Write the balanced net ionic equation for the reactions that occur when the given aqueous solutions are mixed. Include the physical states. A. nitric acid, HNO 3, and calcium hydroxide, Ca (OH) 2 net ionic equation: B. lead (II) nitrate, Pb (NO 3) 2, and potassium iodide, KI

a. 2 H⁺ (aq) + 2 OH⁻ (aq) → 2H₂O (l)

b. Pb²⁺ (aq) + 2I⁻ (aq) → PbI₂ (s)

Explanation:

First of all, we must determine if the reactants produce precipitates:

A. HNO₃, Ca (OH) ₂

B. Pb (NO₃) ₂, KI

A. This is a neutralization reaction:

Acid + Base → Water and Salt

The net ionic equation shows, that water is produced

We dissociate the compounds:

HNO₃ → H⁺ (aq) + NO₃⁻ (aq)

Ca (OH) ₂ (aq) → Ca²⁺ (aq) + 2OH⁻ (aq)

Ionic complete equation:

2H⁺ (aq) + 2NO₃⁻ (aq) + Ca²⁺ (aq) + 2OH⁻ (aq) → Ca²⁺ (aq) + 2NO₃⁻ (aq) + H₂O (l)

Net ionic equation: 2 H⁺ (aq) + 2 OH⁻ (aq) → H₂O (l)

B. Pb (NO₃) ₂, KI

We dissociate: Pb (NO₃) ₂ (aq) → Pb²⁺ (aq) + 2NO₃⁻ (aq)

KI (aq) → K⁺ (aq) + I⁻ (aq)

Salts from nitrate are soluble but, when the iodide reacts, it can make a lead iodide precipitate

Ionic complete equation:

Pb²⁺ (aq) + 2NO₃⁻ (aq) + K⁺ (aq) + 2I⁻ (aq) → K⁺ (aq) + 2NO₃⁻ (aq) + PbI₂ (s)

Net ionic equation: Pb²⁺ (aq) + 2I⁻ (aq) → PbI₂ (s)

We cancel the repeated ions