Chemistry Project Acids and Bases

1. Acids and Bases Science
Fair Project 9º
Orlando Lopez Villarreal #14
Ernesto Mattenberger Cervantes #16
Enrique Villa García #25
9ºC

2. Observation
Acid rain is exposed to different factors
like: water, heat, boiling, and to low
temperature. We wonder if this factors, can
make the pH of it to change. We found out it
has almost the same pH as orange juice.

3. Question
Will the pH really change with this
different factors?
Will the change be really drastic, or
only a minor change?
Does it affect the acid by becoming
acidic or making it less acidic?

4. Gather Data
For this project, we will use:
Orange juice
Water
A lamp
Refrigerator
A bunsen burner

5. Hypothesis
We believe that the pH will slightly
change by just a matter of decimals;
whether it changes by hundredths or
maybe tenths as a maximum, but if it
were exposed to more harsh conditions
it could change even more.

6. Experiment
Step 1: Check pH of orange juice.
Step 2: Boil some of the orange juice and
check pH after.
Step 3: Expose the orange juice to a lamp
light for about an hour. (The lamp represents
the sun as if the orange juice was exposed to
sunlight). After this, check the pH.
Step 4: Add some water to the orange juice to
represent the combination of acid and water in
acid rain, about half water, half orange
juice. Check pH afterwards
Step 5: Put the orange juice in the
refrigerator and check the pH after

7. Data from Experiment
Notes:
Step pH - While boiling it, I
noticed as if it
separated, they were
One around 3.5 bubbles at the sides
and in the center was
the pulp
Two same - After adding the
water, it was 50-50 the
concentration of water
Three same with the one of orange
juice, and clearly you
could notice the
Four 4 difference of pH
compared to the first
step
Five same

8. Conclusion
We can say, that this acid will not
change exposed to low or high
temperatures, the refrigerator was
about 4º, and it boiled at almost 50º.
We think, it changed when combined with
water, because it diluted the solution,
making it less concentrated.