Apentix/AP Chemistry/Unit 4: Chemical Reactions/Question

AP Chemistrymediummcq1 pt

What is the net ionic equation for mixing aqueous Ba(OH)₂ with aqueous H₂SO₄?

A.Ba²⁺(aq) + 2OH⁻(aq) + 2H⁺(aq) + SO₄²⁻(aq) → BaSO₄(s) + 2H₂O(l)

B.Ba²⁺(aq) + SO₄²⁻(aq) → BaSO₄(s)

C.H⁺(aq) + OH⁻(aq) → H₂O(l)

D.Ba(OH)₂(aq) + H₂SO₄(aq) → BaSO₄(s) + 2H₂O(l)

Explanation

Core Concept

Two things happen at once: barium sulfate precipitates, and hydronium meets hydroxide to form water. Keeping every participating ion displays both driving forces in a single expression. Only the true spectators cancel, leaving an equation balanced in both atoms and charge, which is the defining test of a properly written net ionic equation.

Correct Answer

ABa²⁺(aq) + 2OH⁻(aq) + 2H⁺(aq) + SO₄²⁻(aq) → BaSO₄(s) + 2H₂O(l)

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