I'm no chemE but I associate alkaline w/ basic pH. I associate alkalinity w/ something else of more relevance (carbonate content primarily). Water droplets are pure as they condense in atmosphere to form rain (ph7). They are in equilibrium w/ carbonate before they hit ground (ph 6.3). That's why pristine waters are all slightly acidic; pH 6.3 or so from hco3-. I know that my barnstead water purification system (18.2 Mohm deionized distilled water free of particulates, pyrogens, dnase/rnase, and all other contaminants) has same EC as our house distilled water (ro 16Mohm or so) if you pour them both out into beaker and measure. Can't fight henry's law...
but i'm no cheme
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