Digital Investigation: Ph Scale And Acid/base Strength Chemistry Worksheet Page 2
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2Name:
Hour:
Date:
PART B: PhET Simulation “Acid Base Solutions” – choose “INTRO”
1. Determine the pH for all of the following substances using the first tool.
Water: _______
Strong acid: _______ Weak acid: _______ Strong base: _______ Weak base: _______
2. Click on the second box in “tools” to get the litmus paper. Dip the litmus paper in the following
solutions and describe what you see and what it means:
a. Strong acid
b. Strong base
c. Water
3. a. What molecules are present in a strong acid? Why?
b. Draw a picture of a strong acid in the circle provided below. Include a key. (Color is good!)
4. a. What molecules are present in a weak acid? Why?
b. Draw a picture of a weak acid in the circle provided below. Include a key. (Color is good!)
WEAK ACID
STRONG ACID
KEY
KEY
Answer the following questions again. Explain WHY you made your choice using EVIDENCE from above.
My response:
a. The most dangerous acids have the highest pH.
Always True Always False Sometimes True
My group’s response:
Always True Always False Sometimes True
My response:
b. Soda pop has a similar pH to stomach acid.
Always True Always False Sometimes True
My group’s response:
Always True Always False Sometimes True
c. Strong bases have a higher pH than weak bases.
My response:
Always True Always False Sometimes True
My group’s response:
Always True Always False Sometimes True
d. Diluting an acid with water will cause the pH to decrease.
My response:
Always True Always False Sometimes True
My group’s response:
Always True Always False Sometimes True
My response:
e. A solution of a weak acid will have a high concentration of H
O
+
3
Always True Always False Sometimes True
My group’s response:
Always True Always False Sometimes True
PART C: FURTHER RESEARCH: How many strong acids exist? Name them all. Which one exists in our
bodies? What does it do?
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