Part A) calculate the value of Q. What is the value of Q when the solution conta

Question

Part A) calculate the value of Q. What is the value of Q when the solution contains 2.00 x 10^-2 M Sr2+ and 1.50x10^-3 M CrO42-?

Part C) what concentration of the lead ion pb2 + must be exceeded to precipitate pbf2 from a solution that is 1.00 x 10^-2 m in the fluoride ion F-. KSP for lead (II) fluoride is 3.3x10^ 8

a e asu page O canvas M osu o olMB email O avem ual CH 123 General Chemistry Spring 2017 Question 20 Learning Goal: To understand the relationship between precipitation and the solubilty product and to be able to predict whether a substance will precipitate or Precipitation is the formation of an insoluble substance. For the equation AB(s) A (aq) B (aq), precipitation represents a shift to the left of a solid From Le Chateliers principle, we know that and the production when the product of the concentrations of At and B gets above a eenain level, the reaction wil respond by shifting left concentrations of A and B This critical level, K,r is a constant at a certain lemperature, In this case, Q lA IB l where q is the ion when Q r ation occurs until Q equal to When Q a precipitate does nof form

Explanation / Answer

SrCrO4(s) <--> Sr+2 + CrO4-2

Q = [Sr+2][CrO4-2]

Q = (2*10^-2)(1.5*10^-3) = 0.00003

Q = 3*10^-5

C)

find Pb+2 in order to favour precipitateon

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

3.3*10^-8 = [Pb+2](10^-2)^2

[PB+2}= (3.3*10^-8 ) / ((10^-2)^2)

[Pb+2] = 0.00033 M

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