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Identify Acids and Bases

Total questions: 25

Worksheet time: 17mins

Name
Class
Date
1.

Which of the following formulas below are acids? ( Select ALL that apply)

a)

H2SO4

b)

HCl

c)

NaOH

d)

CaCO3

2.
Carrie's teacher hands out test tubes filled with different chemicals and tells the students to identify their liquid as an acid, base, or neutral chemical. Carrie's test tube contains a clear chemical. She adds phenolpthalein to her test tube and gently moves the tube from side to side. A few moments later, the chemical in the test tube turns bright pink.
What type of chemical does Carrie have?
a)
Carrie has a neutral chemical.
b)
Carrie has an acidic chemical.
c)
Carrie has a basic chemical.
d)
The type of chemical Carrie has cannot be determined.
3.

Which of the following word pairs correctly completes the sentence below?

_______ are corrosive substances characterized as having a strong smell, a sour taste, and a _______.

a)

Acids; pH less than 7

b)

Acids; pH greater than 7

c)

Bases; pH greater than 7

d)

Bases; pH less than 7

4.

If an acid is combined with a base of equal strength, the result will most likely be

a)

strong base

b)

a stronger acid.

c)

impossible to tell without testing the pH.

d)

a neutral solution.

5.

When bases are added to water, what kind of ions are produced?

a)

H+

b)

OH-

c)

A-

d)

B+

6.
Many cleaning solutions are bases. Which of the following is a property of most bases?
a)
feels slippery
b)
white color
c)
can only be liquid
d)
tastes sour
7.
 Which of the following is an acid?
a)
shampoo
b)
baking soda
c)
orange juice
d)
water
8.

Of the following which is NOT a pH indicator?

a)

Phenol Red

b)

Cabbage Juice

c)

Phenolphtalein

d)

Phenol Purple

9.
The pH of a solution is tested, and it is found to be a basic solution. Of the following choices, what could the pH have been?
a)
3
b)
9
c)
7
d)
5
10.
Pure water has a pH of 7. Pure water _______.
a)
is a base
b)
is a neutral substance
c)
could be either an acid or a base
d)
is an acid
11.

Which of the following is a basic solution?

a)

Household ammonia

b)

HCl dissolved in water

c)

Vinegar

d)

Pure water

12.
Which of the following statements is correct?
a)
Blue litmus paper turns red when placed in a base.
b)
Red litmus paper turns blue when placed in a base.
c)
Blue litmus paper stays blue when placed in an acid.
d)
Red litmus paper stays red when placed in a base.
13.

Which of the following chemical formulas can be identified as an Acid?

a)

NHCL

b)

HNO3

c)

NaOH

d)

Na2SO4

14.

An acid has a pH...

a)

from 0 to 6

b)

from 8 to 14

c)

from 5 to 10

d)

between 6 & 7

15.

Tammy wanted to test the pH of a liquid solution. She added three drops of Phenol Red to solution, after a few moments she noticed a bright yellowish cooler. What is most likely the pH of the solution?

a)

6.8 or below

b)

8.2 and above

c)

Neutral

d)

None of these because I do not have enough information.

16.

All acids form ions when dissolved in water. Which ion makes the solution acidic?

a)

H+

b)

OH-

c)

A-

d)

B+

17.

What methods can you use to measure the pH of a solution?

a)

Observing color or clarity

b)

Measuring mass or volume

c)

Measuring density or electrical conductivity

d)

Using acid base-indicators or pH meters

e)

By tasting it

18.

James spilled some HCl on the floor. What would be the best way for James to clean the floor?

a)

Call 911

b)

Clean it with water

c)

Neutralize it with a Strong base

d)

Neutralize it with a Strong Acid

e)

None of these, because I don't know if HCl is an acid or base

19.

Of the following formulas which is a base?

a)

HBr

b)

Mg(OH)2

c)

KCl

d)

CaCl2

20.
The pH of vinegar is 2.5.  Vinegar is a _____________.
a)
strong acid
b)
strong base
c)
weak base
d)
weak acid
21.
Williams collected a rain sample and measured its pH to be 5.6.  What does this mean?
a)
the rain water is a weak base
b)
the rain water is neutral
c)
the rain water is a strong acid
d)
the rain water is a weak acid
22.

Litmus paper can tell you if a solution is acidic, neutral or basic by changing color when placed in a solution. If you test a acid with litmus paper, it will turn ____________.

a)

purple

b)

red

c)

blue

d)

pink

23.
Which of these pH values would indicate that a solution is a weak base?
a)
4
b)
5.6
c)
8
d)
13
24.

Which of the following are salt solutions? ( Select ALL that apply)

a)

NH4Cl

b)

H2CO3

c)

FeBr3

d)

Al(NO3)3

e)

KOH

25.

Which of the following word combinations correctly completes the sentence below?


If a the chemical formula does not a have a ________ at the end or a __________ at the beginning it must be a __________solution.

a)

H; OH; Acidic

b)

OH; H; Basic

c)

Acidic; OH; Salt

d)

OH; H; Salt

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