By definition, strong acids and bases are 100% ionized in water solution. Ioniza
ID: 504056 • Letter: B
Question
By definition, strong acids and bases are 100% ionized in water solution. Ionization of a strong acid gives rise to H^+ ions, and ionization of a strong base produces OH^- ions. The equilibrium constant for a strong acid or strong base is undefined, since the reaction the ionization is complete. There is no equilibrium!. In nearly all cases of practical interest the [H^+] for a strong acid (or the [OH^-] for a strong base) is determined completely by the stoichiometry of the reaction. Once the [OH^-] or pOH is known for a base, the [H^+] or the pH of the base may be calculated using Eq(1) and/or Eq(5). Complete the following table: Calculate the pH of a 0.0430 M HNO_3 solution. pOH. [OH^-]Explanation / Answer
Recall that:
if pH < 7, acidic, pH > 7, basic, pH = 7 neutral
pH = 14-pOH
[H+] = 10^-pH
so...
a)
pH = -log(H+) = -log(5.4*10^-4) = 3.2676
pOH = 14-3.2676 = 10.7324
[OH-] = 10^-pOH = 10^-10.7324 =1.8518*10^-11
thi is acidic
b)
pOH = -log(OH) = -log(7.8*10^-10)
pOH = 9.107
pH = 14-pOH = 14-9.107 = 4.893
[H+] = 10^-4.893 = 0.00001279
this is acidic
c)
pH = 10.75
pOH = 14-10.75 = 3.25
this is basic
[H+] = 10^-10.75 =1.7782*10^-11
[OH-] = 10^-3.25 = 0.000562
d)
pOH = 5
pH = 14-5 = 9
[H+] = 10^-9
[OH-] = 10^-5
this is basic
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.