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Anonymous asked in Science & MathematicsChemistry · 2 months ago

Can carbonic acid and phosphoric acid form in solution at the same time?

So, let's say I'm running a qualitative analysis experiment and trying to determine the anions present in an unknown mixture. The possible anions in my solution could have been Cl-, I-, SO4 2-, NO3-, CO3 2-, and PO4 3- ; I was told that my unknown contained only 1 to 4 of them. The scheme I designed instructed to add 6M nitric acid if a precipitate forms after adding silver nitrate first (which it did). From here, three different things could have happened: the precipitate remains, the precipitate dissolves and bubbles ensue, or the precipitate only dissolves. When I added the nitric acid, the precipitate dissolved and bubbles ensued, signaling that carbonic acid had formed and the CO3 2- anion was present. However, is it possible that the phosphoric acid may have formed at the same time as well and I would have to test for the phosphate anion too? Or would the fact that carbonic acid formed eliminate the possibility of phosphoric acid being formed?

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