Answer the following questions according to requests(5 questions,30 points in total) 1,(7 points)Bubble H2S gas into an acidic solution of 0.01mol.I ZnCl2 till H2S is saturated,ZnS will precipitate when pH is 1.0.If a solution of 1.0mol.I KCN of same volume is first added into the solution,then bubbling HaS gas till H2S is saturated,please calculate the pH when ZnS precipitates?It is known that K [Zn(CN)-]=5.0x1016 Ka(H2S)=1.0x10-,K2(H2S)=1.0x1015.Note:Ionization of HCN is not considered here. 2(6 points)That E=0.5400V for the electrode reaction Cu+Ce>CuCI and that E(CuCu-0.3394V.E(Cu"/Cu)=0.5180Vis known,please caleulate the value of Kp(CuCl). 3,(7 points)You know Ksp (Cr(OH)3)=6.3x1031,and K=0.40 for the reaction of Cr(OH)3(s)+OH[Cr(OH)4.(1)Please calculate the pH when Cr ions are precipitated out completely;(2)What must be the initial minimum concentration of 1.0L NaOH solution where you can dissolve 0.10 mol Cr(OH)3 completely;(3)Please calculate Kabai([Cr(OH)4]). 4(5 points)Please calculate K(T=298.15K)for the reaction N2(g)+3 H2 (g)>2NH3(g) and the minimum temperature if the reaction proceeds in reverse direction?(That AG(298.15K,NH3)=-16.50KJ-mol-,AH(298.15K,NH3)=-46.11KJ-mol- Sm(298.15K,NH3)=-198.7J-mol".K is known) 5(5 points)1.500mol NO,1.000mol Cl2 and 2.500mol NOCI is mixed in a 15.0L container.3.060mol NOCI is found at 230C when the reaction 2NO (g)+Cl2(g)==2NOCI(g)is at equilibria.Please calculate the amount of NO at equilibria and K of the reaction 第6页 六、Answer the following questions according to requests (5 questions, 30 points in total) 1、(7 points) Bubble H2S gas into an acidic solution of 0.01mol.l-1 ZnCl2 till H2S is saturated, ZnS will precipitate when pH is 1.0. If a solution of 1.0mol.l-1 KCN of same volume is first added into the solution, then bubbling H2S gas till H2S is saturated, please calculate the pH when ZnS precipitates? It is known that Kf Θ [Zn(CN)4 2－ ]＝5.0×1016, Ka1 Θ(H2S) ＝1.0×10－8 ，Ka2 Θ(H2S)＝1.0×10－15. Note: Ionization of HCN is not considered here. 2、(6 points) That E = 0.5400V for the electrode reaction Cu2+ +C1- + e CuC1 and that E → (Cu2+/Cu) =0.3394V，E (Cu+ /Cu)= 0.5180V is known，please calculate the value of Ksp Θ(CuCl). 3、(7 points) You know Ksp Θ (Cr(OH)3) = 6.3×10-31, and KΘ = 0.40 for the reaction of Cr(OH)3 (s) + OH- [Cr(OH)4] - . (1) Please calculate the pH when Cr3+ ions are precipitated out completely; (2) What must be the initial minimum concentration of 1.0L NaOH solution where you can dissolve 0.10 mol Cr(OH)3 completely; (3) Please calculate Kstability Θ([Cr(OH)4] - ). 4、(5 points) Please calculate KΘ( T = 298.15K) for the reaction N2(g) +3 H2 (g)→2NH3(g), and the minimum temperature if the reaction proceeds in reverse direction? (That ΔfGm Θ(298.15K, NH3) = -16.50KJ⋅mol-1, ΔfHm Θ(298.15K, NH3) = -46.11KJ⋅mol-1, Sm Θ(298.15K, NH3) = -198.7J⋅mol-1⋅K- is known) 5、(5 points) 1.500mol NO, 1.000mol Cl2 and 2.500mol NOCl is mixed in a 15.0L container. 3.060mol NOCl is found at 230 when the reacti ℃ on 2NO（g）+Cl2(g)===2NOCl(g) is at equilibria. Please calculate the amount of NO at equilibria and KΘ of the reaction. 第 6 页