ACSBR Acids and Bases - Assignment

Anglo-Chinese School (Barker Road) A Methodist Institution Founded in 1886 CHEMISTRY DEPARTMENT OF SCIENCE Name: ( ) Class: SEC 3 ACIDS & BASES – ASSIGNMENT ALEX LEE/2010 PAGE 1 OF 5 PURE/COMBINED Multiple-Choice Questions [20 Marks] TOTAL SCORE / 30 Write in your selected answer for the multiple-choice questions in the boxes provided. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1. A 50 cm3 sample of acid was placed in a beaker, and universal indicator was added. Aqueous alkali was then added gradually, and the pH of the solution measured at regular intervals. Below shows the graph of the resulting pH against volume of sodium hydroxide added. 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 6010203040500 volume of NaOH(cm3) pH 700.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 6010203040500 volume of NaOH(cm3) pH 70 What is the volume of aqueous sodium hydroxide required to neutralise the acid sample? A 10 cm3 B 28 cm3 C 50 cm3 D 60 cm3 2. Which one of the following statements is the most accurate definition of an acid? A An acid is a substance that liberates carbon dioxide when added to a carbonate. B An acid is a substance that produces hydrogen ions in aqueous solution. C An acid is a substances that turns blue litmus solution red D An acid is a substance that reacts with a base.

ALEX LEE/2010 PAGE 2 OF 5 3. The pH of several household substances is shown below: Substance green tea kitchen cleaner polish remover vinegar pH 7.9 9.9 6.5 5.1 Which of the above substances would most likely produce a blue and yellow colour respectively when tested with universal indicator? blue yellow A green tea polish remover B kitchen cleaner green tea C polish remover vinegar D vinegar kitchen cleaner 4. Which of the following is not a property of an acid? A Acids are soluble in water. C Acids have a sour taste. B Acids dissociate hydrogen molecules. D Acids turn litmus solution red. 5. Which one of the following must be true of an acidic gas? A It is the only salt formed from a dibasic acid. B It has dissociated hydrogen ions. C It turns damp universal indicator paper orange. D It turns dry blue litmus paper red. 6. Which of the following is not a similarity between ethanoic acid and hydrochloric acid? Both acids are A monobasic acids. C weak acids. B of a pH less than 7. D able to react with insoluble bases. 7. Citric acid, found in oranges, is a weak acid because it A is used in food products. C is not completely ionised in solution. B is not very soluble in water. D freezes on a cold day. 8. The pH of four aqueous solutions P, Q, R and S, is as shown in the diagram below. Which of the following sets of substances correctly corresponds with the pH of solutions P, Q, R & S (in this order)? A sulfuric acid; ethanoic acid; sodium chloride; aqueous ammonia B aqueous ammonia, sodium chloride; ethanoi