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Fruity AcidityAnother project by:Another project by:

Loh Wei Kiat (1I3, 12)Yeo Kee Xuan (1I1, 25)Jason Chow (1I3, 07)

Chew Tian Le (1I3, 02)

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AgendaBackground InformationAimHypothesisTarget AudienceApparatusExperimentResultsConclusionProductReflectionsProject Follow-UpsAcknowledgements and ReferencesQ & A

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About pH levelspH levels are a measure of acidity or alkalinity,

with 1 being the most acidic, and 14 being the most alkaline.

pH 7 is considered as pH neutralPure water has a pH level of pH neutralCertain organisms only grow in environments

with certain pH levels, or they will die

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pH levelsOur optimum blood pH level is at 7.35-7.45.

Anything below 6.8 or above 7.8 is fatal.Extreme pH levels may lead to

- Weight gain- Brittle Bones- Weak Muscles- Slow Digestion

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Acidosis

Acidosis is:The result of eating too much acidic foodMay also be due to kidneys not extracting

acid effectively enoughThese cause the pH level of the body to

decrease too muchUsually occurs when pH level is below 7.35

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AlkalosisAlkalosis is:The result of vomiting too much, over-

dehydration or high consumption of alkaliThese cause the pH level in the body to

increase The exact opposite of acidosisUsually occurs when the pH level is above 7.45

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Our Aim

To find out whether the temperature of the fruit will affect the pH of it.

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Hypothesis As heating may make the fruit lose some of its

nutrients, it is most likely that as fruits are being heated up, their pH will gradually increase.

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Target Audience

People who take fruit.People with unhealthy pH levelsThis project will allow those people to

understand the best fruits to consume at the best temperature to ensure maximum nutrition to the person.

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Apparatus/Fruits Used3 Oranges3 Mangos3 Watermelons3 PapayasThermometerChopping BoardChopperSqueezerpH papers and pH

meter

Blocks of IceIce BoxBunsen BurnerIgniterTripod StandWire Gauze MatGas TapBeakerFruit Knife

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ExperimentTo find out pH of fruits at room temperature.Step 1:Measure the room temperature using a

thermometer.Step 2: Cut an orange into 2 using the chopper and

chopping board.Step 3: Squeeze both the half-oranges using the

squeezer.Step 4: Juice from the orange would be obtained.

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ExperimentStep 5: Dip a pH paper into the juice to measure the

pHStep 6: Record the result.Step 7: Repeat the experiment with the 3 other

fruits.Room Temperature: 27.5oC

Fruit pH

Orange 5

Mango 6

Papaya 6

Watermelon 7

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Experiment

To find out pH of fruits when frozen.Step 1: Put 1 of each fruit in the ice box along with

blocks of ice to keep the fruit cold. Step 2: Wait for the temperature in the icebox to

reach a stable amount.Step 3: Measure the temperature using the

thermometer.Step 4: Cut an orange into 2 using the chopper and

chopping board.

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ExperimentStep 5: Squeeze both the half-oranges using the

squeezer.Step 6: Juice from the orange would be obtained.Step 7: Dip a pH paper into the juice to measure the

pHStep 8: Record the result.

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Experiment

Step 9: Repeat the experiment with the 3 other fruits.

*To ensure that the experiment is done fairly while not exposing to much room temperature, fruits are cut before placing in the ice box to ensure minimal exposure to outside temperature.

Fruit pH

Orange 5

Mango 6

Papaya 6

Watermelon 7

Cooled Temperature: 14oC

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ExperimentTo find out pH of fruits when heated.Step 1: Cut an orange into 2 using the chopper and

chopping board.Step 2: Squeeze both the half-oranges using the

squeezer.Step 3: Juice from the orange would be obtained.Step 4: Pour the juice into the beaker.

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Experiment

Step 5: Using the Bunsen burner, igniter, tripod, gas tap, beaker and wire gauze mat, heat the juice to 75oC.

