Why do aqueous solution of H2SO4 and BA(OH)2 act as strong electrolytes individually, but after they are mixed

together, they act as a week electrolyte?

Answer:
The reaction is :
H2SO4 (aq) + Ba(OH)2 (aq) >> BaSO4 (s) + 2 H2O (l)
net ionic equation :
SO42- (aq) + Ba2+ (aq) >> BaSO4 (s)
BaSO4 is a slightly soluble salt

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