A 1.000-mL aliquot of a solution containing Cu2 and Ni2 is treated with 25.00 mL of a 0.04503 M EDTA solution. The solution is then back titrated with 0.02327 M Zn2 solution at a pH of 5. A volume of 22.80 mL of the Zn2 solution was needed to reach the xylenol orange end point. A 2.000-mL aliquot of the Cu2 and Ni2 solution is fed through an ion-exchange column that retains Ni2 . The Cu2 that passed through the column is treated with 25.00 mL 0.04503 M EDTA. This solution required 21.76 mL of 0.02327 M Zn2 for back titration. The Ni2 extracted from the column was treated witn 25.00 mL of 0.04503 M EDTA. How many milliliters of 0.02327 M Zn2 is required for the back titration of the Ni2 solution?
In: Chemistry
Benzene as a saturated liquid at 5,000 mmHg is fed to a vaporizer. The product from the vaporizer is a superheat vapor at 165°C and 4,550 mmHg.
For a flow rate of 2,500 moles/min of benzene, how much is needed (kW)?
If steam is available at 500°C and 20 bar and condenses to a saturated liquid at 20 bars, how much steam (kg/hr) is needed to vaporize the benzene?
Know: ΔHv = 30.765 kJ/mol, Tb = 80.10°C, SG = 0.879, Cp (l) = 126.5 * 10^-3 + 23.4 * 10^-5 T (°C), Cp (v) = 74.06 * 10^-3 + 32.95 * 10^-5T - 25.20 * 10^-8 T^2 + 77.57*10^-12 T^3
In: Chemistry
For the following reaction, 9.88 grams of sulfur are allowed to react with 21.8 grams of carbon monoxide. sulfur (s) + carbon monoxide (g) sulfur dioxide (g) + carbon (s)
What is the maximum amount of sulfur dioxide that can be formed? (in grams)
What is the FORMULA for the limiting reagent?
What amount of the excess reagent remains after the reaction is complete? (in grams)
In: Chemistry
When 15.0 mL of a
4.89×10-4 M zinc
nitrate solution is combined with 12.0 mL
of a 6.25 ×10-4 M sodium
hydroxide solution does a precipitate
form? (yes or no)
For these conditions the Reaction Quotient, Q, is equal to
When 15.0 mL of a
7.41×10-4M potassium
carbonate solution is combined with 12.0
mL of a 4.85×10-4M copper(II)
nitrate solution does a precipitate form? (yes
or no)
For these conditions the Reaction Quotient, Q, is equal to
In: Chemistry
What do enzymes do and how do they do it (this question is intentionally vague and open ended)?
In: Chemistry
what effect does ligand exchange cause for cancer therapy?
preferably ruthenium complexes vs platinum complexes
In: Chemistry
l
2. Determine the mole fraction of zinc(II) sulfite in
a 4.22 M aqueous solution of zinc(II) sulfite. The density of the
solution is 1.01 g mL-1.
answer is not 0.0699
In: Chemistry
Formic acid (HCOOH) has Ka= 1.8x10-4. What is the pH of a 0.01 M solution of formic acid ?
PLEASE HELP I HAVE EXAM
In: Chemistry
Complete the following table
| Solution | [H3O+] | [OH-] | pOH | acidic, basic, neutral |
| Orange juice | ||||
| Milk |
1
a) Calculations for orange juice
pH= 4.5
b) calculation for milk
pH= 6.0
In: Chemistry
Explain why quantum numbers stop following the expected trend for elements at potassium, while they do follow the expected trend for ions.
In: Chemistry
Find the length and width of a square basin for virus disinfection of a flow of 5 MGD. You may assume a depth of 5 ft, a Cxt product of 20 (mg/L) min for 3-log removal, and a target free chlorine residual of 0.4 mg/L.
In: Chemistry
What is the initial pH of a titration of 25.0 mL of 0.126 M NH3 with 0.287 M HCl? Kb = 1.8 x 10-5 SHOW WORK
a. 11.18
b. 7.00
c. 2.82
d. 1.04
e. 0.54
In: Chemistry
1-Mention the uses of
acetanilide?
2-Why glacial acetic acid is used in preparation of
Acetanilide from aniline?
In: Chemistry
Discuss the relevance of of qualitative anaysis for metals in water (i.e. metals in aqeous soultions). For example, what is the usefullness of qualitative anaylysis and what use could such analyses of metal cations (or any other species) have that relates to our lives?
In: Chemistry
As with any combustion reaction, the products of combusting a hydrocarbon fuel (CxHy) with oxygen (O2) are carbon dioxide (CO2) and water (H2O).
A mass of 16.89 g for an unknown fuel was combusted in a reaction vessel containing an unknown amount of oxygen. At the end of the reaction, there still remained 16.85 g of the fuel as well as 0.0654 g of water and 0.1198 g of carbon dioxide. The oxygen was completely consumed during the reaction.
How many molecules of oxygen gas were initially present in the reaction vessel?
Express the number of molecules to three significant digits
In: Chemistry