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Given a weak acid with a pK of 6.5, 1) In what pH range would this be an effective buffer? 2) At pH of 7.5 what percentage of this molecule is in the conjugate base form? 3) What is the ratio of ionized to unionized molecules at pH 8.5? 4) What percentage of the molecule is ionized at pH of 8.5
the delta H OF vaporization for a new substance is 45 kj/mol and its delta H sublimation is 62 kj/mol, how much energy is needed for freezing 2.75 mol of a substance
If 7.50 g of the unknown compound contained 0.250 mol of C and 0.500 mol of H, how many moles of oxygen,O, were in the sample?
A typical aspirin tablet contains 325 mg of acetylsalicylic acid ( HC9H7O4). Calculate the pH of a solution that is prepared by dissolving five aspirin tablet(s) in one cup (237 mL) of solution. Assume the aspirin tablets are pure acetylsalicylic ..
Reductive amination can be used to form primary, secondary, and tertiary amines. Secondary amines are more basic than primary amines due to extra electron donation by the alkyl groups.
the compound freon-12 (CCl2F2) is used as a coolant in refrigerators and air conditