CHM 222 /224 Practice Exam (Ch 14-17) Name 13. The molar solubility of A 00h in

Question

CHM 222 /224 Practice Exam (Ch 14-17) Name 13. The molar solubility of A 00h in pure water is 1.3 × 10 example 17.9) M. Calculate K. (Check 14. Which acid would you choose to combine with its sgdium salt to make a solution buffered at pH 5.4? For the best choice, calculate the ratio of the conjugate base to the acid required to attain the desired pH. (Check example 17.5) chlorous acid (HCIO2) pK 1.95 formic acid (HCHO2) acetic acid (HC2HyOg ) pK,4.74 hypochlorous acid (HCO) pka = 3.74 pk,-7.54 54 15. Which combination is the best choice to prep a buffer with a pH of 9.0? NHs NHCI (pKo for NH 475 b. C5H5N ; C5HsNHCI (pKs for C5H5N # 8.76) c. HNO2; NaNO2 (pK, for HNO2 3.33) d. HCHO:NaCHO2 (pK, for HCHO- 3.74)

Explanation / Answer

13)

At equilibrium:
Al(NO3)3 <---->     Al3+     +         3 NO3-  

                     s                  3s      

Ksp = [Al3+][NO3-]^3
Ksp = (s)*(3s)^3
Ksp = 27(s)^4
Ksp = 27(1.3*10^-2)^4
Ksp = 7.71*10^-7
Answer: 7.71*10^-7

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