When the water evaporates it does so in the form of water molecules - H2O - rather than ions. As such it is electrically and chemically neutral. In the atmosphere the water vapour molecules join to form water droplets. These can dissolve acidic anhydride species, like CO2, SO2and NO2, which make the rainwater slightly acidic, lowering the pH, not raising it.
Rain water is slightly acidic
When the water evaporates it does so in the form of water molecules - H2O - rather than ions. As such it is electrically and chemically neutral. In the atmosphere the water vapour molecules join to form water droplets. These can dissolve acidic anhydride species, like CO2, SO2and NO2, which make the rainwater slightly acidic, lowering the pH, not raising it.