Materials: pH meter, beaker, water bottle, A-K test samples
Procedure:
It is very important that you clean the pH meter between testing each sample so you don't contaminate the samples
How to clean the pH meter:
Hold the ph meter over the beaker provided to you
Use the water bottle to squirt water on the tip and rinse it off
Using a clean pH meter, put the tip of the pH meter into one of the samples, wait for the reading to stabilize
Put the lid back on the sample
Record the pH reading in your Table below
Clean the pH meter with water over the beaker provided to you
Go to the next sample
Continue this procedure until you have a reading for all of the samples
Do one sample at a time. Be sure to take the lid off and to put the lid back on after each sample to ensure that you don't get your samples mixed up. The materials provided for you are for all of the class sections, please do not waste the samples.
Case Scenario/Question: Suppose you have an upset stomach. What would you recommend or use to calm an upset stomach and why? [Remember that gastric juices are very acidic, pH 1 to 3.]
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Everyone is responsible for clean-up
Be sure all the samples have their lids put on tightly and returned to their tub
The "dirty" water in your beaker from washing your pH meter between testing samples needs to be emptied into the container on the front table marked "waste".
Use a paper towel to dry your beaker before returning it to your tub
Be sure all other materials used in the lab are returned to their original location