CSEC Chemistry · May/June 2013 · Paper 2 · Question 1(a)(i)

Peter designed an experiment to investigate the solubility of potassium iodide (KI) at varying temperatures. The procedure involved measuring 100 cm³ of distilled water, weighing the beaker with water, adding solid potassium iodide until no more dissolved while maintaining temperature, and then weighing the beaker with the salt solution. This was repeated at 20 °C, 40 °C, 60 °C, and 80 °C. Table 1 provides the mass of the beaker with water and the mass of the beaker with salt solution at these temperatures.

For EACH temperature in Table 1, calculate the mass of potassium iodide that was dissolved in the beaker of water, and record the value in the space provided.

This question uses a figure or table from the paper — you'll see it when you practise.