Please show calculations if any. thanks 1. Identify the reagent (and its concent

Question

Please show calculations if any. thanks

1. Identify the reagent (and its concentration) that is used to confirm the presence of each of the following: a. Ni b. Fe 2. Confirmatory tests for the various ions are often colorful. ldentify the confirmatory compound/ion and the color f each of the following ions: IonConfirmatory Compound/on Fe Ni2. Al- Color 3. Identify the reagent that separates a. Fe from Zn Explain the chemistry of the separation h. Fe from Ni. Explain the chemistry of the separation. c. Al. from Zn". Explain the chemistry of the separation.

Explanation / Answer

1. Ni2+ - The presence of Ni2+ in aqueous solution is confirmed by adding dimethylglyoxime(C4H8N2O2) resulting in the formation of a rose red precipitate.

Fe3+ - To confirm the presence of Fe3+, red Fe(OH)3 precipitate is dissolved in HCl(aq) and then KSCN is added to the solution. The positive result is the formation of a dark red solution indicating the presence of Fe(SCN)2+

Zn2+ - Add a few drops of sodium hydroxide solution to the test solution.

white precipitate confirm the presence of Zn2+ ions.

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