ANSWER ALL QUESTIONS 10. Calculate the solubility of silver oxalate, Ag:CO, in p

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ANSWER ALL QUESTIONS

10. Calculate the solubility of silver oxalate, Ag:CO, in pure water. Kie -1.0x 10 A) 14 x 10* M B) 8.2 × 105 M C) 5.4 x 10-5 M D) E) 3.2×10-6 M 2.5×10-12 M A substance has a very high melting point, 3000 C and is very hard. It has a very dull appearance and is not shiney. What type of solid is this substance? A) atomic B) metallic C) molecular D) ionic E) covalent network 12. Which of the following is the most acidic: HBO), HIO, HCIO, and HCI? A) HBrOs B) HCIO C) HIOs D) HCIO E) None of the answers is correct 13. Consider the following structures (1 and 2 are octahedral; 3 and 4 are square planar) - ethylene diamine Which one of the following statements about the above structures is correct? A) Structures 1 and 2 are superimposable. B) Structures 1 and 2 are geometric isomers. C) Structures 3 and 4 are structural isomers. D) Structures 3 and 4 are optical isomers. E) Structures 3 and 4 are geometric isomers. Consider the following octahedral complex structures, each involving ethylene diamine and two different, unidentate ligands X and Y 14. ethylene diamine Which, if any, of the following pairs are optical isomers? A) B) C) Structures 1 and 2 Structures 1 and 3 Structures 1 and 4 D) E) Structures 3 and 4 None of the above choices is correct.

Explanation / Answer

Q10

solubility can be assume to be

1 mol of Ag2C2O4 per liter

so

Ag2C2O4 <--> 2Ag+ + C2O4-2

Ksp = [Ag+]^2[C2O4-2]

let

Ag2C2O4 = 2 mol of Ag+ = 2 S

Ag2C2O4 = 1 mol of C2O4-2 = 1 S

substitutein Ksp

10^-11 = (2S)^2(S)

4*S^3 = 10^-11

S = ((10^-11)/(4))^(1/3)

S = 0.00013572 mol of Ag2C2O4 per liter

S= 1.36*10^-4 M

choose A

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