No. Rain condensing from a cold cloud dissolves CO2 (I don't know how to type sub's) from the air to form as much as 1% carbonic acid (H2CO3) by volume. Falling rain only 0.03%, but a goodly total.
An excellent and sufficiently detailed description on Chemical Weathering may be found in "Principles of Geology", Gilluly, Waters and Woodford, C1975, ISBN 0-7167-0269-X, pp 215-217.

The result of this chemical action is worthy of note for some strata, as mentioned above, but some authors feel it is of little importance, given that it is strata specific. Indeed, in "Soil Mechanics in Engineering Practice", Terzaghi and Peck (excuse me while I bow three times in the direction of Harvard and U of Illinois), C1967, ISBN 0 471 85273 2, PP 10, flip it off with less than a paragraph.

Of course, the engineering text (rather, bible of practical application of soils mechanics) is not as pure as a geology text. Which is why I found geology so boring and skipped many classes to go to the tavern early. Reminds me, another brew. Gee whiz, I wish my neck was healed so I could get out and do some work. I am as bored as you Giok.

This 'mineral water'? Do you use it to mix drinks?