Question

what mass of anhydrous sodium carbonate can be dissolved in 250cm3 of water to make a 2M solution of sodium carbonate​

Answer 1

We know that,

Molarity =

M×V

w

where, w = mass of Na

2

CO

3

in g,

M = molecular mass of Na

2

CO

3

in gram = 106

V = volume of solution in litre =

1000

250

=0.25

Molarity =

10

1

Hence, 101

= 106×0.25w

or

w= 10

106×0.25

=2.65g