CSEC Chemistry · January 2011 · Paper 2 · Question 1(a)(v)

An experiment is conducted to determine the end point of an acid-base reaction by measuring temperature changes when different volumes of a strong acid react with a strong base. Table 1 shows volumes of sulfuric acid reacting with 25 cm³ of 2.0 mol dm⁻³ sodium hydroxide and the resulting temperature changes. Figure 1 shows thermometer readings for the addition of 10 cm³ and 20 cm³ of H₂SO₄.

Draw the TWO lines of best fit through the points in (iv) above where the temperature is increasing and where the temperature is decreasing and hence determine the end point of the reaction. Volume of H₂SO₄ at end point

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