CPO Pool Water Chemistry 2

Question 1

What is the recommended pH range for swimming pool water according to CPO standards?

Accepted Answer

7.2–7.8

Answer

6.8–7.2

Answer

7.8–8.2

Answer

6.5–7.0

Question 2

Which chemical is commonly used to LOWER pH in pool water?

Accepted Answer

Muriatic acid (hydrochloric acid)

Answer

Sodium carbonate (soda ash)

Answer

Sodium bicarbonate

Answer

Calcium hypochlorite

Question 3

Total alkalinity in pool water primarily serves as a buffer against changes in:

Accepted Answer

pH

Answer

Calcium hardness

Answer

Chlorine demand

Answer

Total dissolved solids

Question 4

What is the ideal total alkalinity range for swimming pools?

Accepted Answer

80–120 ppm

Answer

40–60 ppm

Answer

150–200 ppm

Answer

200–300 ppm

Question 5

When pool pH rises above 7.8, what happens to free chlorine effectiveness?

Accepted Answer

It decreases significantly

Answer

It increases significantly

Answer

It remains unchanged

Answer

It doubles

Question 6

The Langelier Saturation Index (LSI) is used to determine:

Accepted Answer

Whether water is corrosive or scale-forming

Answer

Required chlorine dosage

Answer

Bather load capacity

Answer

Bacteria count in pool water

Question 7

Which chemical is used to raise total alkalinity without significantly raising pH?

Accepted Answer

Sodium bicarbonate

Answer

Muriatic acid

Answer

Sodium bisulfate

Answer

Calcium chloride