A sample of hard water contains 0.005 moles of calcium chloride per litre.What is the minimum concentration of sodium sulphate which must be added for removing theCa^(2+)ions from this water sample ?K_(sp) " of "CaSO_4= 2.4 xx 10^(-5)

A sample of hard water contains 0.005 moles of calcium chloride per li

1.	A sample of hard water contains 0.005 moles of calcium chloride per litre.What is the minimum concentration of sodium sulphate which must be added for removing theCa^(2+)ions from this water sample ?K_(sp) " of "CaSO_4= 2.4 xx 10^(-5)
Answer» <html><body><p>`4.8 xx <a href="https://interviewquestions.tuteehub.com/tag/10-261113" style="font-weight:bold;" target="_blank" title="Click to know more about 10">10</a>^(-2)`<br/>` 4.8 xx 10^(-3)` <br/>` 2.4 xx 10^(-2)` <br/>` 2.4 xx 10^(-3)` </p>Solution :`[<a href="https://interviewquestions.tuteehub.com/tag/ca-375" style="font-weight:bold;" target="_blank" title="Click to know more about CA">CA</a>^(+2)]= 5 xx 10 ^(-3)M` <br/>From`K_(<a href="https://interviewquestions.tuteehub.com/tag/sp-1219706" style="font-weight:bold;" target="_blank" title="Click to know more about SP">SP</a>)" of "CaSO_4` <br/>` 2.4 xx 10 ^(-5)= 5 xx 10^(-3)xx [SO_4 ^(-2) ]` <br/>` [SO_4^(-2)]= 4.8 xx 10 ^(-3)<a href="https://interviewquestions.tuteehub.com/tag/mz-1108227" style="font-weight:bold;" target="_blank" title="Click to know more about MZ">MZ</a>` <br/> ` [Na_2 SO_4 ] =4.8 xx 10^(-3)M`</body></html>