What is the pH of a 5.6 times 10^-5 M LiOH solution? (b) What is the H_3O^+ conc

Question

What is the pH of a 5.6 times 10^-5 M LiOH solution? (b) What is the H_3O^+ concentration of the solution? M (c) What is the pOH of the solution? (a) What is the pH of a 2.8 times 10^-4 M Sr(OH)_2 solution? (b) What is the H_3O^+ concentration of the solution? M (c) What is the pOH of the solution? Is an aqueous solution of Na_3PO_4 acidic, basic, or neutral? What is the formula and charge of the ion(s) responsible for the solution being acidic or basic? Type your answer using the format Na1 + for Na^1+ or SO42- for SO_4^2-. Keep the elements in the order given. If neither of the ions affect the acidity or basicity of the solution, enter 'none'.

Explanation / Answer

Formulas used,

pH + pOH = 14

[H+][OH-] = 1 x 10^-14

pH = -log[H3O+]

pOH = -log[OH-]

(1) for HNO3

(a) pH of 7.7 x 10^-3 M HNO3 = -log[H+1=] = -log(7.7 x 10^-3) = 2.11

(b) [OH-] = 1.29 x 10^-12 M

(c) pOH = 14 - pH = 11.89

(2) For LiOH

(a) pH = 9.748

(b) [H3O+] = 1.78 x 10^-10 M

(c) pOH = -log[OH-] = -log(5.6 x 10^-5) = 4.252

(3) For Sr(OH)2

(a) pH = 14 - pOH = 10.748

(b) [H3O+] =1.786 x 10^-11 M

(c) pOH = -log[OH-] = -log(2 x 2.8 x 10^-4) =3.252

(4) An squeous solution of Na3PO4 is basic

The formula for the ion responsible for the solution being basic is, PO4^3-

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