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Using the Henderson-Hasselbalch equation determine the pKa for illinic acid from the following values: At pH 9.02, the concentration of illinic acid and its conjugate base, illinate, are 0.075 and 0.025, respectively. Enter the pKa values with 2 decimal points.
What is the composition in mole fractions of a solution that has a vapor pressure of 39 at 20 ? Express your answer using two significant figures.
a sample of a binary compound of boron and chlorine weighing 2.842 g occupies .153 L. this sample is decomposed to give 0.664 g solid boron and enough gaseous chlorine to occupy .688 L at the same temperature and pressure. determine the molecular ..
five grams of the specified pure solvent is placed is placed in a variable volume piston. What are the molar enthalpy and total enthalpy of the pure system when 50% and 75% have been evaporated at
Calculate the pH of this buffer solution after the addition of 0.010 moles of solid sodium hydroxide to the buffer
Joseph Priestley discovered oxygen in the eighteenth century by using heat to decompose mercury(II) oxide: 2 HgO(s) + heat --> 2 Hg(s) + O2(g)
How Many Grams of CaCl2 should be dissolved in 500 ml of water to make a .20 M solution of Calcium Chloride
A glass bottle of normal capacity 250 cm^(3) is filled brim full of water at 20 degrees Celsius. If the bottle and contents are heated at 50 degrees Celsius, how much water spills over?
The frequency doubled output of a Nd3+ YAG laser has a wavelength of 532nm. If each pulse of light has a total energy of 0.550J and the repetition rate of the laser is 30Hz
Explain The Chemistry of Food Composition, find the nutritional values/info in food from USDA Nutrient Data Laboratory?
What is the density of a block of marble that occupies 253 cm and has a mass of 752 g? Answer in units of g/cm
.1500g of an unknown sample was passed through a column of Amberlite-IR-200(+) resin and titrated with .2050M NaOH. If 9.75mL of titrant was required to reach phenolphthlein endpoint,
The half-life of tritium (31H) is 12.3 years. If 55.0 mg of tritium is released from a nuclear power plant during the course of a mishap, what mass of the nuclide will remain after 49.2 years?
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