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Dilution

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Workshop 5: Connect the dots: Can your dilution make a perfect line?

We all know that molecules are too small to be seen so we’re often in the dark about what a sample consists of, how pure it is or how quickly it’s reacting. With spectrophotometry we can use light to ‘see’ all of these aspects, spectrophotometry is therefore a widely used technique. Working in small teams we extracted chlorophyll from spinach, then used serial dilution to prepare a range of samples of known concentrations. Spectrophotometric analysis of these samples allowed us to construct a standard curve, we could then use this to work out the concentration of an unknown sample.

This workshop was good for

  • Understanding how spectrophotometry works
  • Practising extraction techniques and serial dilutions
  • Establishing good spectrophotometer technique
  • Constructing standard curves and understanding how to use them

Find out more and register to attend a session today by visiting our registration page .

Want to know more about spectrophotometry before attending the workshop? Check out these videos on spectrophotometry and standard curves.

To contact the Kitchen Chemistry team email success.health@qut.edu.au .

Workshop 3: Making Potions – Solutions and Dilutions

We’re all used to using solutions and dilutions in our daily lives – making a good strength gin and tonic or diluting Ribena with water for example. Getting concentrations and dilutions right is vital for health and science students, this article highlights just how important this skill is. In this workshop we individually made a series of solutions, including a master mix, before practising dilutions.

After this workshop would your skills be up to making the ideal martini? Check out this video to see how it’s done.

This workshop was good for:

  • Understanding the different units we use to describe concentration, including molarity
  • Appreciating the common mistakes when preparing solutions and knowing how to avoid them
  • Practising pipetting accurately
  • Understanding how to make, and why we use, master mixes
  • Calculating (using C1V1 = C2V2) volumes required for, and making, dilutions

Find out more and register to attend a session today by visiting our registration page .

To contact the Kitchen Chemistry team email success.health@qut.edu.au