A student in Jamaica tested the pH of soil samples from three different locations using universal indicator paper. To improve the accuracy of the pH measurements, the student should:

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Question

A student in Jamaica tested the pH of soil samples from three different locations using universal indicator paper. To improve the accuracy of the pH measurements, the student should:

Accepted Answer

Use a pH meter or pH probe instead of indicator paper — Award 1 mark for 'Use a pH meter or pH probe instead of indicator paper'. Accuracy refers to how close a measurement is to the true value. A pH meter gives more precise numerical readings and is more accurate than estimating pH from colour changes on indicator paper. A is incorrect because repeating measurements improves reliability, not accuracy. C is incorrect because dilution would change the pH being measured. D is incorrect because paper size does not affect the accuracy of the colour-matching process.

Answer

Add more water to each soil sample before testing

Answer

Test each soil sample five times and calculate a mean pH

Answer

Use a larger piece of universal indicator paper

Answer

Use a pH meter or pH probe instead of indicator paper

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