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A buffer is made by dissolving 11.2 g of sodium dihydrogen phosphate, NaH2PO4, and 17.7 g of disodium hydrogen phosphate, Na2HPO4, in a liter of solution. What is the pH of the buffer?
How many grams of CaCl2 are needed to make 968.1 g of a solution that is 35.5% (m/m) calcium chloride in water? (Note that m/m has the same meaning as w/w.)
The following reaction has equilibrium constant (kc) of 13 at 1700 K. The initial concentration of HI is 1.17 x 10^-3 M, H2 is 3.25 x10^-4 M, and l2 is 3.25 x 10^-4 at 1700k. Calculate Qc and determine which direction the system will travel as it ..
How much energy is required to vaprorize 150 ml of c6h6 at 25 c? the density of c6h6 is 0.87 g/ml and the enthalpy of vaporization is 30.8 kj/mol
you are given a mixture of two cations. when this mixture was treated with 6 m hcl there was no precipitate. it gave a
Did the. Temperature oof the water rise or fall when the nh4no3 was added? Explain this in terms of heat ttransfer.
how much heat in is required to warm 10.0 of ice initially at -11.0 to steam at 111.0? the heat capacity of ice is
Why is it necessary to add sodium chloride to the steam distillate before carrying out ether extraction
Calculate the standard free energy change and the equilibrium constant for the following reaction at 25°C: (all aqueous solutions are 1 M) Au(s) + Ca2+ (aq) ? Au3+(aq) + Ca(s)
A goose is flying south for the winter at a constant speed. Keep in mind that one mile is 1.61 , and one pound is 454 .The goose has a mass of 20.1
what happens to Fe+SCN=FeSCN when water is added. which way is the equilibrium shift and why. why does the color intensity increase
consider the reaction of 5.0g of propane with 10.0ml ofmolecular bromine to form 2,2 dibromopropane and hydrogenbromide. a. look up the molecular weight of propane (44.1) and calculate the moles of propane present before the reaction
What are the equilibrium pressures of N2O4 and NO2 when 0.61 mol of each gas are introduced
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