Neutralization Reactions
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Neutralization Reactions — Free MYP4 Chemistry Practice Questions

1QuestionDefinition and Real-Life Examples of NeutralizationConcept Practice
2 marks~3 minCriterion A
An antacid tablet containing calcium carbonate (CaCO3CaCO_3) is added to a beaker of stomach acid (hydrochloric acid, HClHCl). The tablet dissolves, releasing bubbles of carbon dioxide gas (CO2CO_2).
a
Identify the base in this neutralization reaction. [1]
b
Identify the salt produced in this neutralization reaction. [1]
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Solutions

2QuestionpH Changes During NeutralizationAssessment Practice
2 marks~3 minCriterion D
In many regions, agricultural soils become acidic due to rainfall and fertiliser use, reducing crop yields. A farmer tests the soil and finds a pH of 4.5. She applies calcium hydroxide, Ca(OH)2Ca(OH)_2, to raise the soil pH toward the optimal range of 6.0–7.0 for most crops.
a
Explain how applying Ca(OH)2Ca(OH)_2 to acidic soil raises its pH, referring to the neutralization reaction that occurs. [1]
b
Identify one environmental risk of over-applying Ca(OH)2Ca(OH)_2 to agricultural soil, and explain the chemical or ecological mechanism by which this risk arises. [1]
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Solutions

3QuestionWord and Symbol Equations for NeutralizationConcept Practice
3 marks~5 minCriterion B
Four neutralization reactions and their salt products are shown below.

Acid: hydrochloric acid (HCl\text{HCl})Base: sodium hydroxide (NaOH\text{NaOH})Salt: sodium chloride
Acid: sulfuric acid (H2SO4\text{H}_2\text{SO}_4)Base: potassium hydroxide (KOH\text{KOH})Salt: potassium sulfate
Acid: nitric acid (HNO3\text{HNO}_3)Base: calcium hydroxide (Ca(OH)2\text{Ca(OH)}_2)Salt: calcium nitrate
Acid: phosphoric acid (H3PO4\text{H}_3\text{PO}_4)Base: sodium hydroxide (NaOH\text{NaOH})Salt: sodium phosphate
a
Identify the pattern used to name the salts produced in neutralization reactions. [1]
b
Deduce the name of the salt formed when hydrobromic acid (HBr\text{HBr}) reacts with magnesium hydroxide (Mg(OH)2\text{Mg(OH)}_2). [1]
c
Construct the word equation for the neutralization reaction between hydrobromic acid and magnesium hydroxide. [1]

Solutions

4QuestionWord and Symbol Equations for NeutralizationAssessment Practice
5 marks~8 minCriterion C
A student mixes hydrochloric acid (HClHCl) with sodium hydroxide (NaOHNaOH) solution in a beaker. The mixture contains freely moving H+H^+, Cl−Cl^-, Na+Na^+, and OH−OH^- ions before the reaction occurs.
a
Construct the balanced word equation for the reaction between hydrochloric acid and sodium hydroxide. [1]
b
Construct the balanced symbol equation for this reaction, including state symbols. [2]
c
The student claims that the ionic equation H+(aq)+OH−(aq)→H2O(l)H^+(aq) + OH^-(aq) \rightarrow H_2O(l) represents every neutralization reaction between a strong acid and a strong alkali, not just this one. Evaluate this claim. [2]
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Solutions

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