Some Basic Concepts Of Chemistry Question 44
Question: The ppm level of $ {F^{-}} $ in a 500 g sample of a tooth paste containing $ 0.2g{F^{-}} $ is
Options:
A) 400
B) 1000
C) 250
D) 200
Show Answer
Answer:
Correct Answer: A
Solution:
[a] $ ppm=\frac{wt.,of,solute}{wt.,of,solvent}\times 10^{6} $ $ =\frac{0.2}{500}\times 10^{6}=400 $
