Module 7/11
In a titration experiment, what is the difference between the analyte and the titrant?
A. The analyte is always an acid, the titrant is always a base.
B. The analyte is whats already in the flask while the titrant is what is being added to the flask.
C. The titrant is whats already in the flask while the analyte is what is being added to the flask.
D. The Volume of analyte (initial [ ]) is added to a set volume of the titrant (unknown initial [ ])
B. The analyte is whats already in the flask while the titrant is what is being added to the flask.
Identify the balanced chemical equation which corresponds to the following equilibrium constant expression
Kp = PNH3/ PN2^1/2 PH2^3/2
A)1/2 H2(g) + 3/2 N2(g) = NH3(g)
B)1/3 N2(g) + 2/3 H2(g) = NH3(g)
C)2 NH3 (g) = N2(g) + 3 H2(g)
D)NH3 (g) = 1/2 N2(g) + 3/2 H2(g)
E)1/2 N2(g) + 3/2 H2(g) = NH3(g)
E. 1/2 N2(g) + 3/2 H2(g) = NH3(g)
If pH = 9.33, [OH^-] = ?
A. 10^(14-9.33)
B. 10^-(-14-9.33)
C. 10^-(14-9.33)
D. 10^-9.33
E. 10^-(-7-9.33)
C. 10^-(14-9.33)
Write the Henderson Hasselbalch equations to find pH and pOH.
pH = pKa + log [conj base] / [acid]
pOH = pKb +log [conj acid] / [base]
What do I want to be when I am older?
Psychiatrist
A second-order reaction has a rate constant of 2.5x10^-3 s^-1
What is the half-life of the reaction if our initial concentration is 2.8 M?
What is the half life if our concentration is 1.6 M instead?
142.8s and 250s
Determine which direction the reaction will shift in for each case. Na2CO3(s)=2Na+(aq)+CO32-(aq)
1. No Shift
2. Shift Right
3. Shift Left
6. What is the hydroxide ion concentration in a 0.12 M barium hydroxide solution, and what is the pOH?
[OH^-] = 0.24M
pOH = 0.620
Determine if the salt solutions will have a pH below, near, or above seven when dissolved in water.
1) Na2SO3
2) NH4NO3
1) Basic = pH Above 7
2) Acidic = pH Below 7
Which planet in the Milky Way is the hottest?
Venus
Activation energy is the minimum energy required to
A. Break the chemical bonds and free atoms to form new bonds
B. Stop a chemical reaction
C. Form chemical bonds in the products of a reaction
D. Force a chemical reaction to complication
E. Slow down atoms in a compound
A. Break the chemical bonds and free atoms to form new bonds
For the following reaction at equilibrium, which choice gives a change that will shift the position of equilibrium to favor formation of more products?
2NOBrg) = 2NO(g) + Br2(g)
Delta H°rxn = 30 kJ/mol
A. Add more NO
B. Remove Br2
C. Lower the temperature
D. Remove NOBr selectively
E. Increase the total pressure by decreasing the volume.
B. Remove Br2
List the name and formula of all the strong acids.
HCl-Hydrochloric Acid
HBr-Hydrobromic Acid
HI-Hydroiodic Acid
HNO3-Nitric Acid
HClO3-Chloric Acid
HClO4-Perchloric Acid
H2SO4-Sulfuric Acid
Find the pOH of a solution that has 0.033 mol of HPO4^2- and 0.067 mol of H2PO4^-.
The pKa of H2PO4^- is 7.2. Assume this is a 1 L solution.
pOH = 7.11
How many elements are on the periodic table?
118
The decomposition of formic acid follows first order kinetics. HCO2H(g) = CO2(g) + H2(g)
The half-life for the reaction at 550 C is 24 seconds. How many seconds does it take for the formic acid concentration to decrease from 0.800M to 0.200M at this temperature?
48 Seconds
Write the Kc and Kp Expression for the reaction.
C3H8(g) + O2(g) = CO2(g) + H2O(g)
Kc = [CO2]^3 [H2O]^4 / [C3H8] [H2O]^5
Kp = [P CO2]^3 [P H2O]^4 / [P C3H8] [P H2O]^5
What is the pOH of a 0.20 M hypochlorous acid (HClO) solution? (the Ka for HClO = 3.0×10^-8)
pOH = 9.89
The Ka values for pyridinium (C5H5NH^+), methylammonium (CH3NH3^+), hydrogen cyanide (HCN), and acetic acid (CH3COOH) are 5.9×10^-6, 2.3x10^-11, 4.9×10^-10, and 1.81x10^-5 respectively. According to these values, which one of these acids will have the strongest conjugate base?
A)Pyridinium
B)Methylammonium
C)Hydrogen cyanide
D)Acetic acid
E)The question cannot be answered
B) Methylammonium
What is my favorite coffee place?
DUTCH BROS (GOLDEN EAGLE WITH SWEET CREAM FOAM)
A 150 mL solution of nitrous acid (Ka= 4.5 x 10-4) is titrated with a solution of 2.00 M KOH. The equivalence point is reached when 86.0 mL of the base has been added.
Determine the pH of the solution during the titration when 43.0 mL of base had been added.
A) pH = 2.55
B) pH = 3.35
C) pH = 4.54
D) pH = 5.25
E) None of these
pH = 3.35
On analysis, an equilibrium mixture for the reaction 2H2S(g) = 2H2(g) + S2(g) was found to contain 2.0 mol H2S, 3.0 mol H2, and 1 mol S2 in a 3.0 L vessel. Calculate the equilibrium constant, Kc, for this reaction.
A) 0.49
B) 2.25
C) 1.5
D) 0.75
E) None of the Above
D) 0.75
Find the pH and pOH of a 0.35 M sodium formate (NaHCOO) solution. The pKa for its conjugate acid, formic acid (HCOOH, is 3.75. Calculate the Kb for the formate ion (HCOO-).
pOH = 5.35
pH = 8.65
Kb = 5.6x10^-11
For phosphoric acid, Ka1 = 7.3x10^-3, Ka2 = 6.2x10^-5, and Ka3 = 4.8x10^-13. Which of the following represent the conjugate acid-base pair pertaining to Ka2?
А) Н2РОз (aq) / НРО3^- (aq)
B) H2PO4 / HPO4^2- (aq)
C) HPO4^2- / PO4^3-
D) H3P04 /H2P04
E) None of these
B) H2PO4 / HPO4^2- (aq)
Name everyone in this workshop
Everyones Name