Investigating the Properties of Ph

Topics: PH, PH indicator, Acid Pages: 3 (649 words) Published: January 22, 2012
Investigating the Properties of pH
The manufacture’s claim is that Sensodyne toothpaste micro hardens tooth enamel to help protect against the effects of acid wear, helps stop the twinges of pain from sensitive teeth formulated with low abrasivity, neutral pH and gentle yet effective cleaning system.

To find out if the manufactures claim on Sensodyne toothpaste is the correct level of pH.
I expect the Sensodyne toothpaste to be a neutral pH level as the manufactures claim that this products pH level is neutral. This would be indicated by a level of pH 6 and 7.

The equipment needed for this practical
* Sensodyne (toothpaste)
* Universal indicator
* Universal paper
* pH meter
* Petri dish x 3
* Measuring cylinder x 6
* Wooden stick
* Distilled water
* Tap water
* Ruler

1. Test the distilled water and tap water for the pH level to see if it were neutral so it wouldn’t make a difference to the results. 2. Set up 3 petri dishes and 3 measuring cylinders
3. Measure 10mls of tap water. Add water to the petri dish and add 5cm of Sensodyne (toothpaste) into each petri dish and repeat this step 3 times. 4. Measure 10mls of distilled water and add to the measuring cylinders as well as adding 5cm of Sensodyne (toothpaste) and repeat this step 3 times.

5. Mix the substances together with the wooden stick.
6. Put universal indicator (liquid) into the petri dish repeat this step 3 times. Record the results from each petri dish. 7. Put universal indicator (paper) into the measuring cylinder repeat this step 3 times Record the results from each measuring cylinder. 8. Set up pH meter, Put the pH meter into the measuring cylinder record the pH reading and repeat this step 3 times for a reliable.

Results Table

Universal Indicator Universal Paper pH Meter

Test 1 pH6 6...
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