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APPLE JUICE INVESTIGATION PROCEDURE

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EXPERIMENT 3F Determination of Vitamin C Concentration (This experiment is done individually.)

Useful background reading (this is not compulsory but may be helpful):

Tro, 4th and 5th Edition: Sections 7.9, 13.6 (repeat), 2.5 (repeat) – Introduction and all Questions

What is the relevance of this prac…?

The last quantitative techniques experiment demonstrated the importance of acquiring

laboratory skills. The better your laboratory skills, the more accurate and precise your

results and therefore the more useful and significant they are. This may seem fairly

unimportant in a first year practical but our environment, our health and our safety depend

every day on the skills of scientists in the medical, transport, food production and energy

sectors, just to name a few.

Scientists depend on their analytical skills for their livelihood and society depends on these

skills in order to live their day-to-day lives. This experiment provides a real-world example of

how laboratory skills are used in industry. These exact quantitative techniques were used to

discredit GlaxoSmithKline – the major company responsible for manufacturing the popular

fruit drink, Ribena.

Learning objectives (remember these are different to the scientific objectives):

On completion of this practical, you should have:

 Become more proficient with the technique of titration (pipetting and buretting).

 Become aware that chemical reactions are grouped into categories that have similar

chemical features. Two such examples are acid-base reactions and redox reactions.

 Successfully prepared a standard solution using correct technique.