a) Design an experiment to investigate the effect of temperature on the rate of diffusion of potassium manganate(VII) in water. Aim: To investigate how temperature affects the rate of diffusion of potassium manganate(VII) in water. Hypothesis: The rate of diffusion of potassium manganate(VII) in water increases as the temperature of the water increases. Variables: Independent Variable: Temperature of water. Dependent Variable: Rate of diffusion (measured by time taken for the purple colour to spread a certain distance or fill a certain volume). Controlled Variables: Volume of water, concentration of potassium manganate(VII) solution, volume of potassium manganate(VII) solution added, size and shape of the container, light conditions. Apparatus and Materials: Three 250 cm³ beakers Three 100 cm³ measuring cylinders Three thermometers (0-100 °C) Stopwatch Heating plate/Bunsen burner with tripod stand and gauze Ice bath Dropper/pipette Ruler Distilled water (600 cm³ provided) Potassium manganate(VII) solution (BA1, 10 cm³ provided) Procedure: 1. Label three 250 cm³ beakers as A, B, and C. 2. Pour 100 cm³ of distilled water into each beaker using a measuring cylinder. 3. Place beaker A in an ice bath to cool the water to a low temperature (e.g., 5-10 °C). 4. Place beaker B at room temperature (e.g., 20-25 °C). 5. Heat beaker C gently on a heating plate or with a Bunsen burner until the water reaches a higher temperature (e.g., 50-60 °C). 6. Measure and record the exact temperature of the water in each beaker using a thermometer. 7. Carefully add one drop of potassium manganate(VII) solution to the centre of the water surface in beaker A using a dropper, without stirring. 8. Immediately start the stopwatch. 9. Observe the spread of the purple colour. Record the time taken for the purple colour to diffuse a predetermined distance (e.g., 2 cm downwards or outwards) or to visibly spread throughout a significant portion of the water. 10. Repeat steps 7-9 for beaker B and then for beaker C, ensuring the water temperatures are maintained as constant as possible during the observation period. 11. Record all observations and times in a table. 12. Repeat the entire experiment at least three times for each temperature to ensure reliability and calculate average times. Risks and their Mitigations: Risk: Hot water can cause burns. Mitigation: Handle hot beakers with heat-resistant gloves or tongs. Allow hot water to cool before disposal. Risk: Potassium manganate(VII) is an oxidizing agent and can stain skin and clothing. Mitigation: Wear safety goggles and a lab coat. Avoid direct contact with the solution. Wash hands thoroughly after handling. Risk: Broken glassware can cause cuts. Mitigation: Handle glassware carefully. Report any breakages immediately and dispose of broken glass in a designated container. Risk: Heating apparatus (Bunsen burner, hot plate) can cause burns or fires. Mitigation: Ensure proper ventilation. Keep flammable materials away from heat sources. Turn off heating apparatus when not in use. Send me the next one 📸