1. Noor Atika nti bibinti Ahmad Husnilnie ed 4 D Khatimah binrha am 744 20101037449 tiMa oh 103 HussinM 0 D 1D 20 2010 1 037 45 2

2. Acids are substance that ionize inaqueous solution to form hydrogen ions Bases produce hydroxide ions (OH)when they dissolve in water Acid and base have their own pHquantity 3. Neutralization is the process thatinvolved between strong acid and alsostrong base in order to minimise the pHback to the normal 4. Susan are feeling pain in the upper partof the stomach and abdomen. Aftermeeting with the doctor, he prescribedSusan with medicine called antacid What happen when base react withacid? How gastritis will occur? How antacid neutralise the pH to curethe gastritis? 5. Objectives : To measure the rate of change in pH ofa dilute hydrochloric acid (HCl) solutionwhen antacid tablets are added to it. To compare the neutralization ability ofdifferent types of antacid tablet. 6. Procedure : PART 1: Computer Setup1. 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. 7. Connectto thesensor . 8. PART II: Sensor Calibration and Equipment Setup1. 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 thepH Sensor icon. 9. 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. 10. Experiment Setup : 11. Result : Graph of pH versus time taken forantacids to reach final pH.1) Rennie : 12. 2) Milk of Magnesia 13. 3) Andrews Antiacid 14. 4) Alka Seltzer 15. Discussion : Stomach acid is highly acidic and has apH of 1.6. Stomach acid is hydrochloricacid produced by the stomach. An antacid is any substance that canneutralize an acid. When an antacid is mixed with an acidthe buffer tries to even out the acidityand that is how stomach acid getsneutralized. 16. Antacids perform neutralization reaction,i.e. they buffer gastric acid, raising the pH toreduce acidity in the stomach. In an antacid it is not the name brand thattells how well it works it is something calledan active ingredient. Active ingredient of most of the antacids isbases of calcium, magnesium, aluminium. 17. Alka-Seltzer is a combination of sodiumbicarbonate, potassium bicarbonate,and anhydrous citric acid, used for therelief of heartburn, acid indigestion, andstomach ache. Magnesium hydroxide is an inorganiccompound with the chemical formulaMg(OH)2 18. Rennie contain calcium carbonateelement in it. Andrew antacids is a combination ofmagnesium carbonate and calciumcarbonate, used for the relief of upsetstomach, heartburn, indigestion, andtrapped wind. 19. What happen when base react withacid?When acid and base are combined,neutralization will occur. Neutralizationoccur because the acid and baseproperties of H+ and OH- are destroyedor neutralized 20. How gastritis willoccur?Gastritis is aninflammation,irritation, or erosionof the lining of thestomach.Gastritis is due tohigh concentrationof gastric juice inthe stomach. 21. How antacid will cure the gastritis?Anti-acids are medicines containingbases such as aluminium hydroxide,Al(OH)3 and magnesium hydroxide,Mg(OH) 2 to neutralise the excess acid inthe stomach Mg(OH)2+ HCl MgCl + 2(H20) 22. Neutralize Bee and Wasp Stings have acidic toxins in their stingsan alkaline solution should beapplied to neutralize themwhich is baking soda mixed withcold water 23. allows the monitoring of variables within avery small or very large timescale.capture data much faster and muchmore frequently than by the hand.allows for greater accuracy and precisioncomputer also can process enormousamounts of data very rapidly. 24. easier and less complicated than themanual steps 25. The data can be easily manipulated andpresented in the form of clearly drawngraphs. The parallax error and human error incarrying out the experiment can beavoided resulting in accurate andprecise data taken.