Chemical Analysis
Posted: Wed Dec 15, 2021 10:51 am
Chemical Analysis
1. Describe why are standard solutions important in chemical analysis. 2. A student carried out the standardisation of a solution of hydrochloric acid (HCI) by titration with a standard solution of 0.05 moll" sodium hydroxide (NaOH). They recorded the following observations and results. Concentration of sodium hydroxide = 0.05 moll-1 Average volume of sodium hydroxide used in titre = 21.2 cm? Volume of hydrochloric acid used in titre = 25 cm Sodium hydroxide neutralises hydrochloric acid according to the following equation: NaOH + HCI | -- NaCl + H20 Use the information provided to calculate the concentration of hydrochloric acid in moll" 3. The raw data for the titration experiment is shown below: Titre Vol NaOH start (cm) Vol NaOH end (cm”) 1 0.0 23.0 2 23.0 443 3 0.0 21.1 Explain why the average volume of sodium hydroxide used in a titre is 21.2 cm'. .
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