Name: 
 

Chapter 23



Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

Which of the following is true of muriatic acid?
a.
It should never be mixed with anything other than clean drinking water.
b.
It does not harm the respiratory system.
c.
It is initially diluted at a rate of one part acid to five parts water.
d.
It is not commercially available.
 

 2. 

A solution of one part acetic acid, one part hydrogen peroxide, and six parts water is effective at removing ____.
a.
brick dust
c.
organic growth
b.
oil and tar stains
d.
manganese stains
 

 3. 

____ is a deposit of soluble salts appearing on masonry walls.
a.
Muriatic acid
c.
White scum
b.
Efflorescence
d.
Trisodium phosphate
 

 4. 

The ____ method should be used on dry walls only.
a.
bucket and brush
c.
abrasive blasting
b.
chemical saturation
d.
pressure washing
 

 5. 

According to the Brick Industry Association, brick should not be cleaned before the mortar has hardened for a minimum of ____.
a.
72 hours
c.
15 days
b.
7 days
d.
30 days
 

 6. 

____ stains are the most difficult of all to remove.
a.
White efflorescence
c.
Mud
b.
Green
d.
Smoke
 



 
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