What volume of 9% NaCl solution is needed to make 100ml of a 0.9% NaCl solution

Question



Answer 1

In most chemistry courses, you learn to use the equation V1M1 = V2M2 when doing dilution problems.

V1 = initial volume = ?

M1 = original molarity or concentration = 9%

V2 = final volume = 100 ml

M2 = final molarity or concentration = 0.9%

(x ml)(9%) = (100 ml)(0.9%)

x ml = (100 ml )( 0.9%) / 9%

x = 10 mls

Answer 2

Suppose the volume is x

Volume of NaCl is 0.09 x

We need 0.09x / 100 = 0.009

0.09x = 0.9

x = 0.9 / 0.09 = 10

So 10 ml