Neutralisation

9.Which of the following is NOT a base?

10.In the reaction between hydrochloric acid and iron oxide, what is the salt formed?

11.What is a soluble base called?

12.Which of the following reactions produces carbon dioxide gas?

13.A student adds a metal carbonate to an acid and observes fizzing. Which gas is being produced?

14.In a neutralisation reaction between sulfuric acid and potassium hydroxide, what is the salt formed?

15.A student neutralises 25 cm³ of 0.1 mol/dm³ hydrochloric acid with sodium hydroxide. The temperature rises by 3°C. In a second experiment, 50 cm³ of the same acid is neutralised with the same concentration of sodium hydroxide. What temperature rise would you expect?

16.Which of the following is the correct word equation for the reaction between nitric acid and calcium carbonate?

17.A student tests the pH of a solution before and after adding an acid to a base. The pH changes from 9 to 7. What does this indicate?

18.In an experiment, 10 cm³ of 0.5 mol/dm³ hydrochloric acid is neutralised by 20 cm³ of sodium hydroxide solution. What is the concentration of the sodium hydroxide?

19.A student adds universal indicator to a solution and observes a gradual colour change from red to purple as more acid is added. Why is universal indicator not suitable for determining the endpoint of a neutralisation?

20.What is the pH of a solution formed when an acid is exactly neutralised by a base?

21.A student mixes hydrochloric acid with magnesium oxide. Which of the following is a product of this reaction?

22.The graph shows pH against volume of acid added to a base. Which point indicates the endpoint of neutralisation?

23.Which of the following is a soluble base?

24.In a titration, 15 cm³ of nitric acid neutralises 25 cm³ of 0.2 mol/dm³ potassium hydroxide. What is the concentration of the nitric acid? (Assume 1:1 mole ratio)

25.A student adds universal indicator to a beaker containing an acid and slowly adds a base. The colour changes gradually from red to purple. Why is universal indicator not suitable for determining the exact endpoint of this neutralisation?

26.Which of the following is the correct general word equation for the reaction between an acid and a metal carbonate?

27.A student adds excess calcium carbonate to dilute hydrochloric acid. After the reaction, which substances are present in the mixture?

28.In an experiment, 25 cm³ of 0.1 mol/dm³ hydrochloric acid is neutralised by 20 cm³ of sodium hydroxide solution. What is the concentration of the sodium hydroxide? (Assume a 1:1 mole ratio)

29.Which indicator would be most suitable to determine the exact endpoint of a neutralisation reaction between a strong acid and a strong base?

30.A student uses a thermometer to measure the temperature change during a neutralisation reaction. Which observation confirms that a chemical reaction has taken place?

31.What is the name of the salt formed when nitric acid reacts with calcium oxide?

32.Which of the following reactions would produce a salt and water only?

33.A student performs a titration using phenolphthalein. Initially, the solution in the flask is pink. As acid is added, the solution becomes colourless at the endpoint. Which substance was originally in the flask?

34.A student adds a few drops of methyl orange to an acid. The solution turns red. They then add a base until the solution turns yellow. What does the colour change indicate?

35.A student adds 25 cm³ of 0.1 mol/dm³ hydrochloric acid to a beaker containing excess zinc oxide. After the reaction, which substance is NOT present in the mixture?

36.In a titration, 20 cm³ of 0.5 mol/dm³ sulfuric acid is neutralised by 40 cm³ of sodium hydroxide solution. What is the concentration of the sodium hydroxide? (Assume 1:2 mole ratio: H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O)

37.Which of the following is the correct word equation for the reaction between sulfuric acid and calcium carbonate?

38.A student measures the pH of a solution before and after adding an acid to a base. The pH changes from 11 to 7. What volume of 0.2 mol/dm³ acid was added if the base was 50 cm³ of 0.1 mol/dm³ sodium hydroxide? (Assume 1:1 mole ratio)

39.A student adds universal indicator to a solution and observes a gradual colour change from red to purple as more acid is added. Why is universal indicator not suitable for determining the exact endpoint of a neutralisation reaction?

40.The graph shows pH against volume of acid added to a base. Which point on the pH curve indicates the endpoint of neutralisation?