college chemistry

An aspirin tablet weighing 0.502 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved
the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL
of the solution was pipetted into a 100 mL volumetric flask and diluted to the mark with FeCl_3 solution.
The concentration of the diluted solution is

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  1. 2.00g of NaOH are dissolved in water to make 5.00L of solution. What is the concentration of hydronium ions, [H3O+], in this solution?

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