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QualitativeAnalysis+

Qualitative Analysis, Cations only

QuestionAnswer
When using sodium hydroxide solution NaOH what effect does it have on calcium, Ca 2+? When NaOH is added dropwise a white precipitate is formed and when NaOH is in excess the precipitate does not dissolve.
When using sodium hydroxide solution NaOH what effect does it have on Pb 2+ Al 3+ Zn 2+? When NaOH is added dropwise a white precipitate forms and when the NaOH is added in excess the white precipitate dissolves forming a colourless solution.
When using sodium hydroxide solution NaOH what effect does it have on Cu 2+? When the NaOH is added dropwise a blue precipitate is formed and the precipitate does not dissolve in the excess NaOH.
When using sodium hydroxide solution NaOH what effect does the NaOH have on the Fe 2+? When the NaOH is added dropwise a green precipitate is formed and does not dissolve in excess NaOH.
When using sodium hydroxide solution NaOH what effect does it have on Fe 3+? A red brown precipitate is formed when the NaOH is added dropwise and when added in excess the precipitate does not dissolve
When using sodium hydroxide solution NaOH what effect does it have on NH4 +? No precipitate is formed when the NaOH is added dropwise while on warming a pungent smell is detected and it turns moist/damp red litmus paper blue
When using ammonia solution or ammonium hydroxide NH4OH what effect does it have on Ca 2+? There is no effect on calcium 2+ when the ammonia solution is added dropwise.
When using ammonia solution or ammonium hydroxide NH4OH what effect does it have on Al 3+ and Pb 2+? A white precipitate is formed when the ammonia solution is added dropwise but in excess the precipitate does not dissolve.
When using ammonia solution or ammonium hydroxide NH4OH what effect does it have on Zn 2+? A white precipitate is formed when the NH4OH is added dropwise and in excess the precipitate dissolves and forms a colourless solution.
When using ammonia solution or ammonium hydroxide NH4OH what effect does it have on Cu 2+? A blue precipitate is formed when the NH4OH is added dropwise and in excess the precipitate dissolves forming a deep blue solution
When using ammonia solution or ammonium hydroxide NH4OH what effect does it have on Fe 2+? When NH4Oh is added dropwise to Fe 2+ a green precipitate forms but when added in excess the precipitate does not dissolve.
When using ammonia solution or ammonium hydroxide NH4OH what happens to Fe 3+? A red-brown precipitate is formed when the ammonium hydroxide is added dropwise but when it is added in excess the precipitate does not dissolve.
When using potassium iodide solution, KI, what happens to Pb 2+? A bright yellow precipitate is formed when the potassium iodide solution is added to the lead 2+ solution.
When using potassium iodide solution, KI, what happens to Al 3+? No precipitate is formed when the potassium iodide solution is added to the aluminium 3+ solution.
Created by: HakeemT
 

 



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