Dear Nirmal,
The selenious acid or "monohydrated selenium dioxide" is formed upon the addition of selenium dioxide to water:
SeO2(s) + H2O(l) → H2SeO3(aq)
SeO2 + H2O → H2SeO3(aq) -it is right !
SeO2 is hygroscopic, readily soluble in water!
To all previous ones: Mr. Selvaraj asked about a detailed description of the acid sythesis.
SeO2 (110.96) + H2O (18.02) → H2SeO3 (128.98)
The preparation technique as follows: dissolve SeO2 in little amount of water (in porcelain mortar), thereupon the evaporation of the solution follows. NB: this solution found in a mortar must be avoided ingressing of dust in the course of the evaporation.
The evaporation is carried out on the bain-marie until the crystallization occurs.
After cooling H2SeO3 formed has to be filtered using a glass filter and recrystallized in water once again to provide an appropriate purity of the product.
The recrystallized H2SeO3 has to be dried in filter paper accurately wringing out the residual water.
Keep the acid in a vacuum exsiccator over KOH during a three-four days time (NOT MORE, because distinct dehydration of the acid will take place).
Your welcome!
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