1-3 1-3 1. A saturated solution of PbCl2 was found to have a lead ion concentrat
ID: 697554 • Letter: 1
Question
1-3
1-3 1. A saturated solution of PbCl2 was found to have a lead ion concentration of 85 x 10 3 M at 25 What is the Kup for the compound? 2. Calculate the molar solubility of A&cro;, at 25.0 if-is 2 x 10 a 3. The titration curve shown in Fig. 1 is for the titration of 25.00 ml of a diprotic acid with 0.1036 M NaOH. Use the curve to determine the molarity, K,: and Ko of the acid. 4. Complete and balance the following equations: a) Agco.(s) + HNO,(aq) b) AgCl(s) + NH3(aq) 5. Sketch a properly labeled electrochemical cell that uses the reaction: Zn(s) + cut(aq) Zn"(aq) + Cu(s) and write the shorthand notation for the cell. 6. If E for the above cell at 25 'C is 1.10 V, what is E for Zn'/ Zn couple given that E for Cu/Cu couple is 0.34 V?
Explanation / Answer
1.
PbCl2 (s) = Pb2+ (aq.) + 2 Cl- (aq.)
Ksp = [Pb2+][Cl-]2
Ksp = S * (2S)2
Ksp = 4 S3
Ksp = 4 * (8.5*10-3)3
Ksp = 2.46 * 10-6
2.
Ag2CrO4 (s) = 2 Ag+ (aq.) + CrO42- (aq.)
Ksp = [Ag+]2[CrO42-]
Ksp = (2S)2(S)
Ksp = 4 S3
S = (2 * 10-12 / 4)(1/3)
S = 7.94 * 10-5 M
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