Titrations
How many milliliters of 0.150 M NaOH are needed to completely neutralize 25.0 mL of 0.200 M HCl?
M1V1 = M2V2
33.3 mL
The factor(s) from the following list that will result in an increased rate of reaction: concentration, temperature, mixing time, and physical state.
What are concentration, temperature, and physical state?
The statement that is true regarding chemical equilibrium:
- Forward rate = 0.
- Reverse rate = 0.
- Forward rate = Reverse rate
What is the forward rate = reverse rate?
The decomposition of compound A follows first-order kinetics with a half-life of 25.0 minutes.
If you start with a 0.80 M solution of A, what will the concentration be after 75.0 minutes?
0.10 M
In the following reaction, it is the substance that is reduced and its oxidation state changes from X to Y
Pb + CuCl2 --> PbCl2 + Cu
What is copper from +2 to 0?
A 25.0 mL solution of 0.100 M acetic acid (CH₃COOH) is titrated with 0.100 M NaOH.
At the equivalence point, what is the pH? (Ka for acetic acid = 1.8 x 10^(-5))
pH = 8.72
The rate law for the reaction A + 2B --> products
Given that:
A + B --> C (slow)
B + C --> products (fast)
What is rate = k[A][B]?
The equilibrium constant expression for
A2 + 2B --> 4C + 2D3.
What is Kc = [C]4[D3]2/[A2][B]2?
When given experimental data, how can you determine whether a reaction is zero-order, first-order, or second-order with respect to a reactant?
You determine the order by analyzing how the rate changes when the concentration of the reactant changes:
If [A] doubles and the rate stays the same, it’s zero order in A.
If [A] doubles and the rate doubles, it’s first order in A.
If [A] doubles and the rate quadruples (rate × 4), it’s second order in A.
The true statement is:
- Electrons flow from the cathode to the anode.
- The mass of the anode electrode increases.
- The mass of the cathode electrode increases.
- Anions from the salt bridge go to the cathode.
What is the mass of the cathode electrode increases?
In the titration of 0.100 M acetic acid with 0.100 M NaOH,
what is the pH after adding 10.0 mL of NaOH to the 25.0 mL of acid?
(Ka = 1.8×10^(-5))
pH = 4.56
According to Collision Theory, these two factors must be met for molecular collisions to result in a bond.
What are sufficient energy and orientation?
The direction that the reaction would shift if 2 moles of H2 were added
H2(g) + O2(g) --> H2O2(g)
What is to the right?
The product when Tl-205 undergoes beta decay.
20582Pb
Cu2+ + 2e- --> Cu +0.34 V
Co2+ +2e- --> Co -0.45 V
Al3+ + 3e- --> Al -1.66V
What is Al?
During a titration, a very gradual rise in pH is observed at the start, followed by a steep increase near equivalence, then leveling off again.
Which type of titration is most likely happening?
(A) Strong acid with strong base
(B) Weak acid with strong base
(C) Strong base with weak acid
(D) Weak base with weak acid
(B) Weak acid with strong base
The amount of compound that would remain after 220 seconds in the compound has a half-life of 44 seconds and there was initially 34.3 grams of the compound.
What is 1.07 grams?
The set that represents an acid/base pair:
a. H2PO4- and HPO42-
b. HPO42- and H2PO43-
c. H2PO4- and HPO32-
d. H3PO4 and Na3PO4
What is a?
The temperature above which a reaction will always be spontaneous, given that entropy decreases in the course of the reaction. (deltaH = 197.2 kJ/mol and deltaS = 610 J/mol K)
What is 323 K?
When the following half reaction is balanced in basic conditions, the hydroxide ions appear on this side and there are this number of them.
BiO3- -->Bi3+
What is 6 on the products side?
A 0.300 g sample of an antacid tablet (containing only CaCO3) is reacted with 50.00 mL of 0.1000 M HCl.
After the reaction, the excess HCl is titrated with 12.50 mL of 0.1000 M NaOH to reach the endpoint.
How many moles of HCl reacted with the tablet?
3.75 × 10⁻³ mol HCl
The concentration of a compound that would remain after 100 seconds if the decomposition follows zero order kinetics, k = 0.00563 sec-1, and the initial concentration = 2.55 M.
[At] = -kt + [Ao]
What is 1.99 M?
The pH of a 0.15 M weak acid solution with a pKa of 5.38.
What is 3.10?
The signs on deltaH and deltaS if deltaG is + at 700K and deltaG is - at 200K.
What is - for deltaH and - for delta S?
Given the following, Cu2+ will react spontaneously with this species
Zn2+ + 2e- --> Zn -0.76 V
Cu2+ + 2e- --> Cu 0.34 V
Fe3+ + e- --> Fe2+ 0.77 V
What is Zn?