A solution of 6% (wt/vol) of urea is isotonic with NaCl (aq) What js t

1.	A solution of 6% (wt/vol) of urea is isotonic with NaCl (aq) What js the weight % of NaCl solution ?
Answer» ong>Answer: 0.5m NaCl Explanation: Two solutions are isotonic if they have the same OSMOTIC pressure. Osmotic pressure π=iCRT For NaCl, the van 't Hoff factor i=2 as one NaCl molecule DISSOCIATES into 2 ions. For urea, the van 't Hoff factor i=1 as urea does not dissociate. 6% W/V aqueous solution of urea means 6 g urea in 100 ML solution or $$ 60 g urea in 1000 mL (1 L) solution. C= 60g/mol×1L 60 g =1M i urea ×C urea =i NaCl ×C NaCl 1× 1 M= 2×C NaCl C NaCl =0.5 M

A solution of 6% (wt/vol) of urea is isotonic with NaCl (aq) What js the weight % of NaCl solution ?

Answer»

ong>Answer:

0.5m NaCl

Explanation:

Two solutions are isotonic if they have the same OSMOTIC pressure.

Osmotic pressure π=iCRT

For NaCl, the van 't Hoff factor i=2 as one NaCl molecule DISSOCIATES into 2 ions.

For urea, the van 't Hoff factor i=1 as urea does not dissociate.

6% W/V aqueous solution of urea means 6 g urea in 100 ML solution or

$$ 60 g urea in 1000 mL (1 L) solution.

60g/mol×1L

60 g

=1M

urea

×C

urea

NaCl

×C

NaCl

1× 1 M= 2×C

NaCl

=0.5 M