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# Lewis Acids and Bases, pH, and Weak Acids

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Question 1: Using the Lewis concept of acids and bases, identify the Lewis acid and base in each of the following reactions:

1. Al(NO3)3
a) Lewis Acid
b) Lewis Base
c) Neither

2. H2O
a) Lewis Acid
b) Lewis Base
c) Neither

3. CH3NH2
a) Lewis Acid
b) Lewis Base
c) Neither

4. HBr
a) Lewis Acid
b) Lewis Base
c) Neither

pH of a Strong Acid and a Strong Base
Question 2: 0.35 of hydrogen chloride ( ) is dissolved in water to make 6.5 of solution. What is the of the resulting hydrochloric acid solution?
Express the pH numerically.

pH =

Question 3:

Part B
0.55 of sodium hydroxide ( ) pellets are dissolved in water to make 7.0 of solution. What is the of this solution?
Enter the pH numerically using four significant figures.
=

Question 4: Many household cleaning products contain oxalic acid, , a diprotic acid with the following dissociation constants: , .

Calculate the equilibrium concentration of in a 0.20 solution of oxalic acid.

Express the molar concentration numerically using two significant figures.

C2O42- = M

https://brainmass.com/chemistry/acids-and-bases/lewis-acids-bases-ph-weak-acids-242620

#### Solution Summary

This solution explains:

1) How to characterize Lewis acids and bases.

2) How to find the pH of a strong acid in solution.

3) How to find the pH of a strong base in solution.

4) How to find the concentration of H+ based on the concentration of a weak acid in solution.

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