Question

What mass of water must be added to 5g of sodium chloride to make 5% mass by mass percentage of the solution?

Answer 1

Answer:

95 g of water must be added.

Answer 2

Answer:

95 grams of solvent (water)

Explanation:

Mass of solute = 5 grams

Mass/Mass% of solute in the solution = 5%

Let mass of Water be x

Hence, Mass of the solution = Mass of solute + Mass of solvent

=(5+x) grams

We know that,

Mass/Mass% =

$\frac{mass \: of \: solute \: }{ \\ mass \: of \: solution \: } \times 100$

=

$5 = \frac{5 \: grams}{5 + x \: grams} \times 100$

=

$5 + x = \frac{5 \times 100}{5}$

= 5+x = 100

= x = 100-5

= 95 grams

Therefore 5g of sodium chloride must be added to 95g of water to make a 5% mass/mass% solution