Question

Dissolve 18g of glucose in 3 liters of water.at 300k temparature what is osmotic pressure? a.8.3 barr b.0.83 barr c.0.0083 barr d.0.083 barr

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Chemistry

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Colligative Properties and Determination of Molar Mass

At 300 K, 36 g of glucose p...

CHEMISTRY

At 300 K,36 g of glucose present in a litre of its solution has an osmotic pressure of 4.98 bar. If the osmotic pressure of the solution is 1.52 bars at the same temperature, what would be its concentration?

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ANSWER

As per the van't Hoff equation, the relationship between the osmotic pressure and the molar concentration is Π=CRT. Here, R is the ideal gas constant and T is absolute temperature.

C

1

=

180

36

M

(Note: Molar mass of glucose is 180 g/mol and molar concentration is the ratio of number of moles of glucose to the volume of solution in L. Number of moles is the ratio of mass to molar mass).

Π

1

=4.98 bar

C

2

= ?

Π

2

=1.52 bar

4.98=

180

36

RT ......(i)

1.52=C

2

RT ......(ii)

Divide equation (ii) with equation (i),

36

C

2

×180=

4.98

1.52

C

2

=0.061 M

Hence, second solution has concentration of 0.061 M.