Chemistry · May / June 2020 · Paper 21 · Question 5
5070
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Hydrochloric acid, HCl, reacts with barium hydroxide, Ba(OH)2, as shown. 2HCl (aq) + Ba(OH)2(aq) BaCl 2(aq) + 2H2O(l) A sample of 25.0 cm3 of 0.0500 mol / dm3 Ba(OH)2 is placed in a beaker. Dilute HCl is added slowly, from a burette, to the Ba(OH)2(aq) in the beaker. A pH probe is used to measure the pH of the solution in the beaker until a total of 40.0 cm3 of dilute HCl is added. The table shows how the pH of the solution in the beaker changes. volume of dilute HCl added / cm3 pH of the solution in the beaker 0.0 13.0 5.0 12.9 10.0 12.5 15.0 11.6 20.0 7.0 25.0 3.0 30.0 1.6 35.0 1.1 40.0 0.9
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5(a)[2]
5(b)[1]
5(c)[3]
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