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What is the chemical equation for diphosphorus trioxide + water ---> phosphorous acid?
Diphosphorus trioxide + water produces phosphorous acid.
Diphosphorous trioxide is a molecular (covalent) compound. Using the prefixes the molecular formula is ##P_2O_3##
Phosphorous acid is ##H_3PO_3##
##P_2O_3 + H_2O -> H_3PO_3##
To balance this equation we begin be adding a coefficient of 2 in front of the phosphorous acid.
##P_2O_3 + H_2O -> 2H_3PO_3##
We balance the hydrogen by adding a coefficient of 3 in front of the water.
##P_2O_3 + 3H_2O -> 2H_3PO_3##
I hope this was helpful. SMARTERTEACHER