NIC Barber Written (Theory) ExamScientific ConceptsEasy
A barber is preparing a new batch of disinfectant solution. The manufacturer's instructions state to dilute 0.5 ounces of concentrated disinfectant with 1 gallon of water. If the barber needs to make 3 gallons of solution, how much concentrated disinfectant is needed?
- A0.5 ounces
- B2.0 ounces
- C1.0 ounces
- D1.5 ounces
Show answer & explanationAnswer & explanation
Correct answer: D. 1.5 ounces
If 0.5 ounces of concentrate are needed for 1 gallon, then for 3 gallons, you would multiply 0.5 ounces by 3. This equals 1.5 ounces.
Why the other options are wrong
- A. This is the amount for 1 gallon, not 3 gallons.
- B. This would be the amount for 4 gallons (0.5 oz * 4).
- C. This would be the amount for 2 gallons (0.5 oz * 2).
Disinfectant Dilution
The process of mixing a concentrated disinfectant with a specified amount of water to achieve the correct working strength for effective decontamination.
- Always follow manufacturer's instructions.
- Incorrect dilution can reduce effectiveness or cause damage.
- Measured ratios ensure proper germicidal action.
Memory trick: Ratio Reading: Find the concentrate per unit, then multiply by total units.