A stock solution containing Mn²+ ions was prepared by dissolving 1.861 g pure manganese metal in nitric acid and diluting to a

Question

A stock solution containing Mn²+ ions was prepared by dissolving 1.861 g pure manganese metal in nitric acid and diluting to a final volume of 1.000 L. The following solutions were then prepared by dilution:
For solution 4, 40.00 mL of stock solution was diluted to 1000.0 mL.
For solution B, 20.00 mL of solution A was diluted to 250.0 mL.
For solution C, 10.00 mL of solution B was diluted to 550.0 mL.
Calculate the concentration of the stock solution.

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