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You can calculate it, you know. Google for the calculation methods. Vinegar is acetic acid, generally 5% by volume. Or just *do* it, and measure. Note that adding a tsp of lemon juice per quart of insufficiently-acidic tomatoes makes them acidic enough for safe waterbath canning, so clearly that sort of ratio DOES have a discernable effect on pH.
I do not know what good the calculation would do without knowing at what pH the heavy metal ions in galvanized coatings become solubilized, though.
People (generally harder to poison than chickens) have been seriously poisoned simply by drinking lemonade stored overnight in galvanized containers. Similar problems have arisen with fairly-acid natural sources of water in galvanized troughs. So it is not like you need concentrated sulfuric acid for problems to arise.
Pat