Chem 1CL Spring ‘12 TA: Niva Ran

Experiment 16: Synthesis of Alum

Author: _____________________________ Lab Partner:____________________________

Pre-Lab: (3 pts) _________ Name, Date, Title, Introduction, Pre-Lab Questions

TA signature (initials) required

Data: (3 pts) _________ Original data from your lab notebook must be stapled onto your lab report

Mass of Aluminum Foil

Mass of Alum product

Observations for BaCl2 test, KOH test, Flame test, and Water test

Include balanced equations for net ionic reactions

Calculations: (2 pts) _________

Alum theoretical yield

Alum percent yield

Discussion: (9 pts) Most Important Section - Must be Typed _________

1 – 1 ½ pages in length (Be articulate and succinct) - 12 pt font, standard margins

Use only your own words: Start with a brief introduction to the material studied and why this

experiment is of interest; explain how the objectives of the experiment were accomplished

Discuss specific results (your results)

Include balanced equations for reactions to synthesize alum (each equation must be on a

separate line but in context with your discussion).

Discuss your results for the theoretical and percent yield of alum

(explain why percent yield is greater or less than 100%)

Discuss results for the KOH and BaCl2 test, include net ionic reactions (on separate lines)

Discuss results for the flame and the water test

Discuss possible sources of error and how the error affects your results as you analyze your

results

Review Questions: (3 pts) _________ Clearly show your calculations and put a box around each answer.

Neatness: Every page present, Name/Date/Exp.# each page, Writing is legible

No scribbles, no whiteout - draw a single line through mistakes

Sections Organized/Labeled, Final answer for each question is boxed

Report stabled with rubric as cover page before you come into lab

NOTE: After you complete the lab this week, write the Lab Report and turn it in. Your alum crystals

will continue to grow over the next two weeks. You will discuss the results of your crystals in a

separate paragraph when you turn in your lab report for Exp. 17.

Staple this page to your lab report.

TOTAL: (20 max) _________