A 500 g tooth-paste sample has 0.2 g fluoride concentration. What is the concentration of fluoride in terms of ppm level?

Question

A 500 g tooth-paste sample has 0.2 g fluoride concentration. What is the concentration of fluoride in terms of ppm level? (A) 250 (B) 200 (C) 400 (D) 1000

Tardigrade Admin · Accepted Answer

As 500 g of toothpaste ≡ 0.2 g of F- So 106 g of toothpaste ≡ (0.2 g × 106 g /500 g ) F - =400 g F - Hence, concentration in ppm is 400.

Q. A $500 g$ tooth-paste sample has $0.2 g$ fluoride concentration. What is the concentration of fluoride in terms of ppm level?

250

200

400

1000

As $500 g$ of toothpaste $\equiv 0.2 g$ of $F^{-}$
So $1 0^{6} g$ of toothpaste $\equiv \frac{0.2 g \times 1 0 ^{6} g}{500 g} F^{-}$
$= 400 g F^{-}$
Hence, concentration in ppm is $400$ .

Q. A 500g tooth-paste sample has 0.2g fluoride concentration. What is the concentration of fluoride in terms of ppm level?

250

200

400

1000

As 500g of toothpaste ≡0.2g of F− So 106g of toothpaste ≡500g0.2g×106g​F− =400gF− Hence, concentration in ppm is 400.

Q. A $500 g$ tooth-paste sample has $0.2 g$ fluoride concentration. What is the concentration of fluoride in terms of ppm level?

As $500 g$ of toothpaste $\equiv 0.2 g$ of $F^{-}$
So $1 0^{6} g$ of toothpaste $\equiv \frac{0.2 g \times 1 0 ^{6} g}{500 g} F^{-}$
$= 400 g F^{-}$
Hence, concentration in ppm is $400$ .