Given the reaction: Ba(OH)2(aq) + H2SO4(aq) BaSO4(s) + 2 H2O(l) + energy...?

Question

As the barium hydroxide solution is added to the solution of sulfuric acid, the electrical conductivity of the acid solution decreases because the:

-volume of the reaction mixture increases
-temperature of the reaction mixture decreases
-concentration of ions increases
-concentration of ions decreases

Answer 1

Since the barium-sulphate has precipitated the concentration of ions has decreased and conductivity decreases. Because the conductivity mostly depends on H+ ions (because they are smalles ions and have electrical density very high, they are most moveable ions), when you decrease their concentration the conductivity will decrease.

Answer 2

Concentration of ions decreases. Ba++ + SO4= ===> BaSO4(s). Also, 2H+ + OH- ===> H2O (a slightly ionized substance).

Answer 3

I can only imagine it would be because of a decrease in soluble ions - notice that Barium sulfate percipitates and thus does not dissociate and water's autoionization is very much negligible