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4. Which ESLR or ESLR’s were  addressed in the activity? State the ESLR and explain why in a short paragraph. 

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4. Which ESLR or ESLR’s were  addressed in the activity? State the ESLR and explain why in a short paragraph. 

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Part of ESLR that are used in this activity are Responsible Member and Critical Thinkers. The Responsible member part represents how our lab group recrystallized the NaCl together. And Critical Thinking shows how we are incorporating our work into current technology

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Trial #2

A

Mass of salt (NaCl) used. Must be between 1 and 2 grams.

1.53 grams

B

Mass of empty beaker before you start

167.45 grams

C

Mass of beaker with recrystallized NaCl

168.98 grams

D

Mass of recrystallized NaCl (C minus B)

1.53 grams

E

Volume of water added to dissolve NaCl

25 milliliters

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Trial #2

A

Mass of salt (NaCl) used. Must be between 1 and 2 grams.

1.94 grams

B

Mass of empty beaker before you start

48.54 grams

C

Mass of beaker with recrystallized NaCl

50.48 grams

D

Mass of recrystallized NaCl (C minus B)

1.94 grams

E

Volume of water added to dissolve NaCl

25 milliliters

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Trial #1

A

Mass of salt (NaCl) used. Must be between 1 and 2 grams.

1.55 grams

B

Mass of empty beaker before you start

152.69 grams

C

Mass of beaker with recrystallized NaCl

153.89 grams

D

Mass of recrystallized NaCl (C minus B)

1.29 grams

E

Volume of water added to dissolve NaCl

25 milliliters

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3. If your percent error was negative, what logical sources of error might have been the cause? Explain. 

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3. If your percent error was negative, what logical sources of error might have been the cause? Explain. 

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One possibility is that the NaCl was not completely put into the flask, which would decrease the original value we measured. Also another possibility is that when it is being recrystallized some of the NaCl may pop out of the flask because it may boil.

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2. If your percent error was positive, what logical sources of error might have been the cause? Explain.

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2. If your percent error was positive, what logical sources of error might have been the cause? Explain.

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A reason why it could be positive is because that the NaCl absorbed some of the water. If the NaCl absorbed the water, then it is gaining mass. We think that is a possibility in the experiment if it happens

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This is for safety reasons to get the flask out of the heater

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This is where the NaCl and the water and we will be mixing it for it to dissolve.

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We will be using this to recrystallized the NaCl.

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We will be using this to measure the amount of NaCl is present before and after the experiment

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This is very key to our experiment because we are using this to recrystallize the NaCl

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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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Jack Hughes,

Dylan Nghiem