Answer to Question #140967 in Organic Chemistry for honey nifras

Question

6. Blood plasma has a pH range of 7.35 - 7.45. From the midpoint of this range calculate the following:

a) [H3O+]

b) [OH-]

c) pOH

Answer 1

pH midpoint = 7.4

a)

pH = - lg[H₃O⁺], so:

[H₃O⁺] = 10^-pH = 10^-7.4 = 4 * 10^-8 mol/L

b)

[H₃O⁺] * [OH^-] = 10^-14, so:

[OH^-] = 10^-14 / [H₃O⁺] = 2.5 * 10^-7 mol/L

c)

pOH = 14 - pH = 14 - 7.4 = 6.6