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The reason it will not read a pH of 7 stems from the fact that WITHOUT A BUFFER, distilled water will interact with the air/environment and thus you will experience wild fluctuations in pH. Incidentally, distilled or deionized water with a buffer is what we use to calibrate our pH meters. Hydronium and hydroxide ions are complete opposites of each other. The more hydroxide ions present the more basic the solution. The more hydronium ions present, the more acidic the solution. I don't know what the true purpose of your post is, barring academic banter. The interactions within the water jackets of our vehicles are fairly complex. With assorted metals, gasket materials, and high heat it would be very difficult to come up with a perfectly prepared pure water that could respond to all of this without a fluctuating pH. The use of a buffer is the only way to maintain a particular pH in this environment. I am a biologist, not a chemist, so this is a matter of conjecture, but I would assume that antifreeze may very well act as a buffer. Carry on.
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