pH of Biological Material Lab
STAMP SETUP (COPY THIS ONTO THE TOP OF YOUR PAPER)
PRELAB
ANALYSIS
CLEAN UP
PRELAB:
1. Define pH, buffer, acid, base
2. List all the safety considerations for this lab.
PROBLEM: How do different materials respond to changes in pH?
HYPOTHESIS: If I add acid drop wise to _______________, then the pH will
________________ (rise/fall) because ______________. (DO THIS FOR 3 ITEMS
LISTED IN THE DATA TABLE)
MATERIALS: List the materials
PROCEDURE: Leave about 10 lines. In your own words state how you did the lab. Be
sure to use list format with numbers. 1.------, 2. -----.
GO BACK AND DO THIS AFTER THE LAB.
DATA: COPY THIS CHART!
SUBSTANCE
0 DROPS
HCl
Water
Milk
Egg
Potato
Liver
Coke
Buffer
5 DROPS
HCl
10 DROPS
HCl
15 DROPS
HCl
20 DROPS
HCl
GRAPH: Make a line graph showing your data above. Use colors to represent the
different substances.
ANALYSIS: Answer in complete sentences.
1. Summarize the effects of HCl on water.
2. Compare Potato, Egg, and Liver to the tap water data.
3. Would buffers aid or hinder in the maintenance of a stable environment in living
organisms, even though the organisms external environment is constantly
changing? Explain
CONCLUSION: USE YOUR LAB REPORT RUBRIC