Question

AMot of Lleol: L00xLD6 =L06 0.063 88 ppm 18 ppm d. Casa o.oooL693 LOG a. 880 ppm 180 ppm e 170 ppm b. Lead is the least toxic to fish compared to zinc, copper, and mercury ions. Fish can tolerate a concentration slightly above 0.85 mM. What is the lead concentration in mg/L? louom 207-20 a 1000 m 0.85 motes

Answer 1

Let volume be 1 L

volume , V = 1 L

Given:

M. =0.85 mM = 8.5*10^-4 M

use:

number of mol,

n = Molarity * Volume

= 8.5*10^-4*1

= 8.5*10^-4 mol

Molar mass of Pb = 207.2 g/mol

use:

mass of Pb,

m = number of mol * molar mass

= 8.5*10^-4 mol * 2.072*10^2 g/mol

= 0.1761 g

So,

Concentration = 0.1761 g/L

Concentration = 176.1 mg/L

Answer: 1.8*10^2 mg/L