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Thin-layer chromatograph------Describe how the Rf for a compound will change as the developing solvent is made more polar. What is meant by "developing" a TLC plate? What is meant by "visualization" of a TLC plate?
Provide a structure for the following compound: EI mass spectrum: two molecular ions of about equal intensity at m/z = 180 and 182; IR: 1740 cm-1; 1H NMR
The enthalpy change when a strong acid is neutralized by strong base is -56.1 kJ/mol. If 12.0 mL of 6.00 M HBr at 21.30°C is mixed with 300. mL of 0.250 M NaOH
A 13.4-g sample of CaCl2 is dissolved in 109 g of water, with both substances at 25.0°C. Calculate the final temperature of the solution
Consider the following reaction: CO(g)+H2O(g)in equilibrium with CO2(g)+H2
Calculate the concentration of a NaOH solution if 0.1379 g of succinic acid (H2C4H4O4, 118.09 g/mol) requires 12.4 mL of NaOH solution
if the hindenburg held 2.0 times 10^5 m^3 of hydrogen gas at 23 degrees C and 1.0 atm, what mass of hydrogen was present
What is the correct net ionic equation, including all coefficients, charges, and phases, for the following set of reactants?
Describe a common buffer system and elution method in ion exchange chromatography. What are the salt ions in the elution buffer good for
63mL of a 1.70 M solution is diluted to a volume of 218 mL. A 109mL portion of the solution is diluted using 117mL of water. What is the final concentration?
A voltaic cell is based on a Co2+(aq)|Co(s) half-cell and an AgCl(s)|Ag(s) half-cell. Calculate the standard cell potential.
what mass of aspirin can be prepared by reacting 5.00 g if salicylic acid with an excess of acetic anhydride?
An absorption measurement of this ASA solution at 275 nm in a UV-vis spectrometer with a 1.00 cm cell was 0.78. The solvent had an absorbance of 0.01 at 275 nm. Measurement of a 4.05x10-4 M ASA standard solution at 275 nm was 0.579.
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