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Part A.1 and Part B.3. a. Why is it important to keep the developing chamber covered with plastic wrap during the development of the chromatogram? b. The developing chamber is not covered with plastic wrap during the development of the chromatogram. Will the Dion value for the cation be greater than or less than the actual value as a result of this technique error? Explain. 2. Part A.4. Explain how the appearance of the chromatogram might change if the chromatographic paper were initially wet with water or had come in contact with the skin. 3. Part A.4. Why was a pencil used to mark the chromatogram and not a ballpoint or ink pen? 4. Part B.1. Explain why the cation samples are repeatedly spotted and dried on the chromatographic paper. 5. Part B.3. The eluent is to be below the 1.5-cm line on the chromatographic paper. Describe the expected observation if the eluent were above the 1.5-cm line. 6. Part C.2. Explain why the center of the band is used to calculate the Rf value for a cation rather than the leading edge of the band. 7. Suppose two cations have the same Rf value. How might you resolve their presence in a mixture using paper chromatography?
At a certain temperature, the Kp for the decomposition of H2S is 0.726 H2S = H2+S initally only H2S is present at a pressure of 0.126 atm in a closed container. what is the total pressure in the container at equilibrium?
what do the bond angles of boron trifluoride suggest about the hybridization state of the boron atom of water
What explanation can you give as to why a dilute aqueous solution of PtCl42- is pale yellow to colorless, but a concentrated solution is deep red?
How much time is required to produce 200g of alumimun metal for molten aluminum oxide dissolved in cryolite, if you use a 12.0 amp current.
boron has two naturally occuring isotopes,, 10B (19.9%) and 11B(80.1. althought the b2 molecule doesn not exist naturally on earth, it been been produced in the laboratory and been observed in stars..
The student next added 3M KOH solution to the aqueous solution and Mg(OH)2 precipitated. After filtering the solution and drying the precipitate, the student recovered 1.10g of Mg(OH)2. Calculate the percent Mg(OH)2 in the mixture
Calculate the wavelength of light emitted from a hydrogen atom when it undergoes a transition from the n=11 level to n=5. µm
The standard enthalpy of atomization of an element is the energyrequired to convert 1 mole of an element in its most stable form at25 centigrade to 1 mole of monatomic gas. Given that the standardenthalpy of atomization for sodium is 108.4 kJ mol-..
A solid sample containing some Fe 2+ ion weighs 1.062g. It requires 24.12 mL 0.01562 M KMno4 to titrate the Fe2+ in the dissolved sample to a pink end point.
Ozone, O3, acts as filter of harmful UV radiation in the stratosphere by absorbing light with a wavelength of 290 nm. The photon at 290 nm causes an O-O bond in O3 to give O2 and O. Draw Lewis resonance structures of Ozone molecule
The sucrose is being converted to other sugars in a reaction which is first-order with respect to the sucrose concentration. Exactly 30 minutes later, the sucrose concentration has fallen to 0.131 mol/L. Calculate the value of the rate constant in..
a 100 g sample of water at 23C is added to a 45 g sample of water at 99C. what is the final temperature of the sample
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