# Al Noor Public School Chemistry Worksheet

Your task is to complete the questions in the problem set. Please note that you must include units throughout all of your calculations, and provide your answer in scientific notation to the correct number of significant digits. Your submission should include the following:

• The formulas used to solve the problems
• All mathematical calculations

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Assignment: Acids and Bases

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Assignment: Acids and Bases
Throughout this unit, you have learned about the properties of acids and bases,
including how they dissociate/ionize in water to produce hydronium and
hydroxide ions. You’ve learned about the pH scale, conjugate acid and base
pairs, making buffers, and how to use titrations to find unknown concentrations of
acids and bases.
In this assignment, demonstrate your understanding of acids and bases by
completing a problem set.
Instructions
in scientific notation to the correct number of significant digits.
Questions
1. Identify the acid, its conjugate base, the base, and its conjugate acid in the
following reaction: (2 marks)
CH3 COOH(aq)
+ H2 O(l)

CH3 COO

(aq)
+ H3 O
+
(aq)
2. Because rain washes pollutants out of the air, many Ontario lakes are
undergoing changes in pH. The water in one such lake was found to have a
hydronium ion concentration of 5.6 x 10-4 M. What is the pH of this lake? Is it
considered acidic or basic? (2 marks)
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Assignment: Acids and Bases
3. The pH of a sample of human blood was measured to be 7.36 at 25°C. What

is the hydroxide ion [OH(aq) ] concentration? (3 marks)
4. What is the pH of a sodium hydroxide solution at 25°C in which the hydroxide
ion concentration is 0.0063 mol/L? Is the solution acidic or basic? (3 marks)
5. A 0.35 M solution of hydrofluoric acid (HF(aq) ) has a pH of 3.82 at 25°C.
Calculate the Ka and Percent Ionization of hydrofluoric acid. (4 marks)
HF(aq)

+ H2 O(l) ⇌ F
(aq)
+ H3 O
+
(aq)
6. A 30.00 mL sample of 0.423 M nitric acid (HNO3 (aq) ) is titrated with 15.00
mL of 0.632 M lithium hydroxide (LiOH(aq) ). Determine the amount of
[H3 O
+
(aq)
]
remaining in the flask and pH of the solution after reaction. (4
marks)
Assessment Details
Your submission should include the following:

The formulas used to solve the problems

All mathematical calculations

Select the links to review content on significant digits and scientific notation.

Significant Digits
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Assignment: Acids and Bases
Scientific Notation
Submit this assignment to the dropbox. This assignment will be evaluated for a grade that will
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