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CBSE Class 9 Answered

(a) What is meant by the statement "a 20 per cent solution of glucose"? (b) Calculate the amount of NaOH required to prepare 250g of 5% solution of NaOH by mass.
Asked by Topperlearning User | 03 Feb, 2015, 04:58: PM
answered-by-expert Expert Answer

(a) "a 20 percent solution of glucose" means that 20 grams of glucose is present in 100 grams of the solution.

(b) % of solution = 5

Mass of solution = 250g

 

Percentage of solution = Mass of solute / Mass of solution x 100

                               

                            5  = Mass of solute / 250  x 100

 

                               = 5 x 250 / 100

  

                               = 12.5 g


Answered by | 03 Feb, 2015, 06:58: PM

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