what is the pH of a solution that mixes 30.00 mL of 0.010 M Ch3oh with 30.00 mL 0.00750 M Nach3co2?
In: Chemistry
The triple point of ammonia is at 196.2 K and 49.42 torr. The
molar enthalpy change of vaporization is equal to 24.65 kJ
mol-1 at this temperature.
a. Find the normal boiling temperature of ammonia.
b. The actual boiling temperature is -33 ̊C. Find the average value
of the molar enthalpy change of vaporization for the range between
the triple point and the normal boiling temperature.
In: Chemistry
1. Which of the following alkyl halides would not be suitable to make a Wittig reagent
1-bromo-2-methylpropane
2-bromobutane
2-bromo-2-methylpropane
(Bromomethyl)cyclopentane
In: Chemistry
In: Chemistry
a) What is the pH of a buffer solution prepared by mixing 120 mL of a 0.435 M CH3CO2H with 50 mL of a .286 M CH3CO2Na solution? CH3CO2H Ka = 1.75 x 10-5
b) What is the resulting pH if we add 10.2 mL of a .513 M HCl solution to this buffer? Does the pH make sense? Why/why not?
c) What is the resulting pH if we add 3.56 mL of a 0.420 M NaOH solution to the original buffer?
In: Chemistry
Calculate the pH at 25 C of a 0.75 M aqueous solution of phosphoric acid (H3PO4). (Ka1, Ka2, and Ka3 for phosphoric acid are 7.5*10-3, 6.25*10-8, and 4.8*10-13, respectively.)
In: Chemistry
In: Chemistry
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± Introduction to Solubility and the Solubility Product Constant Learning Goal: To learn how to calculate the solubility from Kspand vice versa. Consider the following equilibrium between a solid salt and its dissolved form (ions) in a saturated solution:CaF2(s)⇌Ca2+(aq)+2F−(aq) At equilibrium, the ion concentrations remain constant because the rate of dissolution of solid CaF2 equals the rate of the ion crystallization. The equilibrium constant for the dissolution reaction isKsp=[Ca2+][F−]2 Ksp is called the solubility product and can be determined experimentally by measuring thesolubility, which is the amount of compound that dissolves per unit volume of saturated solution. |
Part A A saturated solution of lead(II) chloride, PbCl2, was prepared by dissolving solid PbCl2 in water. The concentration of Pb2+ ion in the solution was found to be 1.62×10−2M . Calculate Ksp for PbCl2. Express your answer numerically.
SubmitHintsMy AnswersGive UpReview Part Part B The value of Ksp for silver sulfide, Ag2S, is 8.00×10−51. Calculate the solubility of Ag2S in grams per liter. Express your answer numerically in grams per liter. |
In: Chemistry
1. On page 410 in your Brown & Foote textbook, the following reaction is shown.
3-pentanol + HBr --heat--> 3-bromo-pentane (major product) + 4-bromo-pentane (minor product)
a. Explain how the minor product can form in this reaction and what does it tell us about the mechanism by which the reaction proceeded.
b. Is there any basis in reality to the books claim regarding this reaction? Perform a literature search to see if indeed any chemist reported such results. If you do find such a paper, give the full citation of the paper.
2. Part of the procedure this week calls for a reflux which has a water cooled condenser open on the top to the atmosphere. Why would it be a bad idea to stopper or cap the apparatus? Explain what would happen if the apparatus was capped?
In: Chemistry
A 1.00 mL ampule of a 0.150 M solution of naphthalene in hexane is excited with a flash of light. The naphthalene emits 12.5 J of energy at an average wavelength of 349 nm. What percentage of the naphthalene molecules emitted a photon?
In: Chemistry
In: Chemistry
Phosphoric acid is a triprotic acid with the following pKa values:
pKa1=2.148 pKa2=7.198 pKa3=12.375
You wish to prepare 1.000 L of a 0.0200 M phosphate buffer at pH 7.720. To do this, you choose to mix the two salt forms involved in the second ionization, NaH2PO4 and Na2HPO4, in a 1.000 L volumetric flask and add water to the mark. What mass of each salt will you add to the mixture?
mass NaH2PO4= ________g mass Na2HPO4= __________g
What other combination of phosphoric acid and/or its salts could be mixed to prepare this buffer? (Check all that apply).
H3PO4 and NaH2PO4
H3PO4 AND Na2HPO4
H3PO4 and Na3PO4
NaH2PO4 and Na3PO4
Na2HPO4 and Na3PO4
In: Chemistry
Answer the following questions:
In: Chemistry
Balance the following equation in acidic solution using the lowest possible integers and give the coefficient of H+. MnO4-(aq) + H2S(g) → Mn2+(aq) + HSO4-(aq)
In: Chemistry
When an optical spectroscopic transition is measured, either by emission or absorption, a so-called lineshape of given intensity and frequency dependence is obtained. For any spectroscopy there exist quantum mechanical or other basic connections to all of the experimental parameters that determine the lineshape. List these experimental parameters and explain how they are related to the previously mentioned connections.
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