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WorksheetsCheMystery
Total questions: 27
Worksheet time: 14mins
Name
Class
Date
1.
What is a substance that is one color in an acid and another color in a base?
a)
Oxidizer
b)
Indicator
2.
What color does litmus paper turn in the presence of an acid?
a)
Red
b)
Blue
3.
What color does litmus paper turn in the presence of a base?
a)
Red
b)
Blue
4.
What is a solution that has an excess of H+(hydrogen) ions?
a)
pH
b)
acid
c)
neutral
d)
base
5.
What is a solution that has an excess of OH- ions?
a)
pH
b)
acid
c)
neutral
d)
base
6.
Acids are found on the pH scale between the numbers:
a)
0-7
b)
7-14
7.
Bases are found on the pH scale between the numbers:
a)
0-7
b)
7-14
8.
A solution that is ________ has a pH of 7.
a)
acid
b)
base
c)
neutral
9.
The pH scale is actually measuring the number of H+ ions in a solution. If there are a lot of H+ ions, the pH is very _______.
a)
high
b)
low
c)
neutral
d)
neither
10.
A __________ is what scientists use to measure how basic or acidic a liquid is. The _________ ranges from values very close to 0 through 14.
a)
ruler
b)
beaker
c)
pipet
d)
pH scale
11.
What color does phenolphthalein turn in the presence of an acid?
a)
pink
b)
colorless
12.
What color does phenolphthalein turn in the presence of a base?
a)
pink
b)
colorless
13.
Which solution turns phenolphthalein pink and red litmus blue?
a)
HCl
b)
CO2
c)
NaOH
14.
What color is bromothymol blue in an acidic solution?
a)
Blue
b)
Pink
c)
Yellow
d)
colorless
15.
A solution turns blue with bromthymol blue. What is the pH range?
a)
4.6 - 6.0
b)
7.6 - 8.0
16.
A solution turns blue with bromocresol green. What is the pH range?
a)
10-14
b)
1-4
c)
4.5-5.5
d)
6.8-9.8
17.
A solution turns blue with bromocresol green and yellow with bromothymol blue. The substance is _____.
a)
acidic
b)
basic
c)
neutral
18.
24 mL of NaOH makes the solution with bromothymol blue _____.
a)
colorless
b)
pink
c)
blue
d)
yellow
19.
at 26 mL of NaOH solution, the phenolphthalein turns into _____
a)
colorless
b)
pink
c)
blue
d)
yellow
20.
Which chemical indicator is best for determining the pH range of 4-6.8
a)
litmus
b)
methyl orange
c)
phenolphthalein
21.
Vinegar solution has a pH of 3.00 and sugar solution has a pH of 6.80. Which indicator can will have no change in color?
a)
litmus
b)
methyl orange
c)
phenolphthalein
22.
An acid-base indicator is mixed with an unknown solution. It changes colors from orange to yellow. The pH is measured to be 4. What would you classify this solution as?
a)
acid
b)
base
c)
neutral
23.
The mouth has a pH in the range of 6-7. If a sample of saliva were to be taken from the mouth, how would it affect the color of bromocresol green?
a)
yellow - blue
b)
blue - yellow
c)
green - blue
d)
blue - blue (no change)
24.
What is the color of methyl orange for a sample of potassium hydroxide, KOH?
a)
yellow
b)
orange
25.
A lake has a pH of 3.0, where the rates of mortality for adult fish are steadily increasing over time. How would a sample of water from this lake affect bromthymol blue?
a)
It would turn the indicator blue
b)
It would turn the indicator red
c)
It would turn the indicator yellow
d)
It would turn the indicator pink
26.
If a solution were to turn phenolphthalein pink, which of the following substances would most likely be present in this solution?
a)
NaOH
b)
HNO3
c)
HCl
27.
Which of the following indicators would be most useful to distinguish between soda, which has a pH of 2, and a sample of acid rain, which has a pH of 5?
a)
alizarin yellow
b)
phenolphthalein
c)
thymol blue
d)
methyl orange
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