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Laboratory Techniques
Quick questions on Serial dilution and concentration: O-Level Laboratory Techniques
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is dilution factor?Show answer
The dilution factor tells you how many times more dilute the sample is than the original.
What is calculating the original number?Show answer
To find the number of cells per millilitre in the original culture:
What is q1?Show answer
State the total dilution factor of four tenfold dilution steps. [1 mark]
What is q2?Show answer
A sample of a culture diluted times grows colonies. Find the number of bacteria per millilitre in the original. [3 marks]
What is q3?Show answer
Explain why a culture is diluted before the bacteria are counted on a plate. [2 marks]
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