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Acetylsalicylic acid (aspirin), HC9H7O4, is the most widely used pain reliever and fever reducer. Determine the pH of a 0.018 M aqueous solution of aspirin. Ka = 3.2 x 10 -4
The half-life for the radioactive decay of [U]-238 is 4.5 billion years and is independent of initial concentration. Part A How long will it take for 20% of the [U]-238 atoms in a sample of [U]-238 to decay?
A piece of metal with a mass of 151 g is placed in a 50 mL graduated cylinder. The water level rises from 20. mL to 35 mL. What is the density of the metal?
A 2.000-L flask was filled with 0.0393 mol SO2 and 0.0197 mol O2. At equilibrium at 907 K, the flask contained 0.0299 mol SO3. How many moles of each substance were in the flask at equilibrium?
Sodium fluoride is added to many municipal water supplies to reduce tooth decay. Calculate the pH of a 0.00304 M solution of NaF
The pH of a sample of rain is found to be 3.2. Calculate the percentage of HSO4- that is ionized in this sample, given that the acid dissociation constant for the second stage of ionization of H2SO4 is 1.2E-2.
1) Flame colours as an analytical technique: a) The principle behinde how this work
Diamonds are measured in carats where 1 carat= 0.200 g. The density of diamond is 3.51 g/cm^3. What is the volume of a 2.50-carat diamond
A 54.7-g sample of aluminum at 95.0 oC is dropped into 35.0 g of water at 40.0 oC. What is the final temperature of the mixture? (specific heat capacity of aluminum = 0.89 J/goC; specific heat capacity of water = 4.184 J/g degreesC)
What is the pH of the solution? The K of hypochlorous acid is 3.8*10-8. Please explain how to get this using the Henderson-Hassalbach Equation.
Would you expect the carotenoid pigment fraction to come off sooner or later than it did with 95:5 Hexane:Acetone? What effect would you expect if you used 100% hexane instead
calculate the mass percent of a rm nacl solution in which 110 g of rm nacl is dissolved in 2.41 l of water at 25 rm
A balloon will inflate because the pressure inside the tank is greater than the atmospheric pressure pushing on the outside of the balloon. Assuming the balloon could expand indefinitely and never burst, the pressure would eventually equalize caus..
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