Multiple Choice
Which of the following represents the complete ionic equation for the reaction between Pb(NO3)2(aq) and KOH(aq)?
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6. Chemical Quantities & Aqueous Reactions
Complete Ionic Equations
Multiple Choice
Which of the following equations shows the complete dissociation of a strong base in water?
A
NH_3(aq) + H_2O(l) ightarrow NH_4^+(aq) + OH^-(aq)
B
Ca(OH)_2(s) ightarrow Ca(OH)_2(aq)
C
KOH(aq) ightarrow KOH(s)
D
NaOH(s) ightarrow Na^+(aq) + OH^-(aq)
Verified step by step guidance1
Step 1: Understand what complete dissociation means for a strong base in water. A strong base dissociates fully into its ions when dissolved in water, meaning it separates entirely into cations and hydroxide ions (OH⁻).
Step 2: Analyze each given equation to see if it represents a strong base fully dissociating into ions in aqueous solution. The equation should show the base in aqueous form (dissolved in water) and breaking down into its ions.
Step 3: For example, the equation for sodium hydroxide (NaOH) should be written as \(\mathrm{NaOH(aq) \rightarrow Na^{+}(aq) + OH^{-}(aq)}\), indicating it is dissolved in water and dissociates completely.
Step 4: Identify incorrect options: equations showing solids without dissolution, or weak bases like ammonia (NH₃) which do not fully dissociate, are not correct representations of complete dissociation.
Step 5: Conclude that the correct equation must show the strong base in aqueous form dissociating fully into its ions, such as \(\mathrm{NaOH(s) \rightarrow Na^{+}(aq) + OH^{-}(aq)}\) after dissolution, but properly written with (aq) on the reactant side to indicate it is dissolved.
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