The pH values of common drinks like Coke, milk, apple juice, black coffee, and lemon tea were measured before and after being exposed to the environment for one week. The pH of all drinks decreased after one week of exposure, with the largest decreases in apple juice, lemon tea, and milk. The hypothesis that the pH of drinks would change with exposure over time was accepted.

1. pH Value In Exposed
Common Drinks
AHMAD NUR FAIZ BIN ABU BAKAR
D20101037414
MUHAMMAD SHAMIM BIN ZULKEFLI
D20101037460
SITI RUKAIYAH ABD FATAH
D20101037479

2. ph value of common drinks
will change when exposed to
surrounding

3. Engage
Do the pH value of common
drinks will changes when the
food are exposed to
environment in long period
of time.

4. Empower
Methods Results

5.  Take 50 ml of liquid sample 1.
 Gently agitate the pH probe in each liquid for
a minute or two while the pH reading settles
then record the reading in the table A.
 Then, the liquid leaves for a week.
 The experiment is repeat for each other
drinks water sample.
NOTE : Take care to thoroughly clean the pH
probe in a large container of water between
each liquid to reduce cross contamination of
the liquids.
 After a week, the pH of the liquids is taken.

6. HOME

7. Food Sample pH pH (after a week)
Coke 2.61 2.24
Milk 6.76 4.40
Apples juice 3.49 1.84
Black coffee 5.51 5.42
Lemon tea 3.73 2.65

8. Graph of pH Before vs pH After a Week
7
6
5
4
3
2
1 pH
0 pH (after a week)

9.  The value of the common drinks are changes
especially apple juices, lemon tea and milk.
 This because when this liquid are exposed to
surrounding to long period of time, the liquid
maybe will stale.
 Besides, this liquid always will exposed to the
temperature. The changes of temperature will
changes the pH of liquids.

10.  The hypothesis was accepted.
 The pH of all liquid sample was changes
although in small amount of changes.
 Many factors that can make the pH of liquids
sample changes for example temperature.
 Maybe the liquids sample was contaminated by bacteria
or others at surrounding.

11. Enhance
 To determining tooth decay and dental erosion.
 Dental erosion occurs when tooth enamel (and dentine)
are destroyed by the action of acid on teeth. This is a
different process to the damage caused by acid from
decay producing bacteria.
 Unlike tooth decay, erosion affects the whole surface of
the tooth. Exposure to acid over a long period of time
leads to progressive loss of enamel with the effect that the
tooth ‘shrinks’ and crumbles at the biting edge.
Eventually the dentine is exposed leading to pain and
sometimes death of the tooth.
 Several common drinks fall below the ‘safe’ recommended
pH level of 5.5. In order to minimize damage the following
dental recommendation should be followed.