Question

20 g salt is dissolved in water to prepare 20%

(w/w) aqueous salt solution. Calculate the amount

of salt added to this solution to make the final

concentration 30% (w/w). ​

Answer 1

Answer:

1Og

Explanation:

30(w/w),means 30g in 70g of solution.Therefore to make solution of 30 mass percentage 10g should be added to20mass percent solution

Answer 2

Answer:

30 g

Explanation:

Let's consider 100% as 100 g.

Therefore if 20 g of salt makes 20% w/w aqueous salt solution, then amount needed to make 30% w/w concentration

= 30/100*100

= 30 g