Question

A 10 g vial label says to add 25 mL of diluent to get 1 g per 2.5 mL. What concentration would you get if you added 35 mL?

Answer 1

A 10 g vial label says to add 25 mL of diluent to get 1 g per 2.5 mL. What concentration would you get if you added 35 mL?

Answer:

When 25 ml of diluent is used in 10 gm of the vial, we get

1 gm in 2.5 ml

Let assume x gm in 1 ml

1 gm---->2.5 ml

x gm------>1 ml

By cross multiplication we get,

1 gm x 1 ml=2.5 x x gm

x=0.4 gm in 1 ml

so in 2.5 ml, 1 gm of solute is present.

This above calculation is not necessary as already given in data, but it is for understanding purposes.

Dilution calculations can be performed using the formula

M1V1 = M2V2.

1 gm x 2.5 ml= M2 x 3.5 ml

M2= 1gm x2.5/3.5

=0.714 gm

So after adding 35 ml of diluent, we will get 0.7 gm in 3.5 ml of solution.

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