Question

Identify cation and anion from the following salt calcium carbonate

Answer 1

calcium is cation and carbonate is anion

Answer 2

Calcium cation, present like barium in the second group of elements in the periodic table,

forms bivalent ions. Calcium compounds are commonly found in nature as minerals, mostly in forms  of calcium carbonate CaCO3 (chalk)

While heating the platinum wire with calcium salt solution in a flame, as the result of calcium

ion electrons excitation, change the flame color to reddish-brown is observed.

Procedure: Anneal the platinum wire in the laboratory burner flame until the flame becomes colorless.

Then immerse the wire in calcium salt solution and put it back to the flame again. Observe the

change of color flame to reddish-brown.

2. BaCl₂ + H₂SO₄ ------>  Ba₂SO₄ + 2 HCl

While heating the platinum wire with barium salt solution in a flame, as the result of barium

ion electrons excitation, change the flame color to green is observed.

Procedure: Anneal the platinum wire in the laboratory burner flame until the flame becomes colorless.

Then, dip the wire into the barium salt solution and put it back into the flame. Observe a green color

of the flame.

5.  Potassium ferrocyanide [hexacyanoferrate (II)] forms with ferric ions [Fe3+] a dark-blue  precipitate of ferric ferrocyanide (Prussian blue).

            4 FeCl₃ + 3 K₄[Fe(CN)₆] -----------> Fe₄[Fe(CN)₆]₃ + 12 KCl

Prussian blue

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