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Summary pH lab
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Summary of 6 pages for the course Science at 9th Grade (ph lab)
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1pH Lab
Jonathan S, Jonathan T, Maria, and Sami
St. Joseph CES, Markham
Grade 8 Science
Ms. Croce
Friday, May 13, 2022
, 2
Introduction
For this experiment, what we had to do is test the acidity of liquids using a pH strip. The acidity
of a liquid is determined by its color, which matches to the pH scale. If a liquid has a pH of 7 or
higher, it is alkaline, if it has a pH of below 7, it is acidic, and lastly if it has a pH of 7, it is
neutral. Measuring the acidity of certain liquids is very important because if a liquid is too
acidic, it may be bad for our health. For example, an everyday liquid such as water, if it is too
acidic, we can not drink it because it would be harmful. Another thing to consider is that if water
is too alkaline and has a high pH, it could cause skin problems such as itchiness, irritation, and
dry skin. That is why measuring the acidity of liquids, especially water, is very important to us
and our health.
Hypothesis
Before experimenting, we speculate that the lemon juice will have the most acidity out of the
liquids. From prior knowledge, we know that lemon juice is naturally acidic due to a high
amount of citric acid, which is what makes some candies sour. Similar to the lemon, the orange
juice is acidic. Being a citrus fruit, we can hypothesize that it will be acidic. Along with lemon
and orange juice, we believe that the vinegar and soy sauce will be acidic due to it being
fermented. In consideration of the other liquids, we believe that they will not be as acidic.
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