Page 3 - X-CHEM-CBQ-CH-2

(i) If the second solution being measured is acidic in nature

(ii) If the second solution being measured is basic in nature

5. A remarkable property of acids is that they can 'dissolve' metals. When metals
are added to an acid, they disintegrate and disappear into the acid.
(a) State one other common observation when metals 'dissolve' in acids.
Explain the reason for this observation.
(b) If the acid with the 'dissolved' metal is evaporated, can we get the metal

back? Why or why not?
(c) In this question, the word 'dissolve' is used within quotes. This is because it is
not actually an example of dissolving. What is the main difference between a
metal 'dissolving' in an acid and sugar dissolving in water?
6. While demonstrating acid base reactions, Mr. Johnson , a science teacher added
sodium oxide to HCI until it was in excess. Which of the following graphs

correctly represents the change in pH?

7. Study the given flow chart carefully and fill in the blanks by choosing an
appropriate option.