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Question: a conical flask containing 20 ml of liquid labelled quothydrochloric...

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A conical flask containing 20 ml of liquid labelled "hydrochloric acid (HCl), 1 M" was titrated with potassium hydroxide (KOH) known to have an exact concentration of 1 M. The experiment was repeated twice and the following readings were obtained:

Flask number Volume of KOH (ml)
1 21.0
2 22.0
3 21.5

a. Calculate the mean value for the volume of KOH from the readings obtained. (1 mark)

b. Write a balanced chemical equation (physical states not needed) for the reaction of the experiment and calculate the expected (theoretical) volume of KOH based on the information given prior to the experiment. (2 marks)

c. What is the difference between your experimental result in (a) and the theoretical result in (b)? Comment on the difference by outlining one strong possible reason that may have contributed to it. (2 marks)

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