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Mass of recrystallized salt and the beaker

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Mass of recrystallized salt and the beaker

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Mass of recrystallized salt and the beaker

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Mass of recrystallized salt and the beaker

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1.BEAKER.

2.GRADUATED CYLINDER.

3.FLASK.

4. HEATING PLATE.

5.WATCH GLASS.

6.TONGS.

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1. First we gathered all the materials which were the beaker, graduated cylinder, heating plate, watch glass, tongs, and the flask. We made sure they were clean, and we were ready to start.

2. We put water in the graduated cylinder.

3. Then we put salt in the flask and made sure it was 1-2 grams. We even measured the Beaker with the watch glass.

4. We dumped the water into the flask with the salt, and mixed it around a little.

5. Once it was mixed we put the salt water in the beaker, and we put the beaker on the heating plate.

6. We waited for about 15 minutes to make sure all the water was boiled out.

7. Once it was done we cooled it off.

8. Lastly, we measured the beaker and did the math to see if we lost or gained salt.

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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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The ESLR that was addressed in this activity is critical thinker. The bullet point we're using is Develop Educated opinion and make well informed choices. Why this applies to this activity is, because we had to take an educated guess on what might have happened to the salt during the activity.

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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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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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Although we did not get a negative percentage, a logical explanation as to why other people might have is because they did not boil off all the water. As a result, the salt is still damp and contains water, making the mass heavier.

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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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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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A main reason as to why we lost salt is due to the violent bubbling when evaporating the water. Salt may have flown out through the opening of the beaker even with the watch glass on top of it.

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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

Materials:

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

Several pieces of glassware

Heating plate

Electronic balance

Water. Use about 25 mL

Your materials list will be images added and organized in your Padlet or Mural.ly wall. Please make sure it is a complete list of the equipment and materials that you used.

Procedure:

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

Data:

Create a data table that will include all the masses and volumes that you have measured in the experiment. Make sure there is a data table for each trial.

Examples: mass of empty beaker, mass of NaCl before experiment, mass of NaCl after experiment, volume of water used, etc.

If you do more than 1 trial, please include the results for each trial. Use 1 table for each trial.