8.11 Investigation: Testing Antacids The Chemistry of your GUT: How do you Spell RELIEF?

Frequently Asked Questions: Perform Investigation 8.11 Lab groups of Three Individual Lab Report (yes silly, it will be marked) Report Absolute Deadline: TBA

Assessment: Part 1: In-Class Lab Performance Follow procedures efficiently and competently. Use appropriate equipment with skill and proper regard for safety. Record all relevant observations. Work effectively with your partner in an independent effort without interactions with other groups.

Assessment: Part 2: Individual Lab Report Follow Fletcher’s Meadow Science Lab Write-Up Rubric. Details to follow.

Your Stomach: What’s an ingredient of gastric juice? Large crescent shaped hollow organ the size of a melon Produces gastric juice What’s an ingredient of gastric juice?

How strong is the hydrochloric acid in your stomach? Answer: pH of normal stomach is about 2; This is acidic enough to dissolve metal and damage most things it touches.

What happens if there is too much acid in your stomach? ACID INDIGESTION = HEARTBURN

60 million Americans experience heartburn monthly FREAKY FACT: 60 million Americans experience heartburn monthly and 15-25 million Americans experience heartburn daily.

Antacids: ONE SOLUTION? Is an antacid an acid or a base? A mild base that can neutralize acid

A typical pharmacy may offer 30 different antacids to choose from. CONSUMER REPORT: A typical pharmacy may offer 30 different antacids to choose from. Which one do you choose? TURN TO YOUR TEXTBOOK: PAGE 320

Are all antacid tablets equally effective? QUESTION: How do antacid tablets compare in their acid-neutralizing ability to baking soda? Are all antacid tablets equally effective?

HYPOTHESIS: If the neutralizing ability of baking soda is compared with the neutralizing ability of an antacid tablet the ability of the ___________ will be better because …

HYPOTHESIS: __________ antacid tablets will neutralize better because ___________...

MATERIALS: safety googles baking soda balance 100 mL beaker(s) water 10-mL graduated cylinder

MATERIALS: pH probe stirring rod hydrochloric acid solution dropping pipette various antacid tablets mortar and pestle

PROCEDURE: Refer to the textbook. For your report use a lab flowchart.

RESULTS: Type of Antacid Tablet (Pick any 3) Baking Soda Name1 Name 2 Initial Mass of Antacid (g) Mass of Antacid Reacted # of drops of Acid

HOMEWORK: 1. Complete Hypothesis

2. Prepare CHART HOMEWORK: Type of Antacid Tablet (Pick any 3) Baking Soda Name1 Name 2 Name 3 Initial Mass of Antacid (g) Mass of Antacid Reacted # of drops of Acid 2. Prepare CHART

Procedural FLOWCHART for steps 5,6,7 on page 321 HOMEWORK: Procedural FLOWCHART for steps 5,6,7 on page 321 ** This will take some time to develop a reasonable outline that you can follow without using your textbook during the lab tomorrow!