Answer: B
ppm (parts per million) is a way of expressing very dilute concentrations of substances. To convert ppm to w/w% (weight/weight percent), you can use the following conversion:
1 ppm = 0.0001%
Given that you have 2000 ppm of NaOH solution, you can convert this to w/w% as follows:
\text{w/w%} = \text{ppm} \times 0.0001\%
\text{w/w%} = 2000 \times 0.0001\%
\text{w/w%} = 0.2\%
So, 2000 ppm NaOH solution by weight is equal to 0.2% w/w.
How that 1ppm = 0.0001% came
