Write a net ionic equation for the reaction that occurs when aqueous solutions of hydrofluoric acid and potassium hydroxide are combined.

H⁺(aq) + OH⁻(aq) ⇒ H₂O(l)

Explanation:

Let's consider the molecular equation that occurs when aqueous solutions of hydrofluoric acid and potassium hydroxide are combined. This is a neutralization reaction.

HF(aq) + KOH(aq) ⇒ KF(aq) + H₂O(l)

The complete ionic equation includes all the ions and molecular species.

H⁺(aq) + F⁻(aq) + K⁺(aq) + OH⁻(aq) ⇒ K⁺(aq) + F⁻(aq) + H₂O(l)

The net ionic equation includes only the ions that participate in the reaction and the molecular species.

H⁺(aq) + OH⁻(aq) ⇒ H₂O(l)

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

c, liquids evaporate, creating a gas