Question 22
In this investigation, 2 g each of calcium chloride (A), sodium carbonate (B), magnesium chloride (C) and potassium chloride (D) are placed in separate polystyrene cups. Add 10 cm³ water to each salt, stir gently and record initial and final temperatures. Keep a fifth cup with water only. Rinse the thermometer before each test. Is your conclusion limited? Give a reason for your answer.
