9.2 pH

Less than 7: acidic

7: neutral

more than 7: basic or alkaline

Physiological pH: 7.35-7.45

Acidosis: below 7.35

Alkalosis: above 7.45

Acidosis & Alkalosis: life-threatening

Acid-base homeostasis: proper pH maintenance of 7.35-7.45

Amphoteric: can be a base or an acid.

Ion-product constant for water: Kw 1.0 × 10^-14 = hydronium ion concentration & hydroxide ion concentration in aq solution at 25 C: Kw = H3O+ x OH-.