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?
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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