3.55g of bleaching powder when treated with acetic acid and excess of KI liberated iodine which required 60mL of 0.5N sodium thiosulphate solution. The percentage of available chlorine in the sample is

Bleaching power is a mixed salt of hydrochloric acid and hypochlorious acid. It has the formula, CaOCI_(2).H_(2)O . It is manuafactured by the action of chlorine on dry slaked lime at 40^(@)C . There is also a view that bleaching power is a mixture [Ca(OCI)_(2)+CaCI_(2).Ca(OH)_(2).H_(2)O] . The amount of chlorine obtained form a sample of bleching power by the treatement with excess of dilute acids or CO_(2) is called a available chlorine. A good sample of bleaching power constains 35-38% of available chlorine. On long standing, it undergoes auto-oxidation and the amount of acvailable chlorine decreases. The estimation of available chlorine is done volumetrically by (a) iodometric method or by (b) aresenite method. In textile industry, the cotton cloth is mainly bleached with the help of bleaching power. 3.55 g of bleachig power when treated with acetic acid and excess of KI liberated iodine which required 60 mL of 0.5 N sodium thiosulphate solution. The percentage of available chlorine in the sample is

1.5 gm sample of bleaching power was suspended in water. If was treated with CH_(3)COOH followed by the addition of excess of Kl. The liberated iodine required 150 mL of (M)/(10) hypo solution for complete titration. The percentage of available chlorine in the sample is

5g of a sample of bleaching powder is treated with excess acetic acid and KI solution. The liberated I_(2) required 50 mL of N/10 hypo. The % of available chlorine in the sample.

3.55 g sample of bleaching powder suspended in H_(2)O was treated with enough acetic acid and KI solution. Iodine thus liberated required 80 mL of 0.2 N hypo for titration. Calculate the % of available chlorine.

0.5 g mixture of K_(2)Cr_(2)O_(7) and KMnO_(4) was treated with excess of KI in acidic medium. Iodine liberated required 100 cm^(3) of 0.15N sodium thiosulphate solution for titration. Find the per cent amount of each in the mixture.

A 7.1 g sample of bleaching powder suspended in H_(2)O was treated with enough acetic acid and KI solution. Iodine thus liberated required 80 mL of 0.2 N hypo solution for titration. Calcutale the % of available chlorine :

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.

0.10g of a sample conining CuCo_3 and some inert impurity was dissolved in dilute sulphuric acid and volume made up to 50mL . This solution was added into 50mL of 0.04MKI solution where copper precipitates as CuI and I^- is oxidized into I_3^- . A 10mL 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 20mL of 2.5mM sodium thiosulphate solution to reach the end point . Determine mass percentage of CuCO_3 in the original sample.

0.5g mixture of K_2Cr_2 O_7 and KMnO_4 was treated with excess of KI in acidic medium. Iodine liberated required 150cm^3 of 0.1N solution of thiosulphate solution for titration. Find the percentage of K_2 Cr_2 O_7 in the mixture :

10.0 g of CaOCl_2 is dissolved in water to make 200 mL solution 20 " mL of " it is acidified with acetic acid and treated with KI solution the I_2 liberated required 40 " mL of " (M)/(20)Na_2S_2O_3 solution. Find the percentage of available chlorine.