Energy drinks contain a high concentration of carbohydrates, such as glucose, as a source of energy. Glucose is a monosaccharide which can be quickly metabolised by body cells, releasing energy during exercise. Glucose changes the colour of potassium manganate(VII) solution, P, from purple to colourless. The end-point is when P is completely colourless. You will need to: • prepare different concentrations of glucose solution • record the time taken to reach the end-point for the known glucose concentrations • use your results to estimate the concentration of glucose in an energy drink, U. You are provided with the materials shown in Table 1.1. Table 1.1 labelled | contents | risk | volume/cm³ G | 20% glucose solution | none | 50 W | distilled water | none | 20 A | dilute sulfuric acid | irritant | 20 P | potassium manganate(VII) solution | low risk irritant | 20 U | energy drink | none | 10 It is recommended that you wear suitable eye protection. If A or P come into contact with your skin, wash off immediately under cold water.