“A typical vitamin C tablet contains H2C6H6O6. If two tablets are dissolved in about a cup of water, the resulting concentration of the ascorbic acid is 0.0115 M.” i gave the equation for the first ionization dissociation, and was given the Ka of 8.00x10^-5. At first I assumed .0115 was the equilibrium concentration so I solved that way, but wound up with an x that would give me a negative concentration for the second ionization, so then I solved using 0.0115 as the initial concentration, and had the same issue, getting x=9.20x10^-4. For the second ionization I’d be taking that and then subtracting the new x, which I solved as 3.9X10^-3, which again gives me a negative concentration. Please help!

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