You are given three white powders: calcium carbonate, lead carbonate and zinc carbonate. Describe the tests you would carry out in solution to identify the metal ion in each of the above compounds using ${NH}_{4} OH$ solution.

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Solution

Identifying the metal ion by dissolving the given three white powders separately in Ammonium hydroxide $({NH}_{4} OH)$ solution:
Reaction with Calcium carbonate: small amount of Calcium carbonate $({CaCO}_{3})$ is dissolved in dilute Nitric acid and then add NH4OH to this solution, no reaction take place.
Reaction with Lead carbonate: small amount of Lead carbonate $({PbCO}_{3})$ is dissolved in dilute Nitric acid and then add NH4OH to this solution will give will give white gelatinous precipitate of Zinc hydroxide $Zn {(OH)}_{2}$ which is insoluble in excess of ammonium hydroxide.
The equation of the reaction is shown below:
${PbCO}_{3} + 2 {NH}_{4} OH \to Pb {(OH)}_{2} + {({NH}_{4})}_{2} {CO}_{3} Lead Ammonium Lead Ammonium carbonate carbonate hydroxide hydroxide$
Reaction with Zinc carbonate: small amount of Zinc carbonate $({ZnCO}_{3})$ is dissolved in dilute Nitric acid and then add ${NH}_{4} OH$ to this solution, will give white gelatinous precipitate of Zinc hydroxide $Z n {(OH)}_{2}$ which is insoluble in excess of Ammonium hydroxide.
The equation of the reaction is shown below:
${ZnCO}_{3} + 2 {NH}_{4} OH \to Zn {(OH)}_{2} + {({NH}_{4})}_{2} {CO}_{3} Zinc Ammonium Zinc Ammonium carbonate carbonate hydroxide hydroxide Zn {(OH)}_{2} + {({NH}_{4})}_{2} {CO}_{3} + 2 {NH}_{4} OH \to [Zn {({NH}_{3})}_{4}] {CO}_{3} ↓ + H_{2} O Zinc Ammonium white ppt . hydroxide carbonate$

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Q. You are given three white powders-calcium carbonate, lead carbonate and zinc carbonate. Describe the tests you would carry out in solution, to identify the metal ion in each of the above compounds. Indicate clearly how you would prepare the solutions for the test.

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Q. From the list of the substances given, name the substances which you would use to prepare each of the following salts:
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You are given three white powders: calcium carbonate, lead carbonate and zinc carbonate. Describe the tests you would carry out in solution to identify the metal ion in each of the above compounds using NH4OH solution.

You are given three white powders: calcium carbonate, lead carbonate and zinc carbonate. Describe the tests you would carry out in solution to identify the metal ion in each of the above compounds using ${NH}_{4} OH$ solution.