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Applications of Acids and Bases — Free MYP4 Chemistry Practice Questions
1QuestionpH Control in Agriculture and Swimming PoolsConcept Practice
2 marks~3 minCriterion A
A diagram shows three pH-testing methods: a pH meter probe, a strip of universal indicator paper, and a piece of red litmus paper.
An agricultural scientist needs to determine the exact pH of a soil sample to decide whether lime should be added before planting.
An agricultural scientist needs to determine the exact pH of a soil sample to decide whether lime should be added before planting.
a
Identify the apparatus from the diagram that provides an accurate numerical pH value. [1]
b
Explain why the other two methods are unsuitable for this purpose. [1]
Solutions
2QuestionSafety and Storage of Corrosive SubstancesAssessment Practice
2 marks~3 minCriterion D
A laboratory technician finds an unlabelled bottle containing on a bench next to an eyewash station. The bottle is missing its GHS hazard symbol.
a
Identify the GHS hazard symbol that must appear on the bottle of , and state what the symbol indicates about the substance. [1]
b
Explain why an eyewash station, rather than a standard tap, is the appropriate first-aid response if contacts a student's eyes. [1]
Solutions
3QuestionBases in Everyday Products Soap Toothpaste Drain CleanersAssessment Practice
5 marks~8 minCriterion C
Four household products are tested: soap, toothpaste, drain cleaner, and an unknown substance labelled X. The table below shows the pH, reaction with 1.0 M HCl (droplet test), reaction with 1.0 M NaOH (droplet test), and conductivity of a 1% solution at 25°C.
Product: Soap, Toothpaste, Drain cleaner, X
pH: 9, 8, 13, 11
Reaction with HCl: Fizzes mildly, Fizzes mildly, Vigorous fizzing, Fizzes moderately
Reaction with NaOH: No visible change, No visible change, No visible change, No visible change
Conductivity: Low, Low, High, Moderate
a
[2 marks] Deduce which of the four products is the strongest base. Explain your reasoning using the pH data and the reaction with HCl.
b
[3 marks] Deduce the identity of substance X. Justify your deduction by comparing all three properties (pH, reaction with HCl, and conductivity) to the known products.
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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