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The active ingredient in aspirin is acetylsalicylic acid, HC9H7O4, a monoprotic acid with Ka = 3.3 x 10-4 at 25°C. What is the pH of a solution obtained by dissolving two aspirin tablets, each containing 325 mg of acetylsalicylic acid in 100. mL of water?
In a crystal of gold, centers of individual atoms are approximately 0.288 nm apart. How many gold atoms would lie on a 3.73 inch line?
A solution of potassium permaganate is standardized with iron metal, a primary standard. The iron is dissolved in acid, reduced to Fe(II), and titrated with permanganate.
Problem- If 79.0mL of 0.127 mol/L NaOH(aq) and 50.0mL of 0.189 mol/L HA(aq) are mixed, then what is [HA] at equilibrium? Assume that HA is a weak monoprotic acid with pKa=5.55 at 25oC.
Find out the volume of a .750M K2Cr2O7 solution required to completely react with 5.10g Cu. The molecular mass of K2Cr2O7 is 294.185.
answer the following questions assuming the known reactant is used up in making the rust. show all your work. use the
how many grams of ammonium nirtate must have reacted if 3.75dm3 of nitrogen gas was collected over water at 26C and 97.8 kPa
Consider a system of two Einstein solids, with NA = 300, NB = 200, and qtotal = 100. Compute the entropy of the most likely macrostate and of the least likely macrostate. Also compute the entropy over long time scales, assuming that all microstate..
Discuss the two main mechanisms in nucleophilic substitution reactions. Provide examples, show reaction diagrams, discuss controls of reaction rates, stereochemistry
Standard Temperature and Pressure of Chlorine, Chlorine is widely used to purify municipal water supplies and to treat swimming pool waters. Suppose that the volume of a particular sample of Cl2 gas is 8.70 L at 895 torr and 240C.
For a 0.13 M solution of formic acid, HCOOH, the pH = 2.40. Calculate Ka for formic acid.
A solution is prepared by dissolving 0.60g of nicotine in water to make 12mL of solution. The osmotic pressure of the solution is 7.55atm at 25 degrees C
Calculate the solubility of zinc hydroxide Zn(OH)2 in 1.10 M NaOH. Ksp=3.0x10^-16 for Zn(OH)2 Kf=3.0x10^15 for Zn(OH)4^-2
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