The data for the titration of 25.00 mL of Unknown Acid Sample #80 with 0.1508 M…

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The data for the titration of 25.00 mL of Unknown Acid Sample #80 with 0.1508 M…

The data for the titration of 25.00 mL of Unknown Acid Sample #80 with 0.1508 M NaOH (aq) was plotted on the graph below.

To help with your analysis we have summarized some of the key numerical values that were determined from the original data – using the methods on Page 13 of your lab manual to graphically determine the equivalence point.

Unknown #27
Volume of NaOH added at the potentiometric endpoint (mL)21.25 mL
Volume of NaOH added at the half-equivalence point (mL)10.63 mL
pH at the half-equivalence point4.90
pH at the start of the titration3.23

Report your calculated original (stock) acid concentration (in mol/L) below, using the appropriate number of significant figures. Do not use scientific notation!

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Reference no: EM132069492

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