explain why equimolar aqueous solutions of NaCl and ZnSO4 are isotonic
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Answer:
Because they have different vant hoff factor.
Explanation: Isotonic solutions are those solutions which have the same osmotic pressure. If osmotic pressures are equal at the same temperature, concentrations must also be equal.
\pi =iCRTπ=iCRT for electrolytes
\piπ = osmotic pressure
C= concentration
R= solution constant
T= temperature
i= vant hoff factor
1) For NaClNaCl , when it undergoes complete dissociation, i= 2
NaCl\rightarrow Na^++Cl^-NaCl→Na
+
+Cl
−
2) For Na_2SO_4Na
2
SO
4
, when it undergoes complete dissociation, i= 3
Na_2SO_4\rightarrow 2Na^++SO_4^{2-}Na
2
SO
4
→2Na
+
+SO
4
2−
Thus even if the molarity and temperature is same, osmotic pressures will be different.
Explanation:
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