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SCIPAD - BIG IDEAS - BOOK 2
BASIS OF CHEMICAL REACTIONS
Changes in pH of a Solution as Acid is Added
10
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0
2
4
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20 30 40 50 60 70 80
Volume of Acid added (mL)
pH of solution
8. The graph above shows the pH of a basic solution as increasing amounts of acid are
added to it.
(a) Is the solution at the start of the investigation acid or alkali? 
(b) What evidence did you use to answer question (a)? 

(c) How much acid was added before the solution became neutral? 
(d) What was the pH of the acid that was added to the solution? 
(e) What evidence did you use to answer question (d)? 


9. Write word equations for the following reactions:
(a) Copper reacting with sulfuric acid to produce copper sulfate and hydrogen gas.
		
(b) Zinc oxide forming when zinc is heated in oxygen.
		
(c) Calcium sulfate and water are produced when sulfuric acid is neutralised by
calcium hydroxide.
		
10. (a) Outline why your stomach contains acids. 

(b) What happens if this acid rises into the oesophagus? 

(c) How can the problem you outlined in 10(b) be fixed. 


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