Question

1. A substance Y gives a reddish brown ppt with limited amount of Sodium hydroxide ammonium hydroxide solution and on addition of excess ppt is insoluble .Identify the cation in Y.

2. A substance Z gives a blue ppt with limited amount of ammonium hydroxide solution and on treatment with excess alkali ppt dissolves forming an inky blue solution. Identify the cation in Z.

3. A salt that gives a white coloured ppt with limited sodium hydroxide/ammonium hydroxide solution and ppt is soluble in excess of sodium hydroxide ppt is soluble whereas ppt is insoluble in excess of ammonium hydroxide.

4. A salt that gives a blue ppt with sodium hydroxide solution and in excess ppt is insoluble.

5. A salt that gives a white ppt with limited amount of ammonium hydroxide solution and in excess ppt is insoluble.

[Wrong/Vague answers are ignored]
[Need correct answers, with perfect explanation]

Answer 1

❒Statement 1 Says:

A substance Y gives a reddish brown ppt with limited amount of Sodium hydroxide ammonium hydroxide solution and on addition of excess ppt is insoluble .Identify the cation in Y.

✪Possible Answer:

Substance Y=Iron(Fe)

The Ionic Reaction Result=Iron Sulphate(FeSO4)

❒Statement 2 Says:

A substance Z gives a blue ppt with limited amount of ammonium hydroxide solution and on treatment with excess alkali ppt dissolves forming an inky blue solution. Identify the cation in Z.

✪Possible Answer:

Substance Z=Copper (Cu)

The Ionic Reaction Result=Copper Sulphate (CuSO4)

✬Extended Shot: Copper Sulphate Could be displaced by Iron resulting Iron Sulphate

❒Statement 3 Says:

A salt that gives a white coloured ppt with limited sodium hydroxide/ammonium hydroxide solution and ppt is soluble in excess of sodium hydroxide ppt is soluble whereas ppt is insoluble in excess of ammonium hydroxide.

✪Possible Answer:

Salt=Magnesium

Reaction Result=Magnesium Oxide

Solubility=Insoluble in Some Cases but usually dissolve in water.

❒Statement 4 Says:

salt that gives a blue ppt with sodium hydroxide solution and in excess ppt is insoluble.

✪Possible Answer:

Copper chloride gives a blue precipitate of Cu(OH)2 with sodium hydroxide solution.

❒Statement 5 Says:

A salt that gives a white ppt with limited amount of ammonium hydroxide solution and in excess ppt is insoluble.

✪Possible Answer:

Magnesium hydroxide

[Short term used:-ppt➙precipitate(A separable solid substance from a Solution)]

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Answer 2

Answer:

1. The reddish-brown precipitate formed with limited sodium hydroxide/ammonium hydroxide solution and insoluble in excess is characteristic of iron (III) cation. So, the cation in substance Y is Fe3+.
2. The blue precipitate formed with limited ammonium hydroxide solution and dissolves in excess to form an inky blue solution is characteristic of copper (II) cation. So, the cation in substance Z is Cu2+.
3. The salt that gives a white precipitate with limited sodium hydroxide/ammonium hydroxide solution and the precipitate is soluble in excess of sodium hydroxide while insoluble in excess of ammonium hydroxide is characteristic of calcium cation. So, the cation in the salt is Ca2+.
4. The blue precipitate formed with sodium hydroxide solution and insoluble in excess is characteristic of copper (II) cation. So, the cation in the salt is Cu2+.
5. The white precipitate formed with limited ammonium hydroxide solution and insoluble in excess is characteristic of aluminum cation. So, the cation in the salt is Al3+.