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An experiment that illustrates both chemical and electrolyticreduction by the preparation of ammonium vanadium (III) sulfate,(NH4)V(SO4)2.12H20 also known as vanadium alum. Ammonium metavanadate NH4VO3 is reduced by sulfur dioxide to vanadium IV as the vanadyl ion VO2+. This is then reduced by electrolysis ata graphite cathode to vanadium (III).5g of ammonium metvanadate had 4ml of water added to it. Then20ml of SO2/sulfuric acid solution (1:4 concentrated sulfuric:water) was added which was saturated with SO2. An SO2 bubbler head was attached to the flask. The flask was stoppered and stirred until metavanadate was reduced to vanadylsulfate. The solution was then transferred to a beaker and boiled to expel excess sulfur dioxide.An electrolytic reduction to vanadium (III) then took place with the vanadyl sulfate solution inside the porous pot and sulfuricacid outside.Questions are:(a)What is the coordination geometry about the vanadium ion incrystals of the alum?(c)Write balanced equations for each reduction step(d)Assuming an average current of 1.75amps is passed during theelectrolysis, calculate how long it would take to reduce all of theV(IV) in the sample to V(III)?
Calculate the molar mass of the biomolecule. for carbon tetrachloride, the boiling-point constant is 5.03 degrees C x kg/mol, and the boiling point of pure carbon tetrachloride is 76.50 degrees C.
Calculate the concentrations of all species in a 1.10 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1=1.4x10^-2 and Ka2=6.3x10^-8.
Amount of H2O2 in 15.8 g of hair bleach was obtained by titration with a standard KMnO4 soln.
If a 220 mg piece of gold (density =19.32 {rm g}/{rm cm}^{3}) is hammered into a sheet measuring 2.5times1.0 {rm ft}, what is the average thickness of the sheet in meters?
Calculate the number of 5.70m NaOH must be added to 666 ml of a buffer that contains .0205m C2H4O2 and .0260m C2H3NaO2 to increase the ph to 5.75.
calculate the number of microstates, W, that have this energy. Make sketches of these microstates. Calculate the corresponding entropy for each state.
A solution was prepared by mixing 50.00 mL of 0.190 M HNO3 and 124.00 mL of 0.150 M HNO3. Calculate the molarity of the final solution of nitric acid.
A voltaic cell is constructed with an Ag/Ag+ half-cell and a Pb/Pb2+ half-cell. Measurement shows that the silver electrode is positive. Write balanced half-reactions and the overall spontaneous reaction.
What is the total number of joules absorbed by 65.0 g of water when the temperature of the water is raised from 25.0 degrees celsius to 40 degrees celsius?
When strontium bromide (SrBr2) is heated in a stream of chlorine gas, it is completely converted to strontium chloride
Ascorbic acid is titrated with 23.1 mL of 0.5 M KIO3. How many moles of ascorbic acid are present?
A proton in a linear accelerator has a de Broglie wavelength of 117pm. what is the speed of the proton?
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