Other gases include: hydrogen sulphide (H2S), hydrogen (H2), carbon monoxide (CO), hydrogen chloride (HCl), hydrogen fluoride (HF), and helium (He), in smaller amounts.
Let’s take a look of the effect of the main gases released by the volcano. Water will not make any difference, CO2 will react with water to create a weak acid called carbonic acid.
C02(g) + H2O(aq) ->H2CO3(aq)
Sulphur dioxide is a colourless suffocating gas with a pungent odor. Its water solubility is 10 g/100 mL at 20 degrees celcius. Because it is twice as heavy as air it tends to fall to ground level.
In water sulphur dioxide will dissolve to form a weak solution of sulphurous acid.
SO2 (g) + H2O (l) ->H2SO3(aq)
It also reacts with oxygen to produce sulphur trioxide (SO3).
2 SO2 (g) + O2 (g) ->2 SO3 (g) 
This reaction is usually very slow. However, one of the mysteries during early research on air pollution was how the sulphur dioxide produced from the combustion of sulphur-containing fuels is so rapidly converted to sulphur trioxide in the atmosphere.
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