Question

How many grams of Na2SO3 are needed to prepare, five liters of 8% (w/w) solution having a density of 1.075 gm/cc.  Molar mass of Na2SO3 is 126.​

Answer 1

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of 8% (w/w) solution having a density of 1.075 gm/cc. Molar mass of Na2SO3 is 126.

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Answer:

Explanation:

The first thing that you need to do here is to use the density of the solution to determine the mass of

150 mL

of this hydrochloric acid solution.

The density of the solution is said to be equal to

1.1 g mL

−

1

, so right from the start, you know that every

1 mL

of solution will have a mass of

1.1 g

.

This means that your sample will have a mass of

150

mL

⋅

1.1 g

1

mL

=

165 g

Now, in order to find the solution's percent concentration by mass,

% m/m

, you need to figure out the mass of hydrochloric acid present in

100 g

of this solution.

Since you know that

165 g

of solution contain

30. g

of hydrochloric acid, you can say that

100 g

of this solution will contain

100

g solution

⋅

30. g HCl

165

g solution

=

18.18 g HCl

You can thus say that the solution has a percent concentration by mass equal to

% m/m = 18% HCl

−−−−−−−−−−−−−−−−−

The answer is rounded to two sig figs.

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