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To perform and master a recrystallization of an ionic compound

To write a procedure for a simple experiment

To calculate for percent error in an experiment

To understand how results affect percent error
To identify sources of error in experiments

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Recrystallization is one way of isolating an ionic compound from a solution. If several ionic compounds are present in an aqueous solution, then a precipitation reaction may be performed to remove the unwanted ions. In this experiment, a known amount of NaCl will be dissolved in some water, and then recrystallized by boiling off the water.

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Trial #1

A

. Mass of salt (NaCl) used.

1.30g

B

. Mass of empty beaker before you start

142.61g

C

. Mass of beaker with recrystallized NaCl

143.91g

D

. Mass of recrystallized NaCl (C minus B)

1.30g

E

. Volume of water added to dissolve NaCl

25.00mL

Trial #2

A.

Mass of salt (NaCl) used

1.84g

B.

Mass of empty beaker before you start

142.61g

C.

Mass of beaker with recrystallized NaCl

144.65g

D.

Mass of recrystallized NaCl (C minus B)

1.99g

E.

Volume of water added to dissolve NaCl

25.00mL

Trial #3

A

. Mass of salt (NaCl) used

1.29g

B.

Mass of empty beaker before you start

142.59g

C.

Mass of beaker with recrystallized NaCl

143.78g

D.

Mass of recrystallized NaCl (C minus B)

1.21g

E.

Volume of water added to dissolve NaCl

25.00mL

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Which ESLR or ESLR's were adressed in the activity? State the ESLR and explain why in a short paragraph.

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Which ESLR or ESLR's were adressed in the activity? State the ESLR and explain why in a short paragraph.

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In this activity the ESLR adressed was Critical Thinker. While doing this activity we had to try to figure out where the missing/extra salt went and how we gained/lost it. This caused us to ponder and question how this was possible.

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Materials: 1-2 grams, of NaCl, several pieces of glassware, heating plate, electronic balance,  about 25 mL  of water

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Materials: 1-2 grams, of NaCl, several pieces of glassware, heating plate, electronic balance,  about 25 mL  of water

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Second item was supposed to be a watch glass, but panorama I messed up

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If your percent error was positive, what logical sources of error might have been the cause? Explain. Answer this question regardless of what your results were. 

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If your percent error was positive, what logical sources of error might have been the cause? Explain. Answer this question regardless of what your results were. 

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If our percent is positive, then it means that there are less grams of salt then what we started out with. A logical explanation for the loss of mass is that the salt may have escaped from the beaker and landed on the table. Another explanation is that some salt may have been stuck on the watch glass that is covering the beaker.

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If your percent error was negative, what logical sources of error might have been the cause? Explain. Answer this question regardless of what your results were.

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If your percent error was negative, what logical sources of error might have been the cause? Explain. Answer this question regardless of what your results were.

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If our percent is positive, then it means that there are more grams of salt then what we started out with. A logical explanation for the gain of mass is that there still may be some water still absored in the salt and cup and has not all evaporated yet.