formula of metallic perchlorate???
Answers
ACID-FREE standard solutions (0.05 M) of the perchlorates of the divalent metals copper, nickel, cobalt, iron, zinc and manganese suitable for use in the determination of stability constants of chelates by the potentiometric method can be prepared utilizing an ion-exchange technique. A column 1.6 cm. diameter containing 50 ml. ‘Amberlite’ cation exchange resin IR 120(H) is treated with a solution (0.1 M) of the pure sulphate or chloride of the divalent metal until the pH's of the entrant and issuing solutions are identical. After eluting the excess metal salt solution with water the metal ions bound to the resin are displaced by passing a pure solution of barium perchlorate (0.052 M) on to the resin. Since barium ions have a stronger affinity for the resin than the divalent ions of copper, nickel, cobalt, iron, zinc and manganese, the latter are displaced and the barium-free fractions of the eluates contain the pure perchlorate solutions of these metals.
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