c 90 a 0470 0 10 g of a sample containing CuCO and some

Last updated: 6/30/2023

c 90 a 0470 0 10 g of a sample containing CuCO and some inert impurity was dissolved in dilute sulphuric acid and volume made up to 50 mL This solution was added into 50 mL of 0 04 M KI solution where copper precipitates as Cul and I is oxidized into I3 A 10 mL portion of this solution is taken for analysis filtered and made up free I3 and then treated with excess of acidic permanganate solution Liberated iodine required 20 mL of 2 5 mM sodium thiosulphate solution to reach the end point Determine mass percentage of CuCO3 in the original sample a 7 41 c 61 75 b 74 1 d None of these