A 5g sample of bronze was dissolved in `H_(2)SO_(4)` for estimation of Cu metal.(Copper becomes into the solution as `CuSO_(4)`). To the resulting solution excess of KI was added to form CuI and `I_(3)`.If `I_(3)` formed required 63ml ,0.5M sodium thiosulphate solution .The mass % of Cu in the sample of bronze is

0.80 g of sample of impure potassium dichromate was dissolved in water and made up to 500 mL solution. 25 mL of this solution treated with excess of KI in acidic medium and I_(2) liberated required 24 mL of a sodium thiosulphate solution. 30 mL of this sodium thiosulphate solution required 15 mL of N//20 solution of pure potassium dichromate. What was the percentage of K_(2)Cr_(2)O_(7) in given sample?

25 mL of H_(2)O_(2) solution were added to excess of acidified solution of KI . The iodine so liberated required 20 mL of 0.1N Na_(2)S_(2)O_(3) for titration Calculate the strength of H_(2)O_(2) in terms of normalility, percentage and volumes. (b) To a 25 mL H_(2)O_(2) solution, excess of acidified solution of KI was added. The iodine liberated required 20 mL of 0.3N sodium thiosulphate solution. Calculate the volume strength of H_(2)O_(2) solution.

638.0 g of CuSO_(4) solution is titrated with excess of 0.2 M KI solution. The liberated I_(2) required 400 " mL of " 1.0 M Na_(2)S_(2)O_(3) for complete reaction. The percentage purity of CuSO_(4) in the sample is

0.10 g of a sample containing CuCO_(3) and some inert impurity was dissolved in dilute sulphuric acid and volume made up to 520 mL. This solution was added into 50mL of 0.04 M KI solution where copper precipitates as Cul and I^(-) is oxidized into I_(3)^(-) . A 10 mL portion of this solution is taken for analysis, filtered and made up free I_(3)^(-) 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 CuCO_(3) in the original sample.

50.0 g sample of brass is dissolved in 1 L dil H_2SO_4.20mL of this solution is mixed with KI, and the liberated I_2 required 20 " mL of " 0.5 M hypo solution for titration calculate the amount of Cu in the alloy.

A sample of Na_(2)CO_(3).H_(2)O weighing 0.62 g is added to 10 ml of 0.1 N H_(2)SO_(4) solution . The resulting solution will be

5g sample of brass was dissolved in one litre dil. H_(2)SO_(4) . 20 ml of this solution were mixed with KI, liberating I_(2) and Cu^(+) and the I_(2) required 20 ml of 0.0327 N hypo solution for complete titration. Calculate the percentage of Cu in the alloy.

0.5 g sample of copper ore is converted into CuSO_4 solution. The resulting solution is acidified with dilute CH_3COOH (acetic acid) and excess KI added. The liberated I_2 required 0.248 g Na_2S_2O_3.5H_2O for complete reaction. Calculate the percantage of Cu in the ore.