Question

Concentration of 0.01 % is equivalent to how many parts per million (ppm)?

• A. 10 ppm
• B. 1 ppm
• C. 1000 ppm
• D. 100 ppm

Hint:

Always remember this simple conversion factor:
\(1\% = 10,000\text{ ppm}\)
Therefore, simply move the decimal point four places to the right to convert from percent to ppm.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
In water quality and toxicology, chemical concentrations are represented as percentages or as parts per million (ppm).
Converting between these units is vital for accurate dose calculations.

Step 2: Key Formula or Approach:
One percent (\(1\%\)) means 1 part in 100 parts.
Parts per million (ppm) means 1 part in 1,000,000 parts.
To convert percentage to ppm:
\[ \text{Value in ppm} = \text{Percentage value} \times 10,000 \]

Step 3: Detailed Explanation:
Given concentration = \(0.01\%\)
Applying the conversion:
\[ \text{Concentration in ppm} = 0.01 \times 10,000 = 100\text{ ppm} \]

Step 4: Final Answer:
A concentration of 0.01% is equivalent to 100 ppm, which is option (D).