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Determining the pKa's of acetic acid (CH3COOH) and hydrofluoric acid (HF) (using 20 mL 0.2 M solutions) by measuring the titration curves of the two using 0.2 M NaOH as the titrant. Based on the pKa determined from the titration curve, select the better acid to make a pH 5.0 buffer solution ?
A sample of helium gas has a volume of 8.23 L at 258.8 K and 2.049 atm. How many helium molecules does it contain
One mole of Nitrogen at 25 C and 1 bar is expanded reversibly and isothermally to a pressure of 0.132 bar. (a) How much work w is done on the gas? (b) How much work is done on the gas if it is expanded against constant pressure of 0.132 bar
The gas pressure in an aerosol can is 1.8 atm at 25oC. If the gas is an ideal gas, what pressure would develop in the can if it were heated to 475oC
What is the concentration of the chloride ion (in M) in a solution which contains 57.6 g aluminum chloride in 501 mL of solution
Barium sulfate is a very insoluble compound. Please give reasons for compounds like barium sulfate or barium phosphate to be insoluble
Calculate pH of the solution after addition of 0.20 mols of KOH. The Ka for HNO2 is 4.3*10^-4
a litre of solution containing 0.1 m of ch3cooh and 0.1 m of ch3coona provides a buffer of ph 4.74 . calculate the ph
The optimal temperature for the action of lactate dehydrogenase is 36*C. It is irreversibly inactivated at 85*C, but a yeast containing this enzyme
The melting temperature of substance X is 42 ?C at 1 atm pressure. What is the standard entropy change of fusion, S fusion (Assume that H fusion and S fusion don't change with temperature.)
understanding the basics of thermal chemistry.1. the second law of thermodynamics indicates that a system.a. tends to
The average mass of an atom of sulfur is 5.33 X 10-23 g. How many sulfur atoms are present in a 100.0g sample of sulfur
3.45 g of an unknown gas at 41 °C and 1.00 atm is stored in a 1.25-L flask. What is the density of the gas. What is the molar mass of the gas.
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