20 Standard Reduction Potentials 22 Cu aq 2e Sn aq 2e Fe aq

Last updated: 5/10/2023

20 Standard Reduction Potentials 22 Cu aq 2e Sn aq 2e Fe aq 2e Zn og 2e AP aq 3e 2e Cu x Sn x Fe s Zn s Al x 0 337 V 0 137 V 0 444 V 0 763 V 1 676 V 2 356 V Mg aq Mg s A buried metal tank will not corrode if it is wired to a metal rod that corrodes more easily Which combination protects the tank from corrosion A Mg rod and Sn tank C Fe rod and Al tank B Fe rod and Zn tank D Cu rod and Zn tank 21 The solubility of a salt in water usually increases with increasing temperature because the process is A exothermic so dissolution occurs faster B endothermic so dissolution occurs faster C exothermic so the higher temperature favors dissolution D endothermic so the higher temperatures favors dissolution What is the net ionic equation for the reaction of aqueous solutions of Pb NO and KCI A Pb aq Cl aq PbCl s B Pb aq 2Cl aq PbCl x C Pb NO aq 2KCl aq D 2K aq 2Cl aq Pb aq 2NO aq 2KNO aq PbCl s 2K aq 2NO aq PbCl s 23 Equal volumes of solutions of acids and their sodium salts are mixed to prepare a buffer The solution with pH closest to 5 0 was prepared by mixing A 1 0 x 10 M hydrochloric acid and 0 1 M NaCl B 0 10 M benzoic acid K 6 3 x 10 and 0 10 M sodium benzoate C 0 10 M butyric acid K 1 5 x 10 and 0 10 M sodium butyrate D 0 10 M formic acid K 4 3 x 10 and 0 10 M sodium formate