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Testing a drink for sugar
A drinks company claims that a drink contains sugar, protein and fat.
Describe how a student could test the drink for sugar. Give the colour of a positive result.
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Marking points
- 1 Adds Benedict's reagent / solution to the drink.
- 2 Heats the mixture appropriately (at least 60 °C if a temperature is specified).
- 3 Gives an accepted positive colour: green, yellow, orange, brown, or brick red.
Full-mark answer
Add Benedict's solution to the drink and heat the mixture in a hot water bath. A positive result changes to green, yellow, orange, brown or brick red.
Why this answer loses marks
Add Benedict's solution and warm the drink; it turns red.
“Warm” is too vague for the required treatment; state that the mixture is heated appropriately.