To determine the concentration of Pb+2 ion in the given solution, we need to divide the amount of Pb+2 ion by the volume of the solution:
Concentration = amount of Pb+2 ion / volume of solution
First, we need to convert the given mass of Pb+2 ion to moles, using the molar mass of Pb+2:
molar mass of Pb+2 = 207.2 g/mol
moles of Pb+2 = 0.0430 g / 207.2 g/mol = 0.0002076 mol
Next, we can plug in the values into the formula:
Concentration = 0.0002076 mol / 0.100 L = 0.00208 M
To follow significant figure rules, the concentration should be rounded to 3 significant figures, since the least precise value (0.100 L) has 1 significant figure:
Concentration = 0.00208 M (rounded to 3 significant figures)