InterviewSolution
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InterviewSolution
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Consider separate solutions of `0.500 M C_(2)H_(5)OH(aq)`,`0.100 M Mg_(3)(PO_(4))(aq)`,`0.250 M KBr(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?A. They all have the same osmotic pressureB. `0.100 M Mg_(3)(PO_(4))_(2)(aq)` has the highest osmotic pressureC. `0.125 M Na_(3)PO_(4)(aq)` has the highest osmotic pressureD. `0.500 M C_(2)H_(5)OH(aq)` has the highest osmotic pressure |
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Answer» Correct Answer - A `{:(0.5 M C_(2)H_(5)OH(aq),0.1M Mg_(3)(PO_(4))_(2)(aq)),(i=1,i=5),("effective molarity "=0.5,"effective molarity "=0.5 m),(0.25 M KBr (aq),0.125 M Na_(3)PO_(4)(aq)),(i=2,i=4),("effective molarity "=0.5 M,"effective molarity "=0.5 M):}` Hence all colligative properties are same. Note : This equation is solved by assuming that the examinar has taken `Mg_(3)(PO_(4))_(2)` to be completely soluble. However the fact is that it is insoluble (sparingly soluble). |
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