5) A 100.0 mL sample of 0.18 M HClO4 is titrated with 0.27 M LiOH. Determine the pH of the solution
a) before the addition of any LiOH.
b) after the addition of 30.0 mL of LiOH.
c) after the addition of 50.0 mL of LiOH.
d) after the addition of 66.67 mL of LiOH (this is the equivalence point).
e) after the addition of 75.0 mL of LiOH.
In: Chemistry
Please define each with credible references:
Pauli’s Exclusion Principle:
Aufbau Principle:
Hund’s Rule:
Periodic Trends
Atomic Size:
Ionization Energy:
Electron Affinity:
Metallic Character:
In: Chemistry
pH of salts
Determine if the following salts will raise, lower, or not change the pH of pure water when dissolved in the water.
a) NaCN
b) FeCl3
c) HCOOH
d) K2SO4
e) K3PO4
f) SrCl2
g) (CH3)2NH
h) Al(NO3)3
i) Li2CO3
j) KBr
k) Ca(NO3)2
l) NH4Cl
m) KBrO2
n) Zn(OH)2
o) Ba(OCl)2
p) CH3NH3Br
q) NaMnO4
r) Li2SO3
s) BaI2
t) SnBr4
In: Chemistry
What is the purpose of adding cold water in williamson ether reactions
In: Chemistry
How would you prove that a silica microsphere made by the Stobber process is actually spherical? What affect might deviations from an exact spherical shape have on crystallizing opals and their optical properties?
In: Chemistry
60.0 mL of 0.100M KOH(aq) is mixed with 40.0 mL of 0.250M HCl(aq) at 25 oC. Assuming that volumes are additive, the pH of resulting solution is
In: Chemistry
What is the pH for a 400 ml solution of 1.6 M Benzoic Acid?
If you added 75 grams of conjugate base (NaC6H5CO2) to the solution, what would the new pH be?
If you now added 75 ml of 1.35 M NaOH, what would be the new pH?
In: Chemistry
3. (15 pts) For the following calibration techniques: (a) Standard addition, (b) External calibration, and (c) Internal calibration: Draw a picture of what each graph would look like, describe each technique, and give a reason why each might be used for quantification (an advantage of each).
*just wants a general example plot, not data is provided for this problem.*
In: Chemistry
typing only...
Describe how nitrogen can be separated from the other components of air.
In: Chemistry
8H2S(g)+4O2(g)→8H2O(g)+S8(g) Δ[H2S]/Δt = -0.012 M/s
a)Find Δ[O2]/Δt.
b)Find Δ[H2O]/Δt.
c)Find Δ[S8]/Δt.
d)Find the rate of the reaction.
In: Chemistry
What are the experimental procedures for conducting a standard addition method in analytical chemistry. Why such a method is so popular in complex sample analysis? Use equations and plots and figures to explain hoy the unknown concentration is obtained from the measured data.
In: Chemistry
A student is asked to determine how many different dyes a
water-soluble food coloring contains. Which technique is best
suited to this task?
(A) paper chromatography
(B) distillation
(C) column chromatography
(D) filtration
In: Chemistry
1.00atm of H2 and 1.00atm of Br2 were mixed in a 1.00L
flask at 25°C. Under the appropriate conditions, gaseous HBr will
form. At equilibrium, 1.10×10^13 molecules of H2 were found. Given
the information below, calculate the values of K, delta G°, and
delta S°. (for this problem, you do not have available values of
free energies of formation and values of entropies of
formation.)
H2(g) + Br2(g) ----> 2HBr(g) delta H°= -103.8kJ
In: Chemistry
Discuss the results and observations of the data obtained for each acid. Specifically, discuss how the equivalence point volumes obtained from the different graphs compare to each other and to the endpoint volume determined from the indicator color change. Also, comment on why so many different means of determining the endpoint volume are necessary. Under what circumstances would one be better than another? Compare your Ka to that reported in the textbook and discuss any discrepancies
the experiment was titration of HCL and NaOH and then determining the equivalence point and the endpoint using a different method
Analysis of the Acid using Different Methods
|
Methods |
Volume at Equivalence Point |
[HCl] |
|
Titration Curve |
24.45 mL |
0.1017M |
|
First Derivative |
24.47 mL |
0.1018 M |
|
Second Derivative |
24.466 mL |
0.1018M |
|
Gran Plot |
24.40 mL |
0.1015M |
In: Chemistry
A fuel gas containing 77% methane, 7% ethane and rest propane by volume. The fuel flows to a combustion chamber at the rate of 1321 m^3/h at 15C and 150 kPA (gauge) where it is burned with 8% excess air entering at 20C. ROund your answer to the nearest whole number.
a) WHat is the propane percent in the fuel gas?
b) What is the actual number of moles of fuel flowing into the combustion chamber?
c) What is the actual number of moles of oxygen flow into the combustion chamber?
d) What is the actual number of moles of air flowing into the combustion chamber?
e) What is the ACMH?
In: Chemistry