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Applications of Acids and Bases — Free MYP5 Chemistry Practice Questions
1QuestionAcids in Industry Cleaning Fertilizers Battery AcidConcept Practice
2 marks~3 minCriterion A
A car battery contains six cells, each holding lead dioxide plates, lead plates, and a liquid electrolyte.
(a) Identify the acid used as the electrolyte in a car battery, giving its chemical formula. [2]
(a) Identify the acid used as the electrolyte in a car battery, giving its chemical formula. [2]
Solutions
2QuestionBases in Everyday Products Soap Toothpaste Drain CleanersAssessment Practice
3 marks~5 minCriterion C
The bar chart below shows the time taken for drain cleaner (, a strong base) and soap (a mild base) to dissolve a fixed mass of grease. The saponification reaction is:
Drain cleaner dissolves the grease in 20 seconds; soap takes 100 seconds.
Drain cleaner dissolves the grease in 20 seconds; soap takes 100 seconds.
a
Describe the trend shown in the bar chart. [1]
b
Explain, using the concept of dissociation, why drain cleaner dissolves grease faster than soap. [1]
c
A student claims that doubling the concentration of the soap solution would make it dissolve grease at the same rate as drain cleaner. Evaluate this claim. [1]
Solutions
3QuestionRole of Acids and Bases in Environmental ChemistryAssessment Practice
5 marks~8 minCriterion D
A student investigates whether limestone () can neutralize sulfuric acid in a lake affected by acid rain. Two beakers each contain 500 mL of water at pH 4.0, adjusted with . Beaker A contains 10 g of limestone chips; Beaker B contains no limestone. pH is recorded every 2 hours for 24 hours. The graph below shows the results.
a
Write the balanced chemical equation for the reaction between limestone and sulfuric acid. [1]
b
Explain how this reaction accounts for the pH trend observed in Beaker A. [2]
c
Evaluate the hypothesis that limestone effectively neutralizes sulfuric acid in aquatic ecosystems, using both the experimental evidence and at least two limitations of the experimental design. [2]
Solutions
4QuestionpH Control in Agriculture and Swimming PoolsAssessment Practice
2 marks~3 minCriterion B
A farmer tests the effect of adding lime (calcium oxide) to three soil types. The pH of each soil is measured after adding 0 g, 5 g, and 10 g of lime.
Peat soil has a natural pH of 4.5 with 0 g of lime added.
| Lime added (g): 0 | 5 | 10 |
|---|---|---|
| Sandy soil pH: 5.0 | 6.0 | 7.0 |
| Clay soil pH: 5.5 | 6.5 | 7.5 |
| Loamy soil pH: 6.0 | 7.0 | 8.0 |
Peat soil has a natural pH of 4.5 with 0 g of lime added.
a
Deduce the relationship between the mass of lime added and the pH change observed across all three soil types. [1]
b
A farmer needs peat soil to reach a pH of at least 6.5 for optimal crop growth. Evaluate whether adding 10 g of lime is sufficient, and justify your answer using the pattern from the data. [1]
Solutions
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