Verified Answer :

Final answer:

Milk is the only substance among those listed that has a slightly acidic pH, making it the substance with the lowest [H] concentration while still being considered an acid. Other substances listed are either strongly acidic (gastric fluid) or neutral/basic (blood, household lye). Therefore, milk qualifies as the correct answer due to its pH level.


Explanation:

Understanding Acidic and Basic Solutions


To determine which substance has the lowest [H] concentration but is still considered an acid, we need to consider the pH values of the substances listed.



  • Gastric fluid: Typically has a pH of around 1-3, indicating a high concentration of [H].

  • Milk: Has a neutral to slightly acidic pH of about 6-7.

  • Blood: Is slightly basic with a pH around 7.4.

  • Household lye: This is a strong base with a very high pH of around 13.


Among the four substances given, gastric fluid is the strongest acid, while household lye is a strong base. Therefore, while both milk and blood appear to be neutral or slightly acidic/basic, milk is the only substance listed that is technically below pH 7 and still can be categorized within a broader range of acidic substances. Thus, we conclude that:



  • Milk: Has the lowest [H] concentration among the materials you provided, while still being mildly acidic.


Learn more about Acid-Base Chemistry here:

https://brainly.com/question/32965624


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