CPO Chemical Handling and Storage 3

Question 1

When diluting muriatic acid (hydrochloric acid) for pool use, the correct procedure is to:

Accepted Answer

Add the acid slowly to water—never the reverse

Answer

Always add acid to water because the heat generated is absorbed by the larger volume of water; reversing this can cause violent spattering.

Question 2

Cyanuric acid (CYA) is added to outdoor pools primarily to:

Accepted Answer

Stabilize free chlorine against UV degradation from sunlight

Answer

CYA (stabilizer/conditioner) forms a reversible bond with free chlorine, shielding it from ultraviolet light and extending its useful life.

Question 3

Sodium bicarbonate is used in pool water management to:

Accepted Answer

Raise total alkalinity with minimal impact on pH

Answer

Sodium bicarbonate primarily increases total alkalinity and has only a minor elevating effect on pH, making it the preferred alkalinity increaser.

Question 4

When multiple chemical adjustments are needed, the correct approach is to:

Accepted Answer

Add each chemical separately, allowing full distribution before adding the next

Answer

Adding chemicals one at a time and waiting for full distribution prevents dangerous in-water reactions between incompatible chemicals.

Question 5

Chemical storage rooms should have adequate ventilation primarily to:

Accepted Answer

Prevent the accumulation of toxic or flammable chemical vapors

Answer

Proper ventilation dilutes and removes vapors that can accumulate to toxic or flammable concentrations, protecting workers and reducing fire risk.

CPO (Certified Pool Operator Exam) Practice Test