Question

When preparing 1L of a 14% NaCl solution using a 20% NaCl solution and a 0.9% NaCl solution, how many mL of the 20% solution are needed?

Answer 1

To prepare 1 ltr of 14% NaCl solution, 700 ml of 20 % Nacl solution will be mixed with 300 ml of water.

What is percentage composition ?

The percent composition of a compound is the mass percent of each element in the compound.

To prepare ;

14 % NaCl Solution, Which means 140 gm of NaCl in 1000 ml solution.

Given Slolution ;

20% NaCl solution, Which means 200 gm of NaCl in 1000 ml Solution.

We need 140gm of NaCl from above solution

If 1000 ml consist of 200 gm NaCl

then, X ml will contain 140 gm of Nacl ;

140 / x = 200 / 1000

Therefore,

x = 1000 x 140 / 200

  = 700 ml of Nacl solution of 20%.

Hence, 700 ml of 20% solution are needed to mix 300 ml of water to make 1L of a 14% NaCl solution.

Learn more about percentage composition here ;

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