The density of a 20% by mass solution of sulphuric acid is 1.14g/mL. Calculate the mass of hydrogen sulphate in one litre of the solution. ?

1 Answer
anor277
Jul 15, 2018

Well, what is the mass of #1*L# of this solution....?

Explanation:

Well, we are given the density....and so...

#"mass of solution"=1*Lxx1000*mL*L^-1xx1.14*g*mL^-1#

#-=1140*g#...OF WHICH 20% by mass is #H_2SO_4#...

And so #[H_2SO_4]=((1140*gxx20%)/(98.08*g*mol^-1))/(1*L)=2.33*mol*L^-1#...

Sulfuric acid is of course diprotic in aqueous solution...

#H_2SO_4(aq) +H_2O(l) rarr HSO_4^(-) + H_3O^+#

#HSO_4^(-) +H_2O(l) rarr SO_4^(2-) + H_3O^+#

The first reaction is to all intents and purposes quantitative. The second reaction lies to the right as we face the page. We have no data to address the extent of the equilibrium....

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