Acid-Base - Oakland Schools

Teacher Answer Key
4. pH of the Acids & Bases
Acid pH Base pH
NaOH 13-14
HCl 1-2 KOH 13-14
Ca(OH)2
NaOH
11
H2SO4 1-2 KOH
Ca(OH)2
7-11. If 6 drops of the acid are used for each titration, record how many drops of base
is needed to bring about a neutralization reaction.
Acid
(10 ml)
Base Actual
Amount of
Base Used
pH of
neutralized
solution
HCl NaOH 10 ml 7
HCl KOH 10 ml 7
HCl Ca(OH)2 100 ml 7
H2SO4 NaOH 20 ml 7
H2SO4 KOH 20 ml 7
H2SO4 Ca(OH)2 200 ml 7
If K a or K b is large, it greatly
favors the forward reaction
(ionization). If small, it favors
the reverse reaction.
Calcium hydroxide is a weak
base. Therefore, one needs a lot of
it to neutralize the strong acids.
• Write balanced chemical equations for each of the acid-base:
1 H + Cl - + 1 Na + (OH) - 1 Na + Cl - + 1 H + (OH) -
1 H + Cl - + 1 K +1 (OH) - 1 K +1 Cl - + 1 H + (OH) -
2 H + Cl - + 1 Ca +2 (OH) - 2 1 Ca +2 Cl2 - + 2 H + (OH) -
1 H + 2(SO4) -2 + 2 Na + (OH) - Na + 2(SO4) -2 + 2 H + (OH) -
1 H + 2(SO4) -2 + 2 K +1 (OH) - K + 2(SO4) -2 + 2 H + (OH) -
1 H + 2(SO4) -2 + 1 Ca +2 (OH) - 2 Ca + (SO4) -2 + 2 H + (OH) -
36