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Question- You are asked to prepare a pH=4.00 buffer solution starting from 1.25L of 2.00M solution of HF. how many grams of NaF should be added to prepare the buffered solution? Ka=6.8 x 10^-4
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100 mL of 0.150 M acid H2A are mixed with 100 mL of 0.1600 M NaOH. Calculate the [H+] of the resulting solution at equilibrium. Ka1 = 1.0 x 10^-5 Ka2 = 1.0 x 10^-7
what is the molar mass of the solute? The boiling point elevation constant for water is .512 C/m.
A certain reaction has an activation energy of 27.03 kJ/mol. At what Kelvin temperature will the reaction proceed 3.00 times faster
Currently experiencing and apply the steps of thescientific method
The volume of a teaspoon is about 5cm, and Ben found this would cover half acre pond (2000 m2). Find the thickness of the oil film.
A water desalination plant is set up near a salt marsh containing water that is 0.10 M NaCl. Evaluate the minimum pressure that must be applied at 20.C to purify the water by reserve osmosis. Assume NaCl is completely dissociated.
Find the pH and volume (mL) of 0.0372 M NaOH needed to reach the equivalence point(s) in titrations of 20.0 mL of 0.0892 M H2SO3 (two equivalence points)
When 1 of a fuel is burned at constant pressure, it produces 3452 of heat and does 13 of work. What is the value of delta H for the combustion of the fuel?
How many grams of C6H14 are needed to heat 1.00 kg of water from 29.5 degrees celsius to 77.5 degrees celsius. Assume that all of the heat released during the combustion is used to heat the water.
A 10g sample containing an analyte was transferred to a 250 mL flask and diluted to volume. A 10mL aliquot of this solution, diluted to 25mL, yielded a signal of .235 units. A second 10 mL aliquot was spiked with 10mL of 1ppm standard solution of ..
The average radius of a molecule of lysozyme, an enzyme in tears is 1430pm,what is the radius in nanometers.
an organic substance has an enthalpy of vaporization of 29.0 kjmol. the compound has a vapor pressure of 524 mm hg at
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