5 Do not write outside the 0 2 A student investigated the effect of temperature on the decay of milk. box Figure 3 shows the apparatus the student used. Figure 3 exab Whenit Thermometer PH meter OFF PH sensor Fresh milk helder Computer WEB This is the method used. 1. Set up the apparatus as shown in Figure 3 with the milk at 20 .C. 2. Record the pH over 5 days using the computer. 3. Repeat with another batch of fresh milk at 25 .C. 0 2. 1 How could the student keep the milk at a constant temperature for 5 days? [1 mark]