Question

a 500g toothpaste sample has 0.2g fluoride cocentration what is conc. of floride in terms of ppm level?

Answer 1

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12th

Chemistry

Solutions

Expressing Concentration of Solutions

A 500 g tooth paste sample ...

CHEMISTRY

A 500g tooth paste sample has 0.02gm fluoride concentration. What is the concentration of fluorine in terms of ppm levels?

A

250

B

40

C

400

D

1000

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ANSWER

Given, 

500 g tooth paste ⇒0.02 gm flouride

ppm→ Parts per million.

So, for a million gram toothpaste.

500−0.02

1000000−(x)ppm

⟹500×x=0.02×1000000

⟹x=5200

Flourine in ppm =40 ppm

Hence, the correct option is C