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State one relevant observation for each ...

State one relevant observation for each of the following :
Barium chloride solution is slowly added to sodium sulphate solution.

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Barium chloride solution is slowly added to sodium sulphate solution to obtain white precipitate of barium sulphate :
`BaCl_2(aq) + Na_2SO_4(aq) rarr BaSO_4(s) + 2NaCl(aq)`
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