1.

Consider separate solutions of 0.500 M C_(2)H_(5)OH(aq), "0.100 M "Mg_(3)(SO_(4))_(2)(aq),"0.250 M KCr(aq) and 0.125 M "Na_(3)PO_(4)(aq)" at "25^(@)C. Which statement is true about these solutions, assuming all salts to be strong electrolytes?

Answer»

`"0.500 M "C_(2)H_(5)OH (aq)` has the highest OSMOTIC pressure
They all have the same osmotic pressure
`"0.100 M "Mg_(3)(PO_(4))_(2)` has the highest osmotic pressure
`"0.125 M "Na_(3)PO_(4)(aq)` has the highest osmotic pressure

Solution :Osmotic pressure for ELECTROLYTES, `pi=iCRT`
`pi(C_(2)H_(5)OH)=1xx0.5RT=0.5RT,`
`pi(Mg_(3)(PO_(4))_(2))=5xx0.100RT=0.5RT`
`pi(KBr)=2xx0.25RT=0.5RT,`
`pi(Na_(3)PO_(4))=4xx0.125RT=0.5RT`
Thus, all solution have the same osmotic pressure.


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