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1) If your percent error was positive it means you lost salt somewhere in the experiment. Reasons for losing salt are, not rinsing out the remaining salt particles left in the flask. Also when you are boiling the water it bubbles and pops, so when the water was popping it is possible that the water got out of the graduated cylinder and salt particles were in the water that escaped.

2) If your percent error was negative it means that there was more grams added to the experiment in someway. Grams could have been added by not rinsing out the graduated cylinder before you started your trial, which means that there might have still been some left over salt particles from the previous experiments. Also, if you didn't let the water evaporate for the correct amount of time the grams could have been added by the amount of water still left in the graduated cylinder.

3) The ESLR we think is used in this project is Critical Thinker. Throughout this experiment we needed to figure out all the mistakes and errors that  took place while working. We had to combine our knowledge and figure out what we did wrong when doing the recrystallization. We also had to make sure that we got the right calculations and make sure that we got the right percent error.

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NaCl. Use a mass of about 1-2 grams.

Several pieces of glassware

Heating plate

Electronic balance

Water. Use about 25 mL

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Recrystallization of NaCl

CPIPS

Mr. Ginex-Orinion

Pre Lab Discussion:

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.

Purpose:  You will learn to

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 Experiment CPIPS 2013  Group 9   Period 5     

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Recrystallization Experiment CPIPS 2013  Group 9   Period 5     

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Mellisa Kittredge Minh Nguyen