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 4. Hard water contains polyvalent cations with their sulphate, chloride and carbonates generally of Ca^{​​​​​2+} and Mg^{​​​​​2+} . When Hard water is passed through cation exchanger these cations are replaced by Na+ or any monovalent cation and the water after passing through it left with no polyvalent cations hence considered Soft water.

Answer5. The colour region of will change its color due to cation are replaced by H⁺ ions.

Answer6. We must wash the column with distill water until the eluate is neutral to litmus before placing hard water in it because to get the quantitative analysis of hardness present in the hard water.

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