OCR AS Biology

Revision Notes

1.2.14 Serial Dilutions

Serial Dilutions

  • Serial dilutions are created by taking a series of dilutions of a stock solution. The concentration decreases by the same quantity between each test tube
    • They can either be ‘doubling dilutions’ (where the concentration is halved between each test tube) or a desired range (e.g. 0, 2, 4, 6, 8, 10 mmol dm-3)
  • Serial dilutions are completed to create a standard to compare unknown concentrations against
    • The comparison can be:
      • Visual
      • Measured through a calibration/standard curve
      • Measured using a colourimeter
    • They can be used when:
      • Counting bacteria or yeast populations
      • Determining unknown glucose, starch, protein concentrations

2.1 The Benedict’s test - Serial dilutions, downloadable IGCSE & GCSE Biology revision notes

Making serial dilutions

Close

Join Save My Exams

Download all our Revision Notes as PDFs

Try a Free Sample of our revision notes as a printable PDF.

Join Now
Already a member?
Go to Top