The percentage of copper in copper (II) salt can be determined by using a thisulphate titration. A 0.305g of copper (II) salt was dissolved in water and added to an excess of potassium iodide solution liberating iodine according to the following equation: 2Cu^(2+)(aq)+4I^(-)(aq)to2Cul(s)+I_(2)(aq) The iodine liberated required 24.5cm^(3) of a 0.1 mole dm^(-3)solution of sodium thiosulphate for titration according to reaction: 2S_(2)O_(3)^(2-)+I_(2)(aq)+S_(4)O_(6)^(2-)(aq) The percentage of copper by mass in the copper (II) salt is (Atomic mass of copper =63.5)

The percentage of copper in copper (II) salt can be determined by usin

1.	The percentage of copper in copper (II) salt can be determined by using a thisulphate titration. A 0.305g of copper (II) salt was dissolved in water and added to an excess of potassium iodide solution liberating iodine according to the following equation: 2Cu^(2+)(aq)+4I^(-)(aq)to2Cul(s)+I_(2)(aq) The iodine liberated required 24.5cm^(3) of a 0.1 mole dm^(-3)solution of sodium thiosulphate for titration according to reaction: 2S_(2)O_(3)^(2-)+I_(2)(aq)+S_(4)O_(6)^(2-)(aq) The percentage of copper by mass in the copper (II) salt is (Atomic mass of copper =63.5)
Answer» 64.2 51 48.4 25.5 Answer :B