Chemical Changes
The year 10 students studying Separate Sciences have recently finished the Chemical Changes unit, which covers some of the fundamental building blocks of their understanding of chemical processes. As we are mastering some basic synthesis techniques, students have also started to do some analysis which they will build on in year 11. As part of this, they have been carrying out titrations, a key laboratory process which any A-level chemist’s amongst you will remember well.
What is a Titration?
A titration is a laboratory method used to determine the concentration of a solute (solid) in a solution (a liquid). It involves adding a titrant (a solution of known concentration) to a sample solution until a reaction is complete, which is usually indicated by a colour change. In school, we tend to use phenolphthalein which gives a very clear colour to bright pink. This process allows us to calculate the unknown concentration of the sample solution.
Why Do We Study Titrations?
Titrations are crucial for several reasons:
- Precision and Accuracy: Titrations are a precise method to determine concentrations, which is vital for chemical reactions requiring exact measurements.
- Real-World Applications: This technique is used in various industries. For example, in the pharmaceutical industry, titrations ensure the correct dosage of ingredients in medicines.
- Foundation for Advanced Study: Understanding titrations prepares students for more complex topics in A-level chemistry and beyond.
The Titration Process in Our Classroom
In our recent practical sessions, students have engaged in titrations using acid-base reactions. This build on their previous knowledge whilst also allowing us to recap concentration calculations from the Quantitative Chemistry unit. This revisiting of challenging content helps to secure this knowledge whilst allowing staff to identify students that need some extra support.
Mastering titrations is a significant achievement in our GCSE chemistry curriculum. As we progress, students will build on this knowledge to explore more complex chemical reactions and analytical techniques. This hands-on experience not only strengthens their understanding of chemistry but also enhances their problem-solving and analytical skills.
Mr Coogan
Teacher of Science
