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The Most Effective Antacid Lab

Ms. Hunt 3rd Period Chemistry
by

Lisa Ray

on 3 December 2012

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Transcript of The Most Effective Antacid Lab

The Most Effective Antacid Lab Purpose Variables & Constants Background Information Materials Hypothesis Safety Procedures To become an informed consumer by using the chemistry learned so far to make decisions about which antacid medications to purchase. Determine the effectiveness of the antacid by neutralizing 25.0 ml of hydrochloric acid. Independent:
The brand of antacid, Milk of Magnesia (Saline Laxative).

Dependent:
Mass of antacid necessary to reach a pH of five.

Constants:
Temperature of acid, beaker,amount of acid, type of acid and the desired pH balance. Active ingredient: Magnesium Hydroxide, The active ingredients of milk of magnesia is about 1200 mg.
Inactive ingredients: Purified water and sodium hypochlorite.
Purpose: is used on a short-term basis to treat constipation, It comes as a tablet and liquid to take by mouth.
Chemical Name: The solid mineral form of magnesium hydroxide is known as Brucite.
Formula: Mg(OH)2
Effective Antacid: Liquids with a higher concentration of dissolved hydrogen ions are more acidic, while liquids with a lower concentration of dissolved hydrogen ions are less acidic. The hydroxide ion in milk of magnesia works to bring down the concentration of hydrogen ions in stomach acid. The dissolved hydrogen ion has a negative charge which attracts the positively charged hydrogen ion.
Milk of Magnesia: The other related compounds that are parts of milk of magnesia ingredients are anions, like magnesium oxide and beryllium hydroxide. The cations as ingredients are calcium hydroxide, strontium hydroxide and barium hydroxide.

Magnesium Hydroxide is an inorganic compound with a suspension in water. This is an alkaline suspension, that can undergo a neutralizing reaction when it comes in contact with anything acidic.
Mg 2+ (aqueous) + 2OH - (aqueous) -----> Mg(OH)2 (suspension)
Reaction is excellent for diluting excessive stomach acid, when taken internally. I believe that placing the three grams of antacid into 25ml of hydrochloric acid will increase the pH balance to five. 25ml Hydrochloric acid (How concentrated)
Graduated cylinder
pH Meter
Motor and Pestle
Stir rods
Balance
Milk of Magnesium (Saline Laxative) When working with chemicals be very careful.
Notify teacher if chemicals spills immediately.
Follow instructions carefully.
Never engage in running, pushing and playing during a lab.
Never eat or drink during a lab.
Don't wear loose fitting sleeves or long dangling hair, when working with chemicals tie long hair back.
Clean work are after completing lab.
Be careful with equipment such as test tubes, beakers and any electronics if used.
Treat all chemicals as hazardous. Measure 25ml of HCL into a beaker.
Measure pH of the acid with the meter.
Measure 3 grams of liquid using a weighing dish.
Pour 3 gram of acid into liquid.
Repeat trial four times. Lisa Raymonville
Martine Sanon
Star Riley
Kenya Data Table/ Calculations I believe that placing the three grams of acid into liquid will increase the pH balance to five.
From the looks of our results we reached the pH of seven and above which isn't acidic but more of a base. Based on the hypothesis we surpassed our goal of reaching a acidic pH of five. Results While the solubility of magnesium hydroxide is low, all of the magnesium hydroxide that does dissolve in the water does dissociate. Since the dissociation of this small amount of dissolved magnesium hydroxide is complete, magnesium hydroxide is considered a strong base. Conclusions In Summation, by adding 3 grams of antacid into 25ml of hydrochloric acid, this did not increase the pH balance to five which is acidic instead the reaction resulted in a strong base. Things that can be done to make this lab better the next time around would be adding a smaller amount of antacid to the HCL. This lab relates to life in away that people can learn what is in the medications that they take and how it could effect their bodies. 1. Measured 25ml of hydrochloric acid into beaker then measured the pH of that solution of before mixture.
2. Measured 3 grams of antacid and weighing it in the weighing dish.
3. Then pouring the 3 grams of antacid into the 25ml of hydrochloric acid and using the pippet to gather all the solution and mixing it together.
4. Measure the pH using the meter of after mixture.
5. Repeat those steps four times. The pH balance increased passed five and into the sevens and eights which make it more of a base rather than a acid.
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