What is the concentration of lead in an unknown solution, Chemistry

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What is the concentration of lead in an unknown solution

The limiting current of lead in an unknown solutions is 5.60μA. one mL of a 1.00 x 10-3M lead solution is added to 10.0mL of the unknown solution and the limiting current of the lead is increased to 12.2μA.What is the concentration of lead in an unknown solution.

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