Science Fair 2013

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Chemistry Project Acids and Bases

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Science Fair 2013

  1. 1. Acids and Bases ScienceFair Project 9ºOrlando Lopez Villarreal #14Ernesto Mattenberger Cervantes #16Enrique Villa García #259ºC
  2. 2. ObservationAcid rain is exposed to different factorslike: water, heat, boiling, and to lowtemperature. We wonder if this factors, canmake the pH of it to change. We found out ithas almost the same pH as orange juice.
  3. 3. QuestionWill the pH really change with thisdifferent factors?Will the change be really drastic, oronly a minor change?Does it affect the acid by becomingacidic or making it less acidic?
  4. 4. Gather DataFor this project, we will use:Orange juiceWaterA lampRefrigeratorA bunsen burner
  5. 5. HypothesisWe believe that the pH will slightlychange by just a matter of decimals;whether it changes by hundredths ormaybe tenths as a maximum, but if itwere exposed to more harsh conditionsit could change even more.
  6. 6. ExperimentStep 1: Check pH of orange juice.Step 2: Boil some of the orange juice andcheck pH after.Step 3: Expose the orange juice to a lamplight for about an hour. (The lamp representsthe sun as if the orange juice was exposed tosunlight). After this, check the pH.Step 4: Add some water to the orange juice torepresent the combination of acid and water inacid rain, about half water, half orangejuice. Check pH afterwardsStep 5: Put the orange juice in therefrigerator and check the pH after
  7. 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. 8. ConclusionWe can say, that this acid will notchange exposed to low or hightemperatures, the refrigerator wasabout 4º, and it boiled at almost 50º.We think, it changed when combined withwater, because it diluted the solution,making it less concentrated.

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