Question

A) What is the pH of a 0.012M HNO3 solution? B)What is the pH of a...

A) What is the pH of a 0.012M HNO3 solution?

B)What is the pH of a 0.013M Mg(OH)2 solution?

HINT: What is the total concentration of hydroxide if 1 mol of magnium hydroxide yields 2 moles of hydroxide?

C) What is the pH of a 8.96 x 10-3 M HCl solution?

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Homework Answers

Answer #1

a) HNO3 is a strong acid because it dissociate completely as-

HNO3 + H2O ----> H3O+   + NO3-

pH = - log [H3O+]= - log[ 0.012] = 1.9208

C)HCl is strong acid.

HCl + H2O---> H3O+ + Cl-

pH = -log [ H3O+] = - log [8.96x10^-3] = 2.047

b) Mg(OH)2 s ----> Mg^2+ + 2 OH-

I    0.013M            0            0

C- 0.013M             0.013      2x 0.013

pOH = -log [OH-] = - log [ 0.026] = 1.585

pH = 14 - pOH = 14- 1.585 = 12. 415

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