1 fruity acidity another project by: loh wei kiat (1i3, 12) yeo kee xuan (1i1, 25) jason chow (1i3,...
TRANSCRIPT
1
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)
2
AgendaBackground InformationAimHypothesisTarget AudienceApparatusExperimentResultsConclusionProductReflectionsProject Follow-UpsAcknowledgements and ReferencesQ & A
3
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
4
5
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
6
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
7
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
8
Our Aim
To find out whether the temperature of the fruit will affect the pH of it.
9
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.
10
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.
11
Apparatus/Fruits Used3 Oranges3 Mangos3 Watermelons3 PapayasThermometerChopping BoardChopperSqueezerpH papers and pH
meter
Blocks of IceIce BoxBunsen BurnerIgniterTripod StandWire Gauze MatGas TapBeakerFruit Knife
12
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.
13
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
14
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.
15
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.
16
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
17
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.
18
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.
19
ExperimentStep 8: Repeat the experiment with the 3 other
fruits.
Heated Temperature: 75oC
Fruit pH
Orange 6
Mango 7
Papaya 6
Watermelon 6
20
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
21
Effects on Temperature on the pH LevelOf fruits
pH level
Temperature/°C
0 10 20 30 40 50 60 70 80 90 100
1
2
3
4
5
6
7
8
Orange
Watermelon
Mango
Papaya
22
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)
23
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.
24
Some Experimental Pictures
25
Some Experimental Pictures
26
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
27
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.
28
Dirty FloorDirty Shirt
29
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?
30
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
31
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
32
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
33
34
Thank you for your Kind Attention!