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HPLC analysis of basic analytes is better to perform at low pH when they are fully ionized (2 pH units lower than analyte pKa). For the analyte with pka= 5.6 and 60/40 acetonitrile/water eluent composition what should be the pH of an aqueous portion of the mobile phase to ensure complete ionization
The solution freezes at -0.085C. How many grams of urea were dissolved to make this solution? Please show work
0.5865 g sample of lactic acid (HC3H5O3) is burned in a calorimeter whose heat capacity is 4.812 kJ/ oC. The temperature increases from 23.10oC to 24.95oC.Calculate the heat of combustion of lactic acid a. per gram b. per mole.
A volume of 75mL of H2O is initially at room temperature (22C). A chilled steel rod at 2.00 C is placed in the water. If the final temperature of the system is 21.0 Celsius, what is the mass of the steel bar?
Draw the structural formulas for any three compunds with the molecular formula C4H10O. If its an alcohol, classify each alcohol as primary, secondary, or tertiary?
A mixture of O2, CO2, and N2 has a total pressure of 697. torr. In this mixture the partial pressure of O2 is 143. torr and the partial pressure of CO2 is 197. torr. What is the partial pressure of the N2 (in torr)?
sample of anhydrous salt sodium sulfate Na2SO4 is allowed to absord water to form the decahydrate salt.
CsCl crystallizes in a unit cell that contains the Cs+ ion at the center of a cube that has a Cl- at each corner. Each unit cell contains __________ Cs+ ions and __________ Cl-, ions, respectively.
In which of the following carbohydrates are two different types of glycosidic bonds present
what is the weight of O in 742.0 g of citronella oil that has the chemical formula C10H18O
600 torr contains 50.0% Helium and 50.0% Xenon by mass. What are the partial pressures of the individual gasses?
The bond angles in H3O+ are:? a) slightly less than 109.5o b) exactly 109.5o c) slightly less than 90o d) exactly 90o
Calculate the amount of heat required to heat a 3.6 kg gold bar from 25 C to 64 C. Specific heat capacity of gold is 0.128 j/g C.
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