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What mass of NaH2PO4 must be added to 1.20 L of 0.20 M Na2HPO4to make a buffer solution whose pH=6.90? pKa2(H3PO4)=7.21.
A primary sedimentation tank has 140 mg/L of BOD in its effluent. The effluent flows into an activated sludge process at a rate of 4.8 MGD. The treatment must reduce the BOD by 125 mg/L so that it can meet an effluent requirement of 15 mg/L. How m..
By using photons of specific wavelengths, chemists can dissociate gaseous HI to produce H atoms with accurately known speeds. When HI dissociates, the H atoms move away rapidly, whereas the relatively heavy I atoms move little
Draw the product that is formed when 1-pentyne is treated with an excess of hydrogen gas and a nickel catalyst
a stock solution is prepared by adding 28 ml of 0.2 m na3po4 to enough water to make 76 ml. what is the po43-
What volume (mL) of a concentrated solution of NaOH (6.00 M) must be diluted to 200. mL to make a 0.88 M NaOH solution
the energy of a photo is 3.16 times 10^-19J. what is the wavelength of the corresponding light. what is the color of this light.
4.00 mL if 0.100M t-BuCl are mixed with 4.00mL of 0.0100 M NaOH and 2.00 mL of Distilled water. Calculate the initial Molarity of t-BuCl. How many moles of t-BuCl will have reacted when bromophenol blue changes colors
n2o4 g lt----gt 2no2 gpure n2o4 was placed in a closed flash at 127 degrees celsius at a pressure of 4.38 x 10 -2
Pu-239 (nuclear mass of 239.0006 amu) decays by alpha emission to U-235 (nuclear mass of 234.9934). Calculate how much energy is given off by the decay of 2.00 mg of Pu-239.
You dissolve 650.0 g of sugar (C12H22O11) in 726 mL of water. The density of wat is 1.00 g/mL.
What is the pH for the solution made from 11.10 mL of 0.278 M HCl solution mixed with 70.90 mL of 0.1300 M ammonia solution ? Note that the pKa for NH4+ is 9.241
How much heat energy, in kilojoules, is required to convert 58.0 g of ice at -18.0 *C to water at 25.0 *C ?
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