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. `0.125 M Na_(3)PO_(4) (aq)` has the highest osmotic pressureB. `0.500 M C_(H_(5))OH (aq)` has the highest osmotic pressureC. they all have the same osmotic pressureD. `0.100 M Mg_(3) (PO)_(2) (aq)` has the highest osmotic pressure. |
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Answer» Correct Answer - 3 we have `pi=iCRT` For `C_(2)H_(5)OH` which neither associates nor dissociates `pi=(1)(0.500 M)RT` For magbesium phosphate which dissociates `Mg_(3)(PO_(4))_(2)(aq) rarr 3 Mg^(2+)(aq)+2PO_(4)^(3-)(aq)` `pi=(5)(0.100 M) RT` For potassium bromide, which dissociates `KBr(aq) rarr K^(+)(aq) pi=(2)(0.250 M)RT` For sodium phosphate which dissociates `Na_(3)PO_(4)(aq) rarr 3Na^(+)(aq)+PO_(4)^(3-)(aq)` `pi=(4)(0.125 M) RT` Thus, all have same effective molarity and are isotonic solution. They all have some osmotic pressure at the same temperature. |
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