Homework Answers
Sulfuric acid is a strong acid and dissociates completely into protons; consequently, sulfuric acid will have the lowest pH (the stronger the acid, the lower the pH and viceversa).
Benzoic acid is an organic acid. Organic acids are generally weak acids; infact benzoic acid is a weak acid and dissociates only partially into protons.
Potassium chloride, KCl is the salt of the strong acid HCl and strong base KOH and hence is neutral.
Methyl amine is an organic base. Organic bases, likes organic acids are weak bases and ionize partially to give OH- ions.
Calcium oxide, CaO is a strong base because it reacts with water to produce OH-. Infact, CaO completely ionizes to give OH- by reaction with water.
Therefore, we can complete the table as below.
|
Rank (in order of increasing pH) |
Label |
|
|
Calcium Oxide |
5 |
Strong base |
|
Benzoic acid |
2 |
Weak acid |
|
Potassium Chloride |
3 |
Neutral |
|
Sulfuric Acid |
1 |
Strong acid |
|
Methylamine |
4 |
Weak base |
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