Calculate the pH for 0.80 M N(CH3)3, Kb=2.4x10^-7
In: Chemistry
Draw the titration curve (pH versus mL of NaOH added) that would be obtained from the titration of 30 mL of a 0.10 M solution of an unknown triprotic acid, H3A (Ka1 = 1.26 x 10–3; Ka2 = 5.6 x 10–6; Ka3 = 3.32 x 10–10) with 0.10 M NaOH. Indicate the volume needed to reach the first, second, and third equivalence points and the pH at the half equivalence points for the three titration regions.
In: Chemistry
A 1.500 Liter vessel is filled with 1.500 moles of hydrogen gas, and 2.500 mol of iodine gas to form hydrogen iodide gas at 448 oC. The reaction has an equilibrium constant of 53.5. What is the equilibrium molar concentration of all species?
In: Chemistry
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