Question

balancing equations:
1. barium chloride and sodium sulphate gives barium sulphate and sodium chloride

Answer 1

BaCl2 + Na2SO4 (reactants) -------------->   BaSO4 + NaCl (products)
here on reactants side Barium (Ba), Sulphur and Oxygen are already balanced with products side
But Chlorine (Cl) and Sodium(Na) aren't balanced on 2 sides. because there are 2 Cl atoms and Na are there on reactants side
In order to balance them we have to keep 2 before NaCl on products side
So, keep 2 before Nacl
Now they are balanced and hence the balanced equation is:
BaCl2 + Na2SO4 --------> BaSO4+2NaCl

Answer 2

Answer:

A white ppt. ( precipitate ) is formed.

Na₂SO₄ ( aq ) + BaCl₂ ( ag ) ⇒  2 NaCl ( aq ) + BaSO₄ ( ↓ )

Doubled Displacement reaction

The reaction in which there is an exchange of ions between the reactants.