = 1.5 * 10-3 M

(b)

Ksp = [Pb2+][I-]

Ksp = ( 1.5 * 10-3) * ( 3.0 * 10-3)

Ksp = 4.5 * 10-6

(c)

Addition of KI, will increase the concentrationof I- ion and hence the equilibirum is shifted towards left side. So, solubility of PbI2 will be decreased.

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