Transcript 2-24-10 pH

2/24/10
Share
homework with
lab partners.
Directions: Fill in the blanks using the word bank provided to explain the pH
demonstration you saw today in class.
WORD BANK
cabbage
base
violet
green
pH
acid
red
neutral
indicator
changing
It’s not magic, it’s __________. The liquid in the first glass
stayed the same when the __________ juice was added and this
meant that it was __________. The liquid in the second glass
turned __________ meaning that it was an __________. Finally,
the liquid in the third glass turned __________ which meant that
the liquid was a __________. __________ colored cabbage juice
is an __________. It indicates whether a substance is acidic,
basic, or neutral by __________ colors.
Today’s Agenda
• Warm-Up: pH Demonstration Explanation
Check and Review
• Classwork:
– Cabbage Patch Indicator Lab Activity
– What is pH? Read article and answer
questions in complete sentences.
• Homework:
– What is pH? Read article and answer
questions in complete sentences. (Due Friday)
• Conclusion:
– What is the pH of acids and bases?
Student Objective
Saturday, April 9, 2016
Students will be able to…
• Use information gathered
from investigations to
classify materials as acidic,
basic, or neutral using the
pH scale.
1.
2.
3.
4.
5.
6.
7.
Number the
substances from
1-12 as it has
been done on the
one to the left.
Predict the pH of each
substance by determining
whether you think each
substance is a…
8.
Strong Acid (pH 1-3)
9.
10.
11.
12.
Weak Acid (pH 4-6)
Neutral Substance (pH 7)
Weak Base (8-10)
Strong Base (11-14)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Carefully fill
each well about
half-way with
the correctly
numbered
substance.
Cabbage Patch Indicator
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Acid
Neutral
Base
1. Carefully fill the wells halfway with all of the
substances.
2. Return to your seat and place your substances
in the center of table.
3. Add 5-6 drops of cabbage juice to each sample.
4. Compare each sample to your cabbage juice
color chart and record your results on your lab
worksheet.
5. Clean up your lab area (neater than it was to
begin) and use any remaining time to complete
your lab worksheet.
Use the pH scale to determine what
Quick
practice
measuring
substance is in each test tube during
pH using
a pH Scale…
this computer
simulation.
http://www.harcourtschool.com/activity/acids/
pH 10
pH 13
pH 7
pH 9
+ or –
1 pH
factor.
pH 7
pH 3
pH 7
pH 7
pH 5
pH 7
pH 11
pH 4
Change
your
answer
if it is
off by
more
than 1.
The strongest base we tested
during this lab activity was _____.
A. Cheer
B. Distilled Water
C. Sugar
D. Vinegar
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Acid
Grapefruit J
Vitamin C
Vinegar
Aspirin
Lemon J
Soda
Orange J.
Neutral
Distilled water
Alcohol
Cornstarch
Salt
Sugar
Base
Baking soda
Toothpaste
Antacid
Cheer
Shampoo
Ammonia
Dish soap
Limestone
Lemon
Juice
Rubbing
Alcohol
Vinegar
Salt
Soda
Dish
Soap
Corn
Starch
Baking
Soda
Sugar
Distilled
Water
Ammonia
Cheer
1.
10
Base
2.
13
Base
3.
7
9
Neutral
Base
6.
7
3
Neutral
Acid
7.
7
Neutral
8.
7
5
Neutral
Acid
7
11
4
Neutral
Base
Acid
4.
5.
9.
10.
11.
12.
0-6.9
7.1-14
7.0
Lemon Juice, Soda, and Vinegar
Baking Soda, Cheer, Dish Soap, and Ammonia
Corn Starch, Distilled Water, Rubbing Alcohol, Salt, and Sugar
1st – Lemon Juice
1st – Cheer
2nd – Vinegar
2nd – Ammonia
3rd - Soda
3rd – Baking Soda
Read What is pH? Answer the
9 question on back using
complete sentences.
**Also indicate which section your
answer came from.
DUE FRIDAY – Answer questions 1-5 tonight and 6-9
tomorrow night…or do all 9 tonight…don’t procrastinate!
HOMEWORK
“What is pH?”
Read Article and
answer Questions
Always copy daily homework into your agenda.
???
With a pH below 7…lemon juice,
soda, and vinegar can all be
classified as ____.
A. Acidic
B. Basic
C.Neutral
D.Unknown
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