At 25 ∘C phosphoric acid, H3PO4, has the following equilibrium
constants:
H3PO4(aq)+H2O(l)H2PO4−(aq)+H2O(l)HPO42−(aq)+H2O(l)⇌⇌⇌H3O+(aq)+H2PO−4(aq)H3O+(aq)+HPO42−(aq)H3O+(aq)+PO43−(aq
What is the pH of a solution of
0.300 M K2HPO4, potassium hydrogen phosphate? Express your answer
numerically to the hundredths place.
What is the pH of a solution of 0.700 M KH2PO4,
potassium dihydrogen phosphate?
Express your answer numerically to the hundredths place.
Consider the reaction IO−4(aq)+2H2O(l)⇌H4IO−6(aq);Kc=3.5×10−2 If
you start with 25.0 mL of a 0.905 M solution of NaIO4, and then
dilute it with water to 500.0 mL, what is the concentration of
H4IO−6 at equilibrium?
Consider the reaction
IO−4(aq)+2H2O(l)⇌H4IO−6(aq);Kc=3.5×10−2IO4−(aq)+2H2O(l)⇌H4IO6−(aq);Kc=3.5×10−2
If you start with 22.0 mLmL of a 0.908 MM solution of NaIO4NaIO4,
and then dilute it with water to 500.0 mLmL, what is the
concentration of H4IO−6H4IO6− at equilibrium?
What is the equilibrium constant expression for the following
reaction:
HCN(aq) +
H2O(l)↔CN−(aq) +
H3O+(aq)
Choose from the list below and enter the letters alphabetical
order. (e.g. For an equilibrium constant of
[H3O+]-1eq[HCN]eq
enter AH.)
A) [HCN]eq
E) [HCN]-1eq
I)
[Ru(NH3)62+]6eq
B) [H2O]eq
F) [H2O]-1eq
J) [Ru2+]-6eq
C) [CN-]eq
G) [CN-]-1eq
K) [NH3]-6eq
D) [H3O+]eq
H) [H3O+]-1eq
L)
[Ru(NH3)62+]-6eq
1. Calculate [H3O+] in the following aqueous solution at 25 C:
[OH−]=1.1×10−9 M.
2. Calculate [H3O+] in the following aqueous solution at 25 C:
[OH−]=2.4×10−2 M .
3. Calculate [H3O+] in the following aqueous solution at 25 C:
[OH−]=6.2×10−12 M
then classify the solutions as acidic or basic.
[H3O^+(aq)]
Drops of Stock Solutions
Reaction Time
Test Tube
KMnO4
H2O
H3O^+/H2SO4
C2O4H2
C-1
15
25
5
5
14mins 3 sec
C-2
15
15
15
5
8mins 10sec
C-3
15
5
25
5
3mins 8 sec
a) What are the molecules and ions doing
in solution – are they static or moving around?
b) Can ions or molecules that are isolated
from one another react? What must happen for them to react?
c) Why should the permanganate disappear
faster if...
Consider the titratkon of 50.0 mL of 0.200 M
HC2H3O2 (Ka = 1.8 x
10-5) with 0.100 M NaOH.
(A.) Calculate the pH of the
HC2H3O2 before the addition of
NaOH
(B.) Calculate the pH of the solution after the addition of 20.0
mL of 0.100 M NaOH.
(C.) Calculate the pH of the solution after the addition of 50.0
mL of 0.100 M NaOH.
(D.) Calculate the pH of the solution after the addition of
100.0 mL of 0.100...