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I think the correct answer among the choices listed is the third option. Gastric fluid is the substance that has the lowest [H+] concentration but is still considered an acid. This fluid is also called gastric acid or stomach acid. It is formed in the stomach and is composed of hydrochloric acid having a concentration of 0.05 - 0.1 M.
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Answer:

milk

Explanation:

Gastric fluid is highly acidic with a pH of 1.5 -3.5 and very high [H⁺]. Milk has a pH of 6.5-6.7, so it has the lowest [H⁺]. Milk is only slightly acidic, it is very close to neutral pH of 7.0. Milk has lactic acid, which is a weak acid. Blood is neutral with pH of around 7.0,  household lye is alkaline with a pH of 13.5. the higher the pH the lower the [H⁺] and vice versa.

pH = - log [H⁺]

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