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Double Displacement Reaction

Identify the ...

Question

Identify the cation present in the reaction
NaOH solution when added to solution (C) gives white precipitate which is insoluble in excess?

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Solution

When Sodium hydroxide(NaOH) reacts with Calcium nitrate(Solution C) , then a double displacement reaction takes place , Sodium nitrate(NaNO₃) and Calcium hydroxide(Ca(OH)₂) is formed out of which Calcium hydroxide precipitates down as white precipitate which is insoluble in excess of Sodium hydroxide solution.
2NaOH(aq) + Ca(NO₃)₂(aq) ⇢ Ca(OH)₂ ⇣ + 2NaNO₃ (aq)
The cation present is Ca²⁺ ion.

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Q. (a) Sodium hydroxide solution is added to solution A. A white precipitate is formed which is insoluble in excess sodium hydroxide solution. Name the metal ion present in solution A.
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