AQA GCSE COMBINED SCIENCE: TRILOGY H Higher Tier Chemistry Paper 1H

This question is about carbon dioxide. Carbon dioxide is soluble in water and forms an acidic solution. Name an indicator that could be used to test if the solution is acidic. Give the result of the test. How does the solubility of carbon dioxide change as the temperature of the water increases? Carbon dioxide dissolves in water to form an acidic solution. How does the pH of the solution change as the temperature of the water increases? Calcium carbonate reacts with hydrochloric acid to produce carbon dioxide. The equation for the reaction is: CaCO3(s) + 2 HCl(aq) → CaCl2(aq) + CO2(g) + H2O(x) What is the state symbol (x) in the equation? Figure 2 shows equipment a student used for an investigation. The student investigated the volume of carbon dioxide produced when different masses of calcium carbonate react with hydrochloric acid. Describe a method the student could use. Lithium hydroxide reacts with sulfuric acid to produce lithium sulfate. The equation for the reaction is: 2 LiOH + H2SO4 → Li2SO4 + 2H2O 0 2 . 1 What type of reaction is this? Calculate the relative formula mass (Mr) of sulfuric acid (H2SO4). Relative atomic masses (Ar): H = 1 O = 16 S = 32 Calculate the percentage by mass of oxygen in lithium sulfate (Li2SO4). Relative atomic mass (Ar): O = 16 Relative formula mass (Mr): Li2SO4 = 110 Give your answer to 2 significant figures. A solution of lithium sulfate contains 0.30 g of lithium sulfate in 25 cm3 . Calculate the concentration of lithium sulfate in g/dm3