新托福考试辅导_Net Ionic Equations

Ag⁺ + Br^-

AgBr

Example

Hydrochloric acid and sodium hydroxide are mixed. Write the net ionic equation.

Explanation

This is a mixture of a strong acid and a strong base, so each ionizes completely.

H⁺ + Cl^- + Na⁺ + OH^-

The two possible compounds formed are sodium chloride, which is soluble, and water, which is molecular; thus water is the only product in our net ionic equation.

H⁺ + OH^-

H₂O

Example

Chlorine gas is bubbled into a solution of potassium iodide; write the net ionic equation.

Explanation

This one is a single replacement, so you need to consider the activity series. Since halogens are involved, you can determine their activity by using the periodic table: Cl is more active than I.

Cl₂ + K⁺ + I^-

Remember that halogen is diatomic and that all potassium compounds are soluble. The resulting compound is also soluble, so K⁺ is a spectator and is left out of the final equation.

Cl₂ + I^-

I₂ + Cl^-

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