At this station the two burets represent the initial and end point buret reading

Question

At this station the two burets represent the initial and end point buret readings for the NaoH (aq) used in the determination of the equivalent weight of an unknown acid. A sample of the unknown acid weighing 0.374 g was titrated to the endpoint with 0.1052 M NaoH. Take readings from the two burets, record these readings below, and determine the net volume of 0.1052 M NaOH used in the titration of the acetic acid in the vinegar. Next, determine the equivalent weight of the unknown acid. Final Buret Reading of NaOH (aq) = ____ Initial Buret Reading of NaOH (aq) = ______ Net volume of NaOH (aq) used = ___ Proper calculation setup must be shown for the determination of the equivalent weight of the unknown acid:

Explanation / Answer

Final buret reading of NaOH = 49.39 ml
Initial Buret reading of NaOH = 0.71 mL
Net volume of NaOH used = 48.68 mL
moles of NaOH used = molarity x volume in L = 0.1052 moles/L x 0.04868 L = 0.00512 moles

moles of Unknow sample = 0.00512 moles

moles = g/mol.wt
0.00512 moles = 0.374g/ mol.wt

mol.wt = 0.374 g/ 0.00512 moles = 73.05 g/mol

Assume the unknow sample is monobasic acid, then the equivalent weight = 73.05 g/mol

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