Food tests Biology Edexcel GCSE
Test for sugar - correct answer Benedict's test
How to do sugar test - correct answer Add Benedict's reagent to sample, heat
in water bath to 75 degrees
Results for sugar test - correct answer Positive = coloured precipitate brick
red. Negative = stay blue
Test for starch - correct answer Iodine solution
How to do starch test - correct answer Add iodine to sample and view results
Results for starch test - correct answer Positive = blue-black. Negative =
browny-orange
Test for lipids - correct answer Emulsion test
How to do emulsion test - correct answer Shake sample with ethanol until it
dissolves then pour into water.
Results for emulsion test - correct answer Positive = lipids will precipitate out
of the solution and show as a milky emulsion. Negative = nothing
Test for protein - correct answer Biuret test
How to do buiret test - correct answer Ass a few drops of potassium hydroxide
solution to make the solution alkaline. Add some copper sulphate solution.
