Question

were pre hard 4. What can you deduce about the properties of the ion-exchanger? We con deduce the the ton exchanger removes me canons from water to soften the water. 5. As you washed the column with 6 M HCI, what happened to the colored region? Explain why As we washed the column wy 6M 40l, the colored region changed from blue to green. 6. Why must you wash the column with distilled water until the eluate is neutral to litmus before placing the hard water sample on the column? 48

Answer 1

Answer 6

Column is washed with distilled water till eluate is neutral to litmus so as to ensure that no excess acid (used in regeneration of cation exchanger) is present in the column.

Presence of acid and its anion may cause precipitation of salts of Ca²⁺ and Mg²⁺ which may cause embrittlement.