NAME
:
INSTRUCTIONS:
Use the resources at your table to help you
answer the questions on this worksheet.
One worksheet from your group will be
chosen at random at the end of today’s class.
SECTION 1: ACIDS AND BASES.
(15 minutes)
1. Compare and contrast acids and bases. (Hint: You may use a T-chart; Venn diagram or
written paragraph.) Make sure to include similarities / differences in:
i. The taste of each substance
ii. The Bronsted-Lowry definition
iii. The Lewis definition
iv. The Arrhenius definition
v. Information about reactions
vi. Indicator changes
vii. pH or pOH
viii. Examples
SECTION 2: INDICATORS (15 minutes)
1. What happens when you put the indicator at your station into acid?
2. What happens when you put the indicator at your station into a base?
3. What are indicators?
4. Imagine that you collect two colorless substances for an experiment. You know that one
is an acid and the other is a base. Explain how you can use a specific indicator (include
the name of the indicator) to tell which substance is a base and which is an acid. (Hint:
You may use a comic strip, numbered steps or a letter format to answer)
SECTION 3: CALCULATING pH and pOH (30 minutes)
1. Calculate the pH of each of the following. In each case, state whether the substance is
an acid, a base, or neutral.
a. A solution with H+ concentration 0.1M.
b. A solution with H+ concentration 0.00001M
2. Calculate the pOH of
a. A solution with OH- concentration 0.1M
b. A solution with OH- concentration of 0.00001M
3. Calculate the pH of a solution with a pOH of 2.
4. Calculate the pOH of a solution with a pH of 4.
5. Cherry coke has a H+ concentration of 0.003. Is cherry coke acidic or basic? Why
6. Lime scale often forms on faucets. It has a pH of 9. What type of substance could be
used to remove lime scale from faucets? Explain why.
7. The fluids in the stomach cause pain (heartburn) when they enter the esophagus. These
fluids have a pH between 1 and 4.
a. Are the fluids in the stomach acidic or basic? How do you know this?
b. Doctors often recommend antacids for heartburn. What do you think antacids are
made of? Why would antacids help with heartburn?
INSTRUCTIONS:
NAME
:
Use the resources at your table to help you answer the
question on this worksheet.
Use the rubrics to guide you. You have 60 minutes.
One product from your group will be chosen at random at
the end of today’s class.
Question:
How do the properties of acids and bases make them useful and important
in our daily activities?
Rubrics:
Includes vocabulary terms
Guidelines
Lists definition, example and
real world application of the
vocabulary words.
Maximum score
10
(Acid, base, pH, pOH, indicator,
hydronium, hydroxide, indicator,
neutralize, alkaline, Arrhenius,
Bronsted-Lowry, Lewis)
Compares and contrasts
acids and bases
Demonstrates understanding
of the differences and
similarities between acids
and bases.
Outlines the use of indicators Explains how indicators are
used and lists examples of
indicators.
Demonstrates calculations of Gives examples of
hydronium and hydroxide ion calculations involving pH,
concentrations and pH
pOH, [H+] and [OH-]
Real-world uses of acids and Gives examples of at least 3
bases
real world uses of both acids
and bases based on their
properties.
10
5
10
15
NAME
:
INSTRUCTIONS:
Use the resources at your table to help you
answer the questions on this worksheet.
One worksheet from your group will be
chosen at random at the end of today’s class.
Acids & Bases
1. http://chemistry.about.com/od/acidsbases/a/acidsbasesterms.htm
Visit the website above and scroll down to Properties of Acids.
Complete the following sentences for Acids






Tastes _________________
Changes litmus from blue to _____________.
Solutions are __________________________ (conduct electricity).
React with bases to form ___________________ + _______________. Neutralization
Create _______________ gas when reacting with an active metal.
List five (5) common acids (scroll down):
Properties of Bases






Tastes _____________________.
Feels _______________________________.
Changes red litmus back to __________________________.
Solutions are _____________________________ (conduct electricity).
React with acids to form ____________________ + ______________________. Neutralization
List four (4) Common Bases:
2. http://chemistry.about.com/od/acidsbases/a/phtable.htm and
http://www.visionlearning.com/library/module_viewer.php?c3=&mid=58&l
Scroll down on the site above until you get to the pH scale
Using the sites above, answer the questions below:
A. pH range of acids ______________________
B. pH of a neutral substance ______________
C. pH of a basic (alkaline) substance ______________________
Use information from the sites above and list the following substances according to pH. The lowest pH
should be listed first and the highest base listed last. HCl and NaOH are given as examples.
Substances:
Pure water
Correct Acid-Base pH list
1 HCl
Apples
Ammonia
Lime (Calcium Hydroxide)
Milk
HCl
Vinegar
Baking Soda
NaOH
Human Blood
Lemon juice
Battery Acid
Milk of Magnesia
Rain water
Egg whites
Drano
14 NaOH
INDICATORS
pg 619
1. What is an indicator?
2. Name four indicators and show how they change colors in acids and bases. (Use colored pencils,
or simply write the color change down).
3.
Explore the materials at your station. Pour the indicator into the base and into the acid. What
color change(s) do you observe? Write them down below.
When ________________________________ is poured into a base it changes color from
________________________ to ________________________.
When ________________________________ is poured into an acid it changes color from
________________________ to ________________________.
4. If you poured the indicator at your station into a solution of pH 10, what color would you expect
it to be?
5. If you poured the indicator at your station into a solution of pH 3, what color would you expect
it to be?
Calculating pH & pOH
Watch the videos at either of these websites and answer the questions that follow.
https://www.youtube.com/watch?v=UiK37I159fc&feature=youtu.be
https://www.youtube.com/watch?v=1uKtNlPLPZw
https://www.youtube.com/watch?v=95Td-csVVCo (en espanol)
1.
2.
3.
4.
[H+] and [H3O+] represent the concentration of the __________________________________ ion.
[OH-] represents the concentration / molarity of the _____________________________ ion.
To calculate pH you use the formula: -log ________________________.
Complete the table:
[H+]
Formula
pH
5. To calculate pOH you need the formula: -log ______________________.
6. Complete the table:
[OH-]
Formula
pH
7. pH + pOH = _________
8. Complete the table:
pH
2
7
9
pOH
6
3
12
Acid or base?