Plant extracts contain molecules which have many uses in industry and as medicines. It is important for scientists to be able to estimate the concentration of these molecules in plant extracts. You will estimate the concentration of molecule R in a sample of plant extract U. You are provided with the materials shown in Table 1.1. Table 1.1 labelled | contents | hazard | volume/cm³ --- | --- | --- | --- 10R | 10% solution of molecule R | none | 100 W | distilled water | none | 100 U | unknown concentration of molecule R in a plant extract | none | 40 A | sulfuric acid solution | harmful irritant | 20 K | potassium manganate(VII) solution | irritant | 20 If any of the solutions come into contact with your skin, wash off immediately under cold water. It is recommended that you wear suitable eye protection and wear gloves to protect your hands when using A and K.