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Explain why recrystallization, as a general technique, is usually effective at removing a few percent of impurity, even though the solubility (g/mL) of the impurity might be similar to that of the main component. Where does the impurity end up? Why doesn't it crystallize along with the main component?
How much energy would be absorbed or re- leased by the H2O in the process 30 grams H2O(g) at 100?C → 30 grams H2O(l) at 20?C.
Explain the order of elution you observed while performing the gas chromatography for this experiment. What property of the product molecules seems most important in determining relative retention times?
Calculate the entropy change for vaporization of 18g of H2O? The molar enthalpy of vaporization for water is 44 kj/mol and the boiling point is 100 degrees celsius
The daily energy requirement for an active adult human is around 2500 calories per day. A nutritional calorie is equal to 4.2 kJ of energy. If each ATP contains -30 kJ/mol under standard conditions, how many molecules of ATP does the body require ..
If a 180 mg piece of gold (density =19.32 ) is hammered into a sheet measuring 2.41.0 , what is the average thickness of the sheet in meters.
Why do you think we need to convert the calcium carbonate to calcium chloride befoe we do our EDTA titrations? What specific condition in our titrations require this?
What is the pH of a buffer solution that is 0.0100 M in hypochlorous acid, HCIO, and 0.0300 M in sodium hypochlorite, NaCIO? (the Ka for HCIO is 3.5 x 10-8.)
How many mmoles of HCl reacted with the Na2CO3? c. Calculate the molarity of the HCl solution.
For each molecule below, specify the polarity of the bonds and the overall polarity of the molecule. Cl2Be, H20, O3
Assume that the amino acids with ionizable side chains have the following pKas: Asp 3.65; Glu 4.25; His 6.0; Lys 10.53, Arg 12.48; Cys 8.18; Tyr 10.07. Also Assume that the a-amino group has a pKa of 9.62, and the a-carboxyl group has a pKa of 2.3..
Determine the acid dissociation contant for a 0.10M acetic acid solution that has a pH of 2.87. Acetic acid is weak monoprotic acid.
Calculate the solubility product constant for Pb(IO3)2 (4.3 x 10^-5 M), given that the molar concentration of saturated solution is as indicated in parenthesis.
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