How many moles of KCl are contained in each solution?
a. 0.556 L of a 2.3 M KCl solution
b. 1.8 L of a 0.85 M KCl solution
c. 114 mL of a 1.85 M KCl solution
Solution 57E: Step1: We can say that all metals are not equally reactive. That is why, reactive metals can displace less reactive metals from their compounds in solution or molten form. In order to know, which metal is more reactive, several experiments were performed, and finally a series known as the reactivity or activity series was developed.The metals at the top of the activity series are readily oxidized whereas those at the bottom of the activity series are least readily oxidized. Step2: a) For the reaction (i), since, cadmium is placed below zinc in the activity series. Thus Zinc reduces cadmium from its salt solution. Zinc itself gets oxidized and goes into solution. Thus, the net ionic equation is: Zn(s) + Cd2+(aq) ------> Zn2+(aq) + Cd(s) For the reaction(ii), Cadmium, being above nickel in the activity series reduces nickel from its salt solution. Cadmium itself gets oxidized and goes into solution. The net ionic equation is: Cd(s) + Ni2+(aq) -------> Cd2+(aq) + Ni(s) Step3: b) Cadmium is placed below chromium and iron and above cobalt in the activity series. This is because cadmium can displace cobalt from its salt solution whereas chromium and iron can displace cadmium from its salt solution. Hence, chromium, iron and cobalt closely define the position of cadmium in the activity series. c) In order to locate cadmium in the activity series, we can perform displacement reaction test. If we place a cadmium strip into a metal salt solution and if it is reduced, it will indicate that cadmium is below the metal in the activity series and if it is oxidized, then it will indicate that cadmium is placed above the metal in the activity series. ------------