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(Tables made by Aniqa)

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First, we mixed the salt and water solution in a flask

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After we weighed it and recorded the data and waited for the all the water to boil off

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Finally, when it had cooled slightly, we weighed it again on the electronic balance

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Then, we zeroed the flask and measured the weight of the solution in grams

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When all of the water had boiled off, we took it off of the heating plate and let it cool on the counter tops.

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Which ESLR or ESLR’s were  addressed in the activity?

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Which ESLR or ESLR’s were  addressed in the activity?

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The ESLR that was addressed in the activity was "Critical Thinker". We decided it was this because we had to think about how we were able to get a 0% error on all three trials. We figured it we were accurate and precise and that we did everything correctly throughout the experiement.

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If our percent error was negative, what might have caused it?

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If our percent error was negative, what might have caused it?

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If the percent error was negative, that means we lost some salt along the way. The salt could have bounced out while the water was boiling, or we spilled some salt when pouring it out causing us to be inaccurate.

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If our percent error was positive, what might have caused it?

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If our percent error was positive, what might have caused it?

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If the percent error was positive, then it means that extra

salt  was obtained somehow, water was left in the beaker,

or the materials we used were dirty and had objects left

inside of them.

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During the experiment, we had a 0% error on all three trials.

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Your group will need to write their own procedure for the experiment.

Use the lecture on error analysis as a guide.

Include a flow chart that mirrors each step in your procedure

Remember to include all the equipment that you use in your materials list

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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 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.