Ijmb Model Questions Vol1 2017 Biology Question 3

A student is investigating the carbohydrate content of a powdered food sample using Benedict's test. The procedure is as follows: 1. Prepare a standard glucose solution by dissolving 0.50 g of pure glucose in 100.0 mL of distilled water. 2. Take 5.0 mL of the standard solution, add 5.0 mL of Benedict's reagent, heat in a boiling water bath for 5 minutes and allow the precipitate to cool. After drying, the precipitate weighs 0.025 g. 3. Weigh 2.00 g of the powdered food sample, grind it finely and extract with 50.0 mL of distilled water. Filter the mixture and take 5.0 mL of the filtrate, treat it exactly as in step 2. The dried precipitate from this unknown sample weighs 0.018 g. Using the data above, answer the following questions: