BI-1311
Food tests
Biology · Secondary 4 · Easy · Food tests
A student wants to test a food sample for starch. Which reagent should she use and what is a positive result?
- Add iodine solution; a blue-black colour appears.
- Add Benedict’s solution and heat; a brick-red precipitate forms.
- Add ethanol then water; a cloudy white emulsion forms.
- Add biuret solution; the mixture turns violet.
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