Test Index

NCERT Class XII Chemistry
Chapter - Solutions
Questions with Solutions

© examsnet.com
Question : 41
Total: 53
Determine the osmotic pressure of a solution prepared by dissolving 25 mg of K2SO4 in 2 litre of water at 25°C, assuming that it is completely dissociated.
Solution:  
K2 SO4 dissolved =25 mg=0.025g
Volume of solution =2 L,‌‌T=250 C=298K
Molar mass of K2SO4=2×39+32+4×16
=174 gmol−1
K2SO4 dissociates completely as, K2 SO4→2K++ SO42−
i.e., ions produced =3,∴‌i=3
∴‌π=iCRT=i
h
V
RT
=i×
w
M
×1VRT
=3×
0.025g
174gmol−1
×
1
2 L
×0.0821L‌atm‌K−1‌mol−1×298K
=5.27×10−3 atm
© examsnet.com
Go to Question:
Prev Question
Next Question