Illustrated Guide to Home Chemistry Experiments

208 DIY Science: Illustrated Guide to Home Chemistry Experiments

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q 1 : Best practice when titrating an unknown is to do multiple titrations. Why?

TABLE 11-4: Standardize a solution by titration—observed and calculated data

Item Data

A. Mass of sodium carbonate _______.____ g

B. Titrant stock solution molarity ____.______ mol/L

C. Volume of titrant stock solution _____.____ mL

D. Titrant working solution molarity ____.______ mol/L

E. Volume of ~1.0 M HCl bench solution _____.____ mL

F. Estimated volume of titrant required _____.____ mL

G. Initial burette reading _____.____ mL

H. Final burette reading _____.____ mL

I. Actual volume of titrant used (H – G) _____.____ mL

J. Moles of sodium carbonate required ___._______ moles

K. Moles of HCl present in aliquot ___._______ moles

L. Molarity of HCl bench solution ____.______ mol/L