Question

Calculate the concentration of iron(III) in 2.0 M of 9 ml HCL and 0.00050 M of 1 ml FeCl3? Please help me :(

Answer 1

You need to clarify the problem.

I think you are asking to calculate (Fe^3+) which you have mixed 1 mL of 0.00050 M FeCl3 with 9 mL of 2.0 M HCl.

This is just a dilution problem. You have diluted 1 ml Of the FeCl3 with 9 mL of the HCl solution. Assuming the volumes are additive, you will hve
0.00050M x (1 mL/10 mL) = ? M FeCl3 = ? Fe^3+