alleryA solution with pH = 4 is:
ABasic (above pH 7)
BAcidic (10⁻⁴ M H+, well below pH 7)
CNeutral (only at exactly pH 7)
DStrongly basic (pH below 7 is basic)
Answer & Solution
Correct answer: B. Acidic (10⁻⁴ M H+, well below pH 7)
pH < 7 = acidic.
pH 4 means [H+] = 10⁻⁴ M, more acidic than water.
**Common examples:** lemon (pH 2), vinegar (3), tomato (4), milk (6.5).
Acidic solutions turn blue litmus red.
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