P.197#1-5 and P.201#1,2

March.4
Page 197 Questions Number 1-5

1.Is a solution with a pH of 11 acidic or basic?
Ans: A solution with a pH of 11 is basic, since anything with a pH larger than 7 is basic.

2.Is a solution with a pH of 5 acidic or basic?
Ans: A solution with a pH of 5 is acidic, since anything with a pH less than 7 is acidic.

3.What is the pH of pure water?
Ans: The pH of pure water is 7 which is neutral.

4.Could you determine a specific pH value for a solution using blue litmus paper? Explain.
Ans: It's impossible to determine a specific pH values for a solution using blue litmus paper, because it shows up only the reacted color.

5.What is the advantage of using a universal indicator?
Ans: An universal indicator is a mixture of chemicals that changes color through a wide range of pH values. It's a more precise way to measure pH.

Page 201 Questions Number 1,2

1.Name the following bases.
a)KOH(s)
Ans: Potassium Hydroxide.

b)Ca(OH)2 (s)
Ans: Calcium Hydroxide.

c)Mg(OH)2 (s)
Ans: Magnesium Hydroxide

d)NH4OH (aq)
Ans: Ammonium Hydroxide

2.Which polyatomic ion group is found at the end of the chemical formula for most bases?
Ans : The polyatomic ion hydroxide (OH) is commonly found at the end of the chemical formula of bases.