Prelaboratory assignment Exp. 9 Kap Name Date:- -Lab Sectio 1. A saturated of mo

Question

Prelaboratory assignment Exp. 9 Kap Name Date:- -Lab Sectio 1. A saturated of moUL (see photo). solution of leadi(II) iodide, Pblz has an iodide concentration of 3.0 x103 a. What is the molar solubility of Pbl; b. Determine the solubility constant, K fr leadli) iodide. Does the molar solubility of leadiIl) iodide increase, decrease, or remain unchanged with the addition of potassium sodide to the solution? Explain. c. 2. What is the indicator used to detect the endpoint in the titration for this experiment? 3, What is the expected color change at the endpoint in this experiment? (Hint: Textbook Table 17.3)

Explanation / Answer

Q1

a)

molar solubiltiy of PbI2

1 mol of PbI2 = 2 mol of I-

then

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

solubility is 1.5*10^-3 Ma pprox

b)

Ksp = [Pb+2][I-2]^2

[Pb+2] = [PbI2] = 1.5*10^-3

Ksp = (3*10^-3)(1.5*10^-3)^2 = 6.75*10^-9

c)

if we add KI, then I- ions increases, which will shif ttowards PbI2(s)

this decrease solubility as more solid is formed

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