A water sample is suspected to be contaminated by PO4 ions. How could you know if the sample is really contaminated?
回答 (2)
2017-10-06 9:52 pm
To 2 cm³ of the water sample, add a few drops of silver nitrate solution. If the water is contaminated with PO₄³⁻ ions, a yellow precipitate is formed which is re-dissolved in an excess of nitric acid.
2017-10-07 12:13 am
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