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Only very pure phosphoric acid is used in food products. An older term for soft drinks is phosphates. This name was applied because pure phosphoric acid was used to produce a tart taste in some beverages and to help dissolve the other ingredients.
(a) What is the pH of a solution that is known to be 5.58 M in H3PO4?
(b) What would be the approximate concentration of PO43-(aq) in that solution?
If 67.0 mL of 0.119 mol/L NaOH(aq) and 35.0 mL of 0.193 mol/L HA(aq) are mixed, then what is [HA] at equilibrium. Assume that HA is a weak monoprotic acid with pKa=6.23 at 25oC. Give your answer with three significant figures
How many grams of dry NH_4Cl need to be added to 1.60 L of a 0.800 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.99? Kb for ammonia is 1.8*10^{-5}.
When 7.51 grams of propane reacts with excess oxygen how many grams of carbon dioxide are formed
Its volume is 2.0 x 10^2 mL and its pressure is 750 torr. what is the molar mass?
What is the total molar concentration of all the ions in 0.030 M solutions of the following salts in water a) 0.030 M KCl = ________ M ions b) 0.030 M CuSO4 = _____ M ions c) 0.030 M CaCl2 = _______ M ions
An unknown compound contains only C, H, and O. Combustion of 4.40 g of this compound produced 8.79 g of CO2 and 3.60 g of H2O. What is the empirical formula of the unknown compound. CHO
Kc for this reaction is 5.1 at 400 degrees C. Calculate the equilibrium concentrations of the four gases if the initial concentration of each of them is 0.050M.
At this temperature, calculate the number of moles of NO2(g) that must be added to 2.88 mol of SO2(g) in order to form 1.20 mol of SO3(g) at equilibrium.
Water molecules can undergo a self-ionization reaction to produce very small concentrations of hydronium and hydroxide ions
20.00 mL of 0.160 M HC2H3O2 (Ka = 1.8x10-5) is titrated with 0.200 M NaOH. What is the pH of the solution before the titration begins
a steel cylinder holds 1.60 g of ethanol c2h5oh. what is the pressure of the ethanol vapor if the cylinder has a volume
A non-SI unit of mass used in pharmaceutical work is the grain (gr). (15 gr =1.0g) An aspirin tablet contains 5.0 gr of aspirin. A 155-lb arthritic individual takes two aspirins tablets per day. What is the quantity of aspirin in two tablets, expre..
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