e) Calculate the ptt of a buffer that is 0.058 M 1HF and 0.058 M LIF. The Ka for

Question

e) Calculate the ptt of a buffer that is 0.058 M 1HF and 0.058 M LIF. The Ka for Hr is A) 1054 )46 931 D) 2.86 E)3.46 of 0.12M NIH The Ka for NH mixing 250.0 ml or 0.15M NH Into water with the addition of 200 o ml. A) 10.74 B)945 c655 D96 12) Calculate the pH of 0.12M NH, solut on. The Ka for Nit, is 1.77x10, A) 6.55 B) 12.45 C)1117 D)10.12 mM in Naci. What will happen 3 ls mixed with a solution of NaCI to form a solution that is 0.02 mM in AgNOs and 0.001 m once these solutions are mixed? Ksp (AgCi)-1.77 10-10, solutions are A) Nothing B) Selver chloride C) Nothing will happen since NaCI and AgNOj are both soluble compua D) Silver chloride E) There is not enough information ppen since the molar solubility of AgCl is higher than its solution ion-product expeession ll precipitate out of solution, leaving a saturated AgCI solution. will precipitate out of solution, leaving an unsaturated solution of AgCl to say anything about this solution. nge will be observed if P is constantly removed from the following reaction? A) Equilibrium will shift left B) No changeC) Equilibrium will shift right BaF(s) Ba (aq) 2F (aq) Dependent on temperature E) Not enough information to answer D) 15. Calculate the molar solubility of tin'(I) hydroxide in pure water. Kp545 x 10 Sn(OH)20S 20H A) 2.22 x 10" ? B) 1.73 x 10-8M E) 0.001 M C) 1.11 x 10" M D) 5.24 x 10"s M 16). The common ion effect will A) increase the solubility of the relevant precipitate B) reduce the solubility of the relevant precipitate C) have no impact on the solubility of the relevant precipitate D) increase the acidity of the relevant precipitateE) decrease the acidity of the relevant precipitate 17)Which of the following statements is true? I. In an electrolytic cell, there is only a reduction process. Il. The potential of a cell depends on temperature. ITI. Spontaneous oxidation-reduction reactions have Eo> 0. e) lI & III b.II c, I & II 18) What is the reducing agent in the redox reaction represented by the following cell notation? Ni(s) I Ni?t(aq) I1 Ag (aq) 1 Ag(s) B) Ag (aq) C) Pt E) Ni(s) A) Ag(s) 19) Given: 3 Cl2(8) 2 Fels)-6C(ag)+2Fe (aq) +2e2Cl (a) E +1.36 V Which of the following is incorrect?

Explanation / Answer

10. According to Henderson-Hasselbulch equation:

pH = pKa + Log([LiF]/[HF])

Here, pKa = -Log(Ka) = -Log(3.5*10-4)

i.e. pKa = 3.456 + Log(0.058/0.058)

= 3.456 + Log(1)

= 3.456 + 0

= 3.456 ~ 3.46 (Option E)

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