1) For the reaction, calculate how many grams of the product
form when 24.4g of Br2 completely reacts.
Assume that there is more than enough of the other reactant.
2K(s)+Br2(l)?2KBr(s)
2)For the reaction, calculate how many grams of the product form
when 24.4g of O2 completely reacts.
Assume that there is more than enough of the other reactant.
4Cr(s)+3O2(g)?2Cr2O3(s)
In: Chemistry
Titration of Na2CO3 with HCl. You may want to record your answers in the Data Collection section of your lab manual for use during the lab. (pKa1(H2CO3) = 6.352, pKa2(H2CO3) = 10.329).
(a) What are the first and second equivalence volumes (Veq1 and Veq2) when 20.00 mL of 0.10 M Na2CO3 is titrated with 0.20 M HCl?
Veq1 = ? mL
Veq2 = ? mL
(b) What do you expect the pH to be at the following points
The first midpoint of the titration.
pH =
The first equivalence point of the titration.
pH =
The second midpoint of the titration.
pH =
(c) Calculate the pH at each of the following volumes of 0.20
M HCl added to 20.00 mL of 0.10 M
Na2CO3.
| mL 0.20 M HCl | pH |
| 0.00 | |
| 5.00 | |
| 10.00 | |
| 15.00 | |
| 20.00 | |
| 22.00 |
In: Chemistry
Inorganic;
You are attempting to synthesize some magnetic material using either Vanandium, Manganese or Cobalt and have available the ligands pyridine, I-, CO, and OH-. What complexes (oxidation states, geometeries, etc.) might you expect to make good magnetic materials?
In: Chemistry
(a) To get a feel for how ∆mixGm varies with χAB, plot it for the following values of χAB = 0, 1, 2, 3 (pick any temperature). (b) Verify that ∆mixGm obtained from the lattice model for a mixture of 2 components has a maximum or a minimum at xA = xB = 1/2 for any value of χAB. (c) Discuss how the second derivative of the free energy of mixing with respect to the mole fraction of one of the component (d2∆mixGm/dx2A) varies with χAB when xA = 1/2.
In: Chemistry
In: Chemistry
A 0.02500 g sample of the diprotic acid malonic acid (H2C3H2O4) is dissolved in water to yield a 2.00 L solution. What is the resulting pH of the solution and the concentration of malonate ion (C3H2O4^2-) at equilibruim?
In: Chemistry
consider a galvanic cell that is set up under standard conditions and allowed to react.
How many of the following responses are true?
1. Electrons are produced spontaneously at the anode electrode
2. Electrons will flow from the cathode half cell to the anode half cell
3. The mass of the cathode electrode will increase as the galvanic cell approaches being "dead"
4. The salt bridge acts as a second pathway for electrons to flow thereby "completing" the electrical circuit
5. The half reaction with the higher standard reduction potential will be found in the cathode portion of the cell Comment
In: Chemistry
Can nuclear bombs be made from reactor-grade uranium? Explain
In: Chemistry
2NO (g) + O2 (g) -> 2 NO2 (g)
if 12 moles of nitrogen monoxide are combined with 10 moles of
oxygen, how many moles of NO2 should form? I need step by step to
help with my test Please type if possible.
In: Chemistry
Calculate the molar solubility and the solubility in g/L of each salt at 25oC:
a) PbF2 Ksp = 4.0 x 10-8
b) Ag2CO3 Ksp = 8.1 x 10-12
c) Bi2S3 Ksp = 1.6 x 10-72
In: Chemistry
Balance these equations:
HCl+CaCO3=
HCl+Na2CO3=
HCl+NaOH=
NaOH+FeCl3=
CoCl2+AgNO3=
CuSO4+Na2CO3=
CuSO4+BaCl2=
Na3PO4+CuSO4=
Na3PO4+NiCl2=
Na3PO4+BaCl2=
NH4Cl+AgNO3=
In: Chemistry
Lactic acid is very good at penetrating the skin. Because of this, it is used in a number of products for skin care, such as exfoliating creams and chemical peels, and in formulations for transdermal delivery of medications, such as topical ointments and extended release patches for delivery through the skin. Lactic acid has a pKa of 3.86 in water at 25o C.
After graduation, you land your dream job at a small biotech firm specializing in novel antimicrobial agents. They have just developed a new drug, Poly-XSeption-L®, to help prevent antibiotic-resistant infections during local surgeries. Poly-XSeption-L® is to be applied to the skin at the site of the surgery in a liquid formulation containing lactic acid.
(a) The initial formulation being tested is a 1.0 wt% solution of Poly-XSeption-L® in a 0.015 M solution of aqueous lactic acid. Neglecting the effect of the antibiotic on the solution, what would you estimate the pH of this solution to be? State any assumptions you make.
(b) In clinical studies, it was found that the acidity of the initial formulation caused some problems with local irritation, and that Poly-XSeption-L® was not as effective below a pH of 4.2. It is proposed that sodium lactate be added to create a buffered solution with pH = 4.2. What concentration of sodium lactate should be used to achieve this pH?
In: Chemistry
The reaction
NO(g) + O3 -> NO2(g) + O2(g)
was studied in 2 experiments under pseudo-first order conditions.
a) [O3] = 1x1014 molecules/cc in excess
the [NO] varied as follows {Note, time is in msec (1 msec = 1x10-3 s)!}
time (msec) NO (molecules/cc)
0 6x108
100 5x108
500 2.4x108
700 1.7x108
1000 9.9x107
b) [NO] = 2x1014 molecules/cc in excess
time (msec) O3 (molecules/cc)
0 1x1010
50 8.4x109
100 7x109
200 4.9x109
300 3.4x109
a) what is the order of reaction with respect to NO?
b) what is the order of reaction with respect to O3?
c) what is the overall rate law?
d) what is the pseudo-first order rate from experiment a); what overall rate coefficient does this give? (overall rate should be in cm3 molecule-1 s-1.)
e) what is the pseudo-first order rate from experiment b); what overall rate coefficient does this give?
In: Chemistry
Use Hess's law and the measured mean enthalpy changes for the NaOH-HCl(36.2) and NH3-HCl(31.9) reactions to calculate the enthalpy change to be expected from the reaction: NaOH + NH4Cl----NaCl + NH3 +H2O
In: Chemistry
What is the pH of 0.1 M FeSO4 please show all steps
In: Chemistry