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ESLR , "Critical Thinkers" was addressed in the activity. Instead of writing out a lab report, we utilizied current technology and built the lap report on Padlet. We also took our trial results and synthesized the information to calculate the percent error of each trial.

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If our percent error was negative, the logical sources of the error might have been that we didn't evaporated all of the water from the salt and would have given us a higher experimental value than an accepted value, thus giving us a negative percent error.

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If our percent error was positive, our logical sources of error might have been that the salt might have evaporated while it was boiling. Although the watch glass was covering the beaker, the spout of the beaker allowed the salt to escape.

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2. 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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3. 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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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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1. Calculate for your percent error for each trial. Use the Daum Equation Editor to create your equations and add it to your Padlet or Mural report.

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% Error: 0%

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25 mL

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1.55 g

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120.26 g

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118.71 g

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1.55 g

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E: Volume of water added to dissolve NaCl

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D: Mass of recrystallized NaCl (C minus B)

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C: Mass of beaker with recrystallized NaCl

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B: Mass of empty beaker before you start

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

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1. Measure the mass of empty flask in grams

2. Add NaCl into the empty flask

3. Measure the mass of flask with NaCl

4. Measure 25 mL of water in a graduated cylinder

5. Pour salt and measured water into flask and stir

6. Pour dissolved salt into the beaker

7. Place the beaker onto the heating plate

8. Make observations on the beaker

9. Measure beaker with recrystallized NaCl

10. Calculate the percent error

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25 mL

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1.63 g

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124.76 g

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123.13 g

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1.63 g

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E: Volume of water added to dissolve NaCl

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D: Mass of recrystallized NaCl (C minus B)

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C: Mass of beaker with recrystallized NaCl

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B: Mass of empty beaker before you start

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

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% Error: 0%

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% Error: 0%

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50 mL

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E: Volume of water added to dissolve NaCl

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1.54 g

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D: Mass of recrystallized NaCl (C minus B)

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124.67 g

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C: Mass of beaker with recrystallized NaCl

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123.13 g

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B: Mass of empty beaker before you start

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1.54 g

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

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Period 01, Group 03

By: Bryan Nguyen, Tracy Nguyen, and Petar Spasov

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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.