Acids, Bases and Stomachs Research Lab [PDF]

But how much antacid is needed? Are all antacids equally effective in neutralizing acid? Let's see. The purpose of today

0 downloads 4 Views 117KB Size

Recommend Stories


LAB “Characteristics of Acids and Bases”
Ask yourself: What do I allow to distract me from really living? Next

Acids, Bases and Salts
Your task is not to seek for love, but merely to seek and find all the barriers within yourself that

Acids and Bases
We can't help everyone, but everyone can help someone. Ronald Reagan

1 Acids and Bases
Seek knowledge from cradle to the grave. Prophet Muhammad (Peace be upon him)

Acids and Bases Acids and Bases Conjugate Pair
I tried to make sense of the Four Books, until love arrived, and it all became a single syllable. Yunus

Acids and Bases Acids and Bases Conjugate Pair Question
Don't count the days, make the days count. Muhammad Ali

acids and Bases: common chemicals
Ask yourself: Do you follow a religion or spiritual practice? Next

Acids and Bases in Solution
If you want to go quickly, go alone. If you want to go far, go together. African proverb

Acids and Bases Are Everywhere
You have survived, EVERY SINGLE bad day so far. Anonymous

Acids, bases and solution equilibria
Kindness, like a boomerang, always returns. Unknown

Idea Transcript


Acids, Bases and Stomachs Research Lab AKA The Antacids Neutralization Lab (Feeling Blue) (Modified from Silver & Burkett Chapter 9 pages 181-187 and Excursion 9-1)

OVERVIEW AND PURPOSE Wherever you go, you carry along a very common acid. Hydrochloric Acid (HCl) is with you all the time. It is made by tiny glands in your stomach. HCl helps digest food. It breaks up large food particles into smaller ones. Sometimes the stomach glands, called gastric glands, produce too much HCl. What happens then? An acid or “sour” stomach produces a kind of burning feeling often called acid indigestion. TV commercials claim that antacid products relieve sour stomach and acid indigestion. These antacid products are supposed to neutralize extra HCl like NaOH neutralized citric acid. The antacid enters the stomach. Then the excess acid there reacts with it to form new substances. In TV commercials, you have probably heard the announcer call this “neutralizing stomach acid.” But how much antacid is needed? Are all antacids equally effective in neutralizing acid? Let’s see. The purpose of today’s lab is to determine the effectiveness of different stomach remedies. You’ll use another indicator called Congo red. With it, you can tell if and when all the stomach acid has been neutralized. MATERIALS Electronic mass scale Congo red 100 ml graduated cylinder 250 ml trial beaker 50 ml beaker (for tap water) large 30 ml air piston glass stirring rod stomach acid (at lab tables marked “HCl”) mortar & pestle for each of antacid A antacid B antacid C antacid D antacid E PROCEDURE 1. Crush 2 antacid tablets in the designated mortar & pestle. 2. With the electronic mass scale, measure 1.0 grams of the antacid. Leave excess antacid powder in the mortar (bowl). 3. Place the 1.0 gram of antacid into the 250 ml trial beaker and add 10 ml water using the 50 ml beaker. 4. Stir with the glass stirring rod until all the antacid powder is dissolved. 5. Add 5 drops of Congo red into the 250 ml trial beaker and stir until blended. 6. Fill the large 30 ml air piston with stomach acid. 7. Add the stomach acid to the 250 ml trial beaker 1 or 2 ml at a time while stirring continuously. 8. As the stomach acid is added to the solution, the color should darken. 9. When the solution changes to grey/blue color, STOP adding stomach acid. (You may have to fill the air piston more than once, so keep track of how much stomach acid is used).

10. Measure the amount of stomach acid used in 1 of 2 ways; either method a or b below. a. Pour trial beaker contents into the 100 ml graduated cylinder and measure total volume. Remember to subtract the original 10 ml of water used in the original antacid solution. b. OR Add the total amount of stomach acid dispensed from the large air piston into the 250 ml trial beaker. 11. Record the total amount of stomach acid used in the Antacid Test Results Table below. 12. Rinse out the 250 ml trial beaker, the stirring rod and the graduated cylinder after each trial to avoid contamination. 13. Repeat the procedure for each antacid sample tested. 14. Upon completion of all samples, wash out all materials used. 15. Then return Congo red and remaining stomach acid to the ‘hood. 16. Put away safety goggles and fold away apron. 17. Answer the analysis section below and be ready to discuss.

ANTACID TEST RESULTS DATA TABLE (Copy in to your notebook)

Name of Substance Tested

Quantity Tested (grams)

Antacid “A” Alka Seltzer

1.0

Antacid “B” Generic Brand

1.0

Antacid “C” Tums

1.0

Antacid “D” Unknown Brand

1.0

Antacid “E” Rolaids

Stomach Acid Added (ml)

1.0

ANALYSIS (Answer these questions in your notebook. Use complete sentences.) 1. Rank order the substances tested from least to most effective.

2. Which substance neutralized the most stomach acid?

3. Should this be the product you select for an acid stomach? Why or why not?

4. What do you think would happen if all the acid in the stomach were neutralized?

Smile Life

When life gives you a hundred reasons to cry, show life that you have a thousand reasons to smile

Get in touch

© Copyright 2015 - 2024 PDFFOX.COM - All rights reserved.