Investigating the Concentration of Citric Acid
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Throughout this experiment, I will ensure that I wear safety goggles and a protective lab coat so that I my eyes and clothes are protected from the acids and alkalis and no damage is likely to be caused to either. Results
Titration Results
Trail Titration (cm3)
Titration 1(cm3)
Titration 2 (cm3)
Titration 3 (cm3)
Titration 4(cm3)
Initial Volume in Burette
0.7
0
0
0
0
Final Volume in Burette
46.8
45.4
45.2
45.3
45.3
Volume citric acid used
46.1
45.4
45.2
45.3
45.3
Average volume used
45.3 Calculation to work out the percentage purity of the citric acid
Volume sodium hydroxide used: Volume citric acid
25cm3 : 45.3 cm3
Number of grams in 25 cm3 of sodium hydroxide = 1.0M contains 1 mole of sodium hydroxide per 1 dm3 . Therefore in 25 cm3 (1 dm3 / 40 = 25 cm3) amount of moles of sodium hydroxide in 25 cm3 = 1.0/40 = 0.025 moles.
Number of moles = Mass/RMM
O.25 = Mass/40 (RMM NaOH = 23+16+1 = 40)
0.25*4 ...
