Using The 0 To 14 Ph Indicator Paper Strip (Page 2 of 2) in pdf

Using The 0 To 14 Ph Indicator Paper Strip Page 2

Name _______________________________________Date_________________Period_____________

Using the 4.5 to 7.5 pH Indicator Paper Strip

In this activity, you will use a narrow range pH test paper strip to find pH values for some of the

substances in the Gizmo.

1. First, make a copy of the table below to collect your pH data from this experiment. You can either

print this table out, or remake it yourself.

2. Before you begin testing, fill in the pH value (0-14 paper) column with the pH values you found in

the previous experiment.

3. In the Gizmo, under pH indicator paper strip type, choose 4.5-7.5 paper. (With this paper, you can

test pH with a precision of 0.5 rather than 1.) Then, under Substances in the Tube, choose Beer.

Click Test.

1. According to the 4.5-7.5 paper, what is the pH value of beer? Record this value in the pH

value (4.5-7.5 paper) column.

2. How does this value compare to the pH value you found using the 0-14 paper?

4. Repeat step 3 of this activity for the substances listed in the data table. (You do NOT need to test

all the substances in the Gizmo.) Record your results in the table.

5. Answer the questions below, comparing results from the 0-14 paper and from the 4.5-7.5 paper.

1. For substances with a pH value that measured between 4.5 and 7.5 on the 0-14 paper, how

did the pH value from the 4.5-7.5 paper compare to the pH value from the 0-14 paper?

2. What advantage do you see to using the 4.5-7.5 paper to measure pH?

3. Which substances in the second data table have pH values that fall OUTSIDE the 4.5-7.5

range? What are their pH values from the 0-14 paper?

4. When you tested a substance with a pH value of less than 4.5, what reading did you get

from the 4.5-7.5 paper?

5. When you tested a substance with a pH value of greater than 7.5, what reading did you get

from the 4.5-7.5 paper?

6. What disadvantage do you see to using the 4.5-7.5 paper to measure pH?

6. After using two different types of pH indicator paper, which substance appears to be neutral (pH

7)?

Using The 0 To 14 Ph Indicator Paper Strip Page 2