To make 2 mM of ferrous chloride (FeCl2), you will need to determine the molecular weight of FeCl2 and calculate the required mass of the compound based on the desired concentration. The molecular weight of FeCl2 is 126.707 g/mol, so to make 2 mM of the compound, you will need to weigh out 0.253514 g of FeCl2.
Once you have the required mass of FeCl2, you can make the solution by dissolving the compound in water. To do this, follow these steps:
It is important to note that the exact volume and pH of the final solution may vary depending on the specific conditions and requirements of the application. Therefore, it is always best to consult with a chemist or other expert to determine the appropriate concentration, volume, and pH of the solution.
On purifying ferrous chloride sol. in aq. dil. HCl from ferric iron impurities; cf. my post at: https://www.researchgate.net/post/How_can_i_dissolve_the_FeCl2_salt_in_the_aqueous_solution_while_the_ultimate_pH_be_about_31
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