Question

Specify what ions are present in solution upon dissolving each of the following substances in water.

FeCl2
HNO3
(NH4)2SO4
Ca(OH)2

Answer 1

Answer:

The answer to your question is below

Explanation:

Ions is a molecule with a charge

Cations are ions with a positive charge

Anions are ions with a negative charge

FeCl2                     Fe⁺²   Iron (II)                  +      2Cl⁻¹        Chloride

HNO3                    H⁺¹      Hydrogen            +      NO₃⁻¹       Nitrate

(NH4)2SO4        2NH₄⁺¹  Ammonium          +      SO₄ ⁻²      Sulphate

Ca(OH)2              Ca⁺²    Calcium                +    2OH⁻¹        Hydroxide

Answer 2

Answer:

FeCl₂ → Fe²⁺ + Cl⁻

HNO₃ → H⁺ + NO₃⁻

(NH₄)₂SO₄ → NH₄⁺ + SO₄²⁻

Ca(OH)₂ → Ca²⁺ + OH⁻

Explanation:

Each of these given compounds will dissociate into cations and anions upon dissolution in water. The compounds and constituent species are tabulated as under:

Compound                                         Cation                             Anion

FeCl₂ (Ferrous chloride)                     Fe²⁺ (Ferrous)                Cl⁻ (Chloride)  

HNO₃ (Nitric acid)                               H⁺ (Hydron)                    NO₃⁻ (Nitrate)

(NH₄)₂SO₄ (Ammonium sulfate)         NH₄⁺ (Ammonium)         SO₄²⁻ (Sulphate)

Ca(OH)₂ (Calcium hydroxide)             Ca²⁺ (Calcium)               OH⁻ (Hydroxide)

Each of these compounds is made up of cations and anions but by convention while writing a chemical formula a cation is written first followed by an anion.