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Predict the osmotic pressure order for t...

Predict the osmotic pressure order for the following:
(I) `0.1 N` urea
(II) `0.1 N NaCl`
(III) `0.1 N Na_(2)SO_(4)`
(IV) `0.1 N Na_(3)PO_(4)`

Text Solution

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Molarity of urea `= 0.1 M`
Molarity of `NaCl = (0.1)/(1) =0.1 M`
Molarity of `Na_(2)SO_(4) = (0.1)/(2) = 0.05M`
Molarity of `Na_(3)PO_(4) = (0.1)/(3) = 0.033M`
`:.` Factor `'f' prop M xx (1-alpha + xalpha + yalpha)`
`prop M xx [1+(x+y)]` at `100%` ionisation
Thus factor `'f'` for urea `= 0.1 xx 0.1`
for `NaCl = 0.1 xx 2 = 0.2`
for `N_(2)SO_(4) = 0.05 xx 3 = 0.15`
for `Na_(3)PO_(4) = 0.033 xx 4 = 0.132`
`:. C.P.` order: `0.1 N NaCl gt 0.1 N Na_(2)SO_(4)`
`gt 0.1N Na_(3)PO_(4) gt 0.1N urea`
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