Arsenic acid is prepared by treating arsenic trioxide with concentrated nitric acid.
- As2O3 + 2 HNO3 + 3 H2O → 2 H3AsO4(H2O)0.5 + N2O3
The resulting solution is cooled to give colourless crystals of H3AsO4(H2O)0.5. When the crystallisation is conducted at lower temperatures, the dihydrate crystallises.
Read more about this topic: Arsenates
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