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Exp5-titration-F07

# Exp5-titration-F07 - In comparison to the HCl the initial...

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59 Experiment 5- Potentiometric Titrations Name___________________________ Report Sheet Partners________________________ ________________________________ Table 1. Titration data for various acids. initial pH pH at ½ equivalence Volume at equivalence final pH 0.010 M HCl 0.020 M HCl 0.030 M HCl 0.010 M CH 3 COOH 0.020 M CH 3 COOH 0.030 M CH 3 COOH 0.010 M HCOOH 0.020 M HCOOH 0.030 M HCOOH 0.005 M HOOCC 2 H 2 COOH 0.010 M HOOCC 2 H 2 COOH 0.020 M HOOCC 2 H 2 COOH Results and Discussion: 1) Which of the acids studied are weak? Which are strong? How can you tell from the data? 2) Calculate the pKa for the three weak acids from the Ka values given in the lab manual. How do the experimentally determined pKa’s compare with the calculated values?

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60 3) Examine the acetic acid and HCl data.
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Unformatted text preview: In comparison to the HCl, the initial pH of the acetic acid solution does not change as dramatically with the addition of base. Why is this the case? 4) Choose three monoprotic acids of the same concentration, what is the volume at equivalence for each? Comment on the similarities. 5) Draw the Lewis structures for formic acid and acetic acid. Circle the hydrogen that will leave as H + when the acid dissociates in water. 6) The weak base, B, is titrated with the strong acid, H 3 O + , to give the conjugate acid and water. Write the reaction for the titration reaction. 7) What is the pH at the equivalence point of a titration of a weak base with a strong acid? (circle one) pH<7 pH=7 pH>7 8) Why?...
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