1. Noor Atika
nti
bi binti Ahmad Husnil
nie ed 4 D Khatimah bin
rha am 744 20101037449 ti
Ma oh 103 Hussin
M 0 D
1
D 20 2010 1 037 45 2

3.  Acids are substance that ionize in
aqueous solution to form hydrogen ions
 Bases produce hydroxide ions (OH−)
when they dissolve in water
 Acid and base have their own pH
quantity

4.  Neutralization is the process that
involved between strong acid and also
strong base in order to minimise the pH
back to the normal

7.  Susan are feeling pain in the upper part
of the stomach and abdomen. After
meeting with the doctor, he prescribed
Susan with medicine called antacid
 What happen when base react with
acid?
 How gastritis will occur?
 How antacid neutralise the pH to cure
the gastritis?

8. Objectives :
 To measure the rate of change in pH of
a dilute hydrochloric acid (HCl) solution
when antacid tablets are added to it.
 To compare the neutralization ability of
different types of antacid tablet.

9. Procedure :
 PART 1: Computer Setup
1. Connect the Science Workshop
interface to the computer, turn on the
interface, and turn on the computer.
2. Connect the DIN plug of the pH Sensor
to Analog Channel A on the interface.

10. Connect
to the
sensor
.

11.  PART II: Sensor Calibration and Equipment Setup
1. Remove the pH electrode from its bottle of buffer
solution. Connect the electrode to the pH Sensor
amplifier. To connect the electrode, push the BNC
plug onto the receptacle on the Sensor amplifier
and turn the BNC plug clockwise until it ‘clicks’ into
place.
2. Use the wash bottle to rinse the end of the
electrode. Soak the pH electrode in the beaker of
distilled water for 10 minutes.
3. In the Experiment Setup window, double-click the
pH Sensor icon.

12. 4. Calibrate with the high pH buffer
solution.
5. Thoroughly rinse the pH electrode with
distilled water and dry it with a tissue.
6. Calibrate with the low pH buffer solution.

15. Experiment Setup :

16. Result :
 Graph of pH versus time taken for
antacids to reach final pH.
1) Rennie :

17. 2) Milk of Magnesia

18. 3) Andrews Antiacid

19. 4) Alka Seltzer

20. Discussion :
 Stomach acid is highly acidic and has a
pH of 1.6. Stomach acid is hydrochloric
acid produced by the stomach.
 An antacid is any substance that can
neutralize an acid.
 When an antacid is mixed with an acid
the buffer tries to even out the acidity
and that is how stomach acid gets
neutralized.

21.  Antacids perform neutralization reaction,
i.e. they buffer gastric acid, raising the pH to
reduce acidity in the stomach.
 In an antacid it is not the name brand that
tells how well it works it is something called
an active ingredient.
 Active ingredient of most of the antacids is
bases of calcium, magnesium, aluminium.

22.  Alka-Seltzer is a combination of sodium
bicarbonate, potassium bicarbonate,
and anhydrous citric acid, used for the
relief of heartburn, acid indigestion, and
stomach ache.
 Magnesium hydroxide is an inorganic
compound with the chemical formula
Mg(OH)2

23.  Rennie contain calcium carbonate
element in it.
 Andrew antacids is a combination of
magnesium carbonate and calcium
carbonate, used for the relief of upset
stomach, heartburn, indigestion, and
trapped wind.

24.  What happen when base react with
acid?
When acid and base are combined,
neutralization will occur. Neutralization
occur because the acid and base
properties of H+ and OH- are destroyed
or neutralized

25.  How gastritis will
occur?
Gastritis is an
inflammation,
irritation, or erosion
of the lining of the
stomach.
Gastritis is due to
high concentration
of gastric juice in
the stomach.

26.  How antacid will cure the gastritis?
Anti-acids are medicines containing
bases such as aluminium hydroxide,
Al(OH)3 and magnesium hydroxide,
Mg(OH) 2 to neutralise the excess acid in
the stomach
Mg(OH)2+ HCl → MgCl + 2(H20)

27.  Neutralize Bee and Wasp Stings
have acidic toxins in their stings
an alkaline solution should be
applied to neutralize them
which is baking soda mixed with
cold water

29. allows the monitoring of variables within a
very small or very large timescale.
capture data much faster and much
more frequently than by the hand.
allows for greater accuracy and precision
computer also can process enormous
amounts of data very rapidly.

30.  easier and less complicated than the
manual steps

31.  The data can be easily manipulated and
presented in the form of clearly drawn
graphs.
 The parallax error and human error in
carrying out the experiment can be
avoided resulting in accurate and
precise data taken.