Following are pH ranges for several human biological materials. From the pH at the midpoint of each range, calculate the corresponding [H3O+]. Which materials are acidic, which are basic, and which are neutral?
(a) Milk, pH 6.6–7.6
(b) Gastric contents, pH 1.0–3.0
(c) Spinal fluid, pH 7.3–7.5
(d) Saliva, pH 6.5–7.5
(e) Urine, pH 4.8–8.4
(f) Blood plasma, pH 7.35–7.45
(g) Feces, pH 4.6–8.4
(h) Bile, pH 6.8–7.0
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