Step 6: Dip a pH paper into the juice to measure the pH when it is at 75oC.

Step 7: Record the result.

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ExperimentStep 8: Repeat the experiment with the 3 other

fruits.

Heated Temperature: 75oC

Fruit pH

Orange 6

Mango 7

Papaya 6

Watermelon 6

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Results

Fruit Normal pH (27.5oC)

Cooled pH (14oC)

Heated pH (75oC)

Orange 5 5 = 6

Mango 6 6 = 7

Papaya 6 6 = 6 =

Watermelon 7 7 = 6

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Effects on Temperature on the pH LevelOf fruits

pH level

Temperature/°C

0 10 20 30 40 50 60 70 80 90 100

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5

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7

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Orange

Watermelon

Mango

Papaya

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Results

Our results show that:the pH level increases when the temperature

increases(mango, orange)the pH level remains the same when the

temperature increases (papaya)the pH level decreases when the temperature

increases (watermelon)

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ConclusionFrom our results, we can conclude that: An increase in temperature usually means an increase in pH for most fruitsDecrease from room temperature does not really affect the pH Level greatly. For people who want to achieve pH neutral, it is best to eat watermelon at room or cooled temperature.It may be good to eat warmer oranges or watermelons, even though some nutrients is lost during warming.

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Some Experimental Pictures

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Some Experimental Pictures

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Product• Our product will be our findings presented in

web report, as the internet is a commonly used platform for people nowadays.

• We used WetPaint so it would be easier for us to reach out to the IT-saavy public.

• The Uniform Resource Locator (URL) for our WetPaint website is:http://fruityacidity.wetpaint.com

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Reflections

Throughout this experimental research project, we encountered many problems like insufficient time and apparatus, especially when doing the experiment itself. However, the team worked as one and finally managed to overcome all difficulties.

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Dirty FloorDirty Shirt

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Follow UpsWe would be :- Improving on our web report on our WetPaint site.- Introduce the web report to others through other

platform such as Wikispaces, Facebook, Blogs etc.- Finding the pH of more common fruits like apple,

cranberries etc.- Why such results occur (Eg. Why doesn’t the pH of

papaya change, why does watermelon’s pH drop while the other 2 increases?

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Acknowledgements Our mentor, for guiding us along on, booking

a science lab for us and supervising us during the whole experiment procedure.

Science Lab Technicians who also helped to supervise and help us out in certain parts of the experiment

Any others who may have helped us in one way or another

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References- http://www.chem.purdue.edu/sciexpress/Workshop%20Labs/Vernier/Ho

w%20Does%20pH%20Paper%20Work%20-%20sarah.doc. Accessed on 12th June 2010

- Fruity Freezer Treats: http://www.dvo.com/newsletter/monthly/2009/july/tabletalk2.html

- http://scientificsonline.com/product.asp_Q_pn_E_3021313_A_cmc_E_CROSS_SELL_A_pH+Paper,+Pkg.+of+100 Accessed on 12th June 2010

- http://www.youtube.com/watch?v=f8yWJHCkdJU Accessed on 12th June 2010

- Wikipedia, The Free Encyclopaedia (2010). pH http://en.wikipedia.org/wiki/PH Accessed on 2nd June 2010

- Wikipedia, The Free Encyclopaedia (2010). pH Indicator http://en.wikipedia.org/wiki/PH_indicator Accessed on 2nd June 2010

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Reference- Wikipedia, The Free Encyclopaedia (2010). Litmus Paper

http://en.wikipedia.org/wiki/Litmus_paper Accessed on 2nd June 2010

- Acid Soil: http://www.thegardenhelper.com/acidsoil.html Accessed on 11th June 2010

- Alkalinity: http://www.aquachek.com/PublicPopups.asp?action=displayparameter&PAID=9 Accessed on 11th June 2010

- Monitoring your Body ’s pH: http://altered-states.net/barry/update178/index.htm Accessed on 11th June 2010

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Thank you for your Kind Attention!