How do acids and bases alter pH?

Question 1

How do acids and bases alter pH?

Answer 1

pH scale ranges from 0 to 14.
Acidic: pH 0-6.9 (more H⁺ ions).
Basic: pH 7.1-14 (more OH⁻ ions).
Neutral: pH 7 (equal H⁺ and OH⁻ ions).