MHT CET2009ChemistrySome Basic Concepts of Chemistry
The percentage (by weight) of sodium hydroxide in a 1.25 molal NaOH solution is
Options
- A4.76 %
- B1.25 %
- C5 %
- D40 %
Correct answer
A. 4.76 %
Step-by-step solution
1.25 molal NaOH solution means, 1.25 moles of NaOH are present in 1000 ~g of water Weight of NaOH =1.25 40=50 ~g Weight of solution =1000+50=1050 ~g % (by weight) of NaOH array l = wt. of solute wt. of solution 100 = 50 1050 100=4.76 % array