Multiple Choice
What is the net ionic equation for the reaction between MgSO4(aq) and Ba(NO3)2(aq)?
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6. Chemical Quantities & Aqueous Reactions
Complete Ionic Equations
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Which ions are spectator ions in the reaction between Mg(OH)_2 (aq) and HCl (aq)?
A
OH^-
B
Cl^-
C
Mg^{2+}
D
H^+
Verified step by step guidance1
Step 1: Write the balanced molecular equation for the reaction between magnesium hydroxide and hydrochloric acid: \(\mathrm{Mg(OH)_2 (aq) + 2HCl (aq) \rightarrow MgCl_2 (aq) + 2H_2O (l)}\).
Step 2: Write the complete ionic equation by dissociating all strong electrolytes into their ions: \(\mathrm{Mg^{2+} (aq) + 2OH^- (aq) + 2H^+ (aq) + 2Cl^- (aq) \rightarrow Mg^{2+} (aq) + 2Cl^- (aq) + 2H_2O (l)}\).
Step 3: Identify the ions that appear unchanged on both sides of the ionic equation. These ions do not participate in the formation of the precipitate or water and are called spectator ions.
Step 4: From the ionic equation, observe that \(\mathrm{Mg^{2+}}\) and \(\mathrm{Cl^-}\) ions appear on both sides without change, while \(\mathrm{OH^-}\) and \(\mathrm{H^+}\) ions react to form water.
Step 5: Conclude that the spectator ions in this reaction are the ions that remain in solution unchanged, which are \(\mathrm{Mg^{2+}}\) and \(\mathrm{Cl^-}\).
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