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What is the hydroxide ion concentration of an aqueous 0.00353 M caffeine solution? The most basic nitrogen atom in caffeine has a Kb of 4.1 x10-4.
A concentration cell consists of two H2/H+half cells. Half cell A has H2 at 0.76 atm bubbling into 0.27M HCl. Half cell B has H2 at 0.54 atm bubbling into 1.7M HCl. Which half cell
Write the balance equations for the reduction of benzil or camphor assuming that each mol of NaBH4 provides four moles of hydrid.
The reaction 2 Mg(s) + O2(g) ® 2MgO(s) has associated with it a negative value forΔS, and it is a highly spontaneous process.The second law of thermodynamics states tha
Decant about 4 mL of the NaOH solution into a 500 mL polyethylenebottle. Dilute to 500 mL with previously boiled, deionized water cooled to room temperature. Calculate an approximate molar concentra
How would you compare the removal of polycyclic aromatic hydrocarbons with clay versus the removal of the PAH's with bentonite?
Table sugar (sucrose, C12H22O11) and table salt (NaCl) are both crystalline, colorless solids which are similar in outward appearance. You are given 100 grams of a mixture of these two solids.
50.0mL of a solution with calcium oxalate required 1.76mL of0.00101M premanganate to titrate it. What is the Ksp value for calcium oxalate?
A reaction takes place between sodium chloride and hydrochloric acid. The products of this reaction are sodium sulfate(Na2SO4) and hydrochloric acid. What is the balanced equation that represents this
A cylinder containing helium gas has a pressure of 235atm at 22 degreeC. What will be the pressure of the helium if the cylinder is placed in a container of liquid nitrogen at -196degree C?
What volume of water vapor is produced by burning 500g of gasoline at STP and a temp of 18 degreeC. Determine the density of propanegasC3H8, in grams per liter at 22 degree C and748 too??
What is the molarity of asodium vanadate (Na3VO4) solution if 35.6mL of the solution are needed to titrate a 0.759g sample of pure potassium sulfite?VO4-3+SO3-2+4H+--->VO++SO4-2+2H2O
What would you expect to be the general temperature and pressure conditions for an optimum yield of nitruc oxides,NO, by the oxidation of ammonia?4NH3(g) + 5O2(g) ----------> 4NO(g)+6 H2O(g); &De
You add 1.00 kg of the antifreeze ethylene glycol (C6H6O3) to your car radiator,which contains 4450 g water. What are the boiling points of the solution if Kf = 0.512.C/m andKb=1.86.C/m?
Calculate the vapor pressure lowering when 10.0ml glycerol (C3H8O3) is added to 500 ml waterat 50'C. At this temperature the vapor pressure of pure water is92.5 torr and its density is 0.988 g/ml. T
How many grams of aluminum can be formed by the passage of370. C through an electrolytic cell containing a molten aluminum salt?
A student used 2.05 x 10-3 moles of sodium hydroxide in an acid-base titration to neutralize an acid to the equivalence point. Show the complete ionic equation foraqueous sodium hydroxide ionizin
A student titrates a 250.00 mL sample of an acidic mine drainage with a 0.1273 M solution of KOH. It takes 50.81 mL of the potassium hydroxide to reach the equivalence point.
In earlier times,ethyl ether was used as an anesthetic. When five milliliters ofethyl ether (C4H10O), density 0.714 g/mL, is burned in a bombcalorimeter, the temperature rises from 23.5 oC to 39.7 o
A molecule of water is composed of two atoms of hydrogen and one atom of oxygen (H20). If the atomic mass number of hydrogen is 1 and the molecular mass of water is 18, the atomicmass of oxyen must be
Calculate the pH of a solution prepared by mixing two solutions:3.00 L of a solution containing 84.0 g of NaF and 1.00 L of a 0.250M HF solution. (Ka of HF = 7.0 x 10-4)
What is the pH of a solution of a strong acid like HCl acid,which is 6.06 x 10-2 M? HCl is a strong acid, so it is completely ionized in aqueous solution. This means the hydrogen ion concentration i
How would you monitor the progress of a column chomatography when the sample is colorless? Describe at least two methods.
A yellow compound, dissolved in methylene chloride, is added to achromatography column. The elution is begun sing petroleum ether asthe solvent.
An orange compound was added to the top of a chromatography column.Solvent was added immediately, with the result that the entire volume of solvent in the solvent reservoir turned orange.