1.

Consider separatesolutions of 0.500 M C_(2)H_(5)OH(aq), 0.100 M Mg_(3)(PO_(4))_(2)(aq), 0.125 M Na_(3)PO_(4)(aq)at 25 0 C. Which statement is true about these solutions, assuming all salts to be strong electrolytes ?

Answer»

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

Solution :Osmotic pressure,
`pi=icRT`
`pi[C_(2)H_(5)OH]=1xx0.500xxR XX T=0.5"RT"`
`pi[Mg_(3)(PO_(4))_(2)]=5xx0.100xxRxxT=0.5RT`
`pi[KBR]=2xx0.250xxRxxT=0.5RT`
`pi[Na_(3)PO_(4)]=4xx0.125xxRxxT=0.5RT`
Therefore, all have same osmotic pressure.


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