3. To prepare 500 ml of 0.2 N KIO3 solution, which is needed as a reducing agent during titration in 1 M HCl, it is necessary to take a weighed portion of salt (g): 1) 21.4 2).42.8; 3)10.7; 4) 57.07; 5)5.35; 6)114.14.

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