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Chemistry lab 17 -prelab

Chemistry lab 17 -prelab - Chemistry Pre-Lab 17 Part I 1...

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Chemistry Pre-Lab 17 Part I. 1. Calibrate the pH Electrode Part II. Titration of a Strong Acid 1. Into a clean and dry 150 mL beaker, and with a carefully rinsed volumetric pipet, dispense a 10.00 mL aliquot of the 0.5 M HCl solution but do not pipet directly from the bottle 2. Add exactly 75.0 mL of distilled water and 3 drops of phenolphthalein solution 3. Fill a clean and carefully rinsed buret with the standardized 0.5 M NaOH solution (record the exact molarity from the label). 4. Record the initial buret reading in your notebook. 5. Remember throughout the experiment that you should record buret readings to the nearest one-hundredth of a milliliter. 6. Remove the pH electrode from the buffer solution. Thoroughly rinse the electrode with distilled water, shake off the drops of water and place it in the acid solution such that the tip is immersed. 7. Stir the acid solution with the pH electrode (be careful not to break the glass tip!) 8. Arrange the buret over the beaker so that the NaOH can be dispensed directly into the acid solution (see Figure Page, Expt. 17). 9. The tip of the buret should be close enough to the surface of the solution such that no splashing occurs as the base is being added.
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10. Click once on the Collect button. 11. Watch the pH reading that appears in the lower left corner of the screen (below the table). 12. When the pH is stable, click on the Keep button. 13. At this point, a box appears into which you must enter a value for “Volume”, that is, the volume of NaOH which has been added as you proceed through the titration. 14. Since you have not added any NaOH at this point, type 0 (zero) and click OK or
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Chemistry lab 17 -prelab - Chemistry Pre-Lab 17 Part I 1...

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