40 % (wt./vol.) NaCl has specific gravity 1.12 g / mL. In ppm the concentration of NaCl is:

Question

40 % (wt./vol.) NaCl has specific gravity 1.12 g / mL. In ppm the concentration of NaCl is: (A) 5.5 × 105 ppm (B) 3.57 × 106 ppm (C) 1 × 106 ppm (D) 4 × 105 ppm

Tardigrade Admin · Accepted Answer

100 mL solution =100 × 1.12 g solution =112 g solution That is, 72 g H 2 O has 40 g NaCl ∴ (40/72) × 106=5.5 × 105 ppm

Q. $40%$ (wt./vol.) $N a Cl$ has specific gravity $1.12 g / m L$ . In ppm the concentration of $N a Cl$ is:

$5.5 \times 1 0^{5} pp m$

$3.57 \times 1 0^{6} pp m$

$1 \times 1 0^{6} pp m$

$4 \times 1 0^{5} pp m$

$100 m L$ solution $= 100 \times 1.12 g$ solution $= 112 g$ solution

That is, $72 g H_{2} O$ has $40 g N a Cl$

$∴ \frac{40}{72} \times 1 0^{6} = 5.5 \times 1 0^{5} pp m$

Q. 40% (wt./vol.) NaCl has specific gravity 1.12g/mL. In ppm the concentration of NaCl is:

5.5×105ppm

3.57×106ppm

1×106ppm

4×105ppm