Chem 12 pH Candy lab

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  • Purpose
    • To find the pH and Concentration of an everyday acid.
  • Procedure
    • If a solid, crush the candy and dissolve it in 50.0ml of water
      • If need be filter it afterwards
    • Titrate 10ml samples of acid with 0.10M NaOH three times
    • Use titration data to find [acid] and pH
  • Materials
    • Citric acid (Chemical compound goes here)
    • NaOH
    • Beaker
    • Graduated cylinder
    • Phenolphthalein
  • Data
    • 61g of citric acid (H3C6H5O7)
    • 10M NaOH
Trial # Trial 1 Trial 2 Trial 3
Volume initial 50ml 50ml 50ml
Volume final 47.3ml 46.4ml 46.7ml
Neutralization vol 2.7ml 3.6ml 3.3ml
  • Neutralization vol average = 3.2ml

 

  • Calculations
  • 61g * 1 mol/192g = 2.40*10-2 mol
  • 40*10-2 mol * 1/3.2*10-3 L = [7.50M] Citric acid
  • pH= -log[7.50M] pH= 0.88
  • Conclusion
    • Citric acid is pinkish in color
    • The pH of H3C6H5O7 is 0.88 and its concentration in a 10ml solution is 7.50M

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