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Molarity

For each solu...

Question

For each solution, identify the ions that exist in aqueous solution and specify the concentration of ion having the highest concentration in $x$ $\times 10^{- 2} M$ .

(a) $0.25 M (N H_{4})_{2} S O_{4}$ .
(b) $0.123 M N a_{2} C O_{3}$ .
(c) $0.056 M H N O_{3}$ .

What is the value of $x$ ?

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Solution

(a) $(N H_{4})_{2} S O_{4} \to 2 N H_{4}^{+} + S O_{4}^{2 +}$
Thus, the solution will contain ammonium ion and sulfate ion.
The concentration of the ammonium ions will be $2 \times 0.25 M = 0.50 M = 50 \times 10^{- 2} M$ .
The concentration of sulfate ions will be $0.25$ M.
(b) $N a_{2} C O_{3} \to 2 N a^{+} + C O_{3}^{2 -}$
Thus, the solution will contain sodium ions and carbonate ions.
The concentration of sodium ions will be $2 \times 0.123 M = 0.246 M$
The concentration of the carbonate ions will be $0.123$ M.

(c) $H N O_{3} \to H^{+} + N O_{3}^{-}$
Thus, the solution will contain protons and nitrate ions.
The concentration of protons and nitrate ions will be $0.056$ M each.

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