Why different colors and ptecipitates formed inthe cations of salt analysis?
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From what I’ve learnt in Qualitative Analysis (QA) and Acids Bases Salts (ABS), Yes , to an extent.
For example, Cu2+ ions are responsible for the colour of blue , as seen in Copper(II)Sulfate.
To test for Cu2+ ions, NaOH is used. A blue coloured solution is formed. When added in excess,a blue precipitate remains.
Transition metals are known to form coloured compounds. As seen from the periodic table, Nickel is a transition metal,and hence forms green coloured compounds.
Why do the colour of Nickel Nitrate differ between dry salt and aqueous solution?From my guess,it would be because of the presence of Water (H2O) ions in the aqueous solution,thus “diluting” the nickel nitrate,lightening the colour. Just my guess.
For example, Cu2+ ions are responsible for the colour of blue , as seen in Copper(II)Sulfate.
To test for Cu2+ ions, NaOH is used. A blue coloured solution is formed. When added in excess,a blue precipitate remains.
Transition metals are known to form coloured compounds. As seen from the periodic table, Nickel is a transition metal,and hence forms green coloured compounds.
Why do the colour of Nickel Nitrate differ between dry salt and aqueous solution?From my guess,it would be because of the presence of Water (H2O) ions in the aqueous solution,thus “diluting” the nickel nitrate,lightening the colour. Just my guess.
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