The percentage of copper (II) salt can be determined by using a thiosulphate titration. 0.305g of a 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) rarr 2CuI(s)+ I_(2) ( aq) The iodine liberated required 24.5cm^(3) of a 0.100 mol dm^(-3) solution of sodium thiosulphate. 2S_(2)O_(3)^(2-) (aq) + I_(2) (aq)rarr 2I^(-) ( aq) + S_(4) O_(6)^(2-) (aq) The percentage of copper, by mass, in the copper ( II) salt is

The percentage of copper (II) salt can be determined by using a thiosu

1.	The percentage of copper (II) salt can be determined by using a thiosulphate titration. 0.305g of a 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) rarr 2CuI(s)+ I_(2) ( aq) The iodine liberated required 24.5cm^(3) of a 0.100 mol dm^(-3) solution of sodium thiosulphate. 2S_(2)O_(3)^(2-) (aq) + I_(2) (aq)rarr 2I^(-) ( aq) + S_(4) O_(6)^(2-) (aq) The percentage of copper, by mass, in the copper ( II) salt is
Answer» 64.2 `51.0` 48.4 25.5 Answer :B