Question

a bottle was filled with 81 ml of a solution that contained 63 ppb of lead. lashawndra accidentally poured some water into the bottle. she measured the volume of the resulting solution and found it to be 108 ml. what is the concentration of lead in the diluted solution?

Answer 1

The concentration on lead will be 47.25 × 10⁻³ g/L

What is molarity?

Molarity also known as molar concentration refers to the number of moles of solute per liter of solution. The formula for molarity is: M = n /v.

According to the given question:

M₁ = $\frac{n}{V_{1} }$

V₁ = 81 ml or 81 × 10⁻³ ( volume of solution)

M₁ = 63 × 10 ⁻⁶

Since, M₁V₁ = M₂V₂

=  63 × 10⁻⁶ × 81 × 10⁻³ = M₂ × 108 × 10⁻³

M₂ = 47.25 × 10⁻³

Hence, the molar concentration of lead for the new volume will change to 47.25 × 10⁻³ g/L

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