Iodometric Estimation of Copper using Sodium thiosulphate

Determination of Cu(II) using Na2S2O3 with K2Cr2O7 as primary standard Iodometry Copper can be estimated iodometrically Iodometric Titrations: Titrations in which oxidizing agent liberates I2 from an I- solution and then liberated I2 is titrated with a standard solution of reducing agent. It is an indirect titration In this titration iodine is liberated by oxidizing agent (Cu2+) which is titrated against reducing agent (sodium thiosulphate solution) using starch as indicator The reaction between potassium iodide solution and potassium dichromate solution in acidic medium liberates iodine Sodium thiosulphate (hypo) solution reduces liberated iodine (I2) to iodide (I-) The reaction between potassium iodide solution and copper sulphate solution liberates iodine Sodium thiosulphate (hypo) solution reduces liberated iodine to iodide