Titration Worksheet - Answer Key
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- What is a titration?
There are two types of titration – acid-base and redox titration. We will be focusing on the acid-base titration.
In the lab, a titration is when a solution of unknown concentration is reacted with a solution of known concentration. This reaction will tell you more information about the unknown solution.
In the context of a homework or exam question, it means that you are reacting two substances.
- What is the equivalence point?
The point in a titration where the reactants are perfectly reacted.
In the case of an acid/base titration the equivalence point is when
- For a strong acid and weak base reaction the equivalence point has a
pH < 7.
- Why?
Because the conjugate of the weak base is a weak acid that reacts in solution.
- For a strong base and weak acid reaction the equivalence point has a
pH > 7.
- Why?
Because the conjugate of the weak acid is a weak base that reacts in solution. - Determine the pH of the following solutions
- 1.00 L solution of 1.00M HNO2 and 1.50M NaNO2.
(Ka = 4 x 10-4).
pH = 3.57
- The solution in part a after 0.200 moles HCl has been added.
pH = 3.43
- Determine the pH of the following solutions
- 25.0g of NH3 and 40.0g NH4NO3 in 501.0 mL of water.
(Ka = 5.6 x 10-10)
pH = 9.72
- The solution in part a after 0.02 mol of NaOH has been added.
pH = 9.74
- Calculate the pH when 80. mL of 0.25M KOH is added to 40. mL of 0.50M HClO. (Ka = 3 x 10-8)
pH = 10.37
- Calculate the pH for 100.0 mL of 0.400M CH3COOH with 300. mL of 0.200M NaOH.
pH = 12.699