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Calculate the amounts of Na2HPO4 and NaH2PO4 (in grams) needed to prepare 200 mL of a buffer with pH = 8.25 so that the sum of concentrations of HPO42- and H2PO4- ions is 0.5 M. ?pKa1 =2.12, pKa2 = 7.21, pKa3 = 12.38 ?[Na2HPO4 MW = 141.96g/mol] [NaH2PO4 MW = 119.96 g/mol]
A container with a volume of 101 L contains how many atoms of argon gas at STP?
Calculate the molar concentration of OH - ions in an 1.43 M solution of hypobromite ion, BrO- (Kb = 4.0 10-6).
when 50.0 g of Copper are reacted with silver nitrate solution Cu + 2AgNo3 - Cu(No3)2 +2 Ag 148 g of silver are obtained. what is the percent yeild of silver obtained?
What is the molarity of a solution of 12.0 g of NH4Br in enough H2O to make 240 mL of solution?Answer in units of M.
Solve Virial equation (the virial equation expanded in 1/ Vm )are expansions in p and 1/Vm,respectively
Suppose that you developed your own new temperature scale, denoted oN. You chose 30.0oN as the temperature of freezing water and 280oN as the temperature of boiling water at 1.0 atm pressure.
a perfect gas undergoes isothermal compression which reduces its volume by 2.20 L. the final pressure and volume of the gas are 3.78x10^3 torr and 4.65 L, respectively
Mercury-205 has how many protons, neutrons, electrons, and electrons in the 1st quantum shell and in the compound BCl3 which is the more electronegative element?
The concentrated sulfuric acid is 98.0 percent h2so4 by mass. the density of the solution is 1.83 g/ml. the molar mass of h2so4 is 98.08 g/ml.What is the mass of h2so4 in 100.0g of concentrated sulfuric acid solution?
a solution contains 55 grams of ascorbic acid in 250 g of water freezes at -2.34 degrees C. calculate the molar mass of the solute
How much energy is released during the complete combustion of 433 grams of cyclopropane
For the first order decomposition of acetone at 650 K, the concentration of acetone was 0.350 M after 25.0 min and 0.170 M after 40.0 min.
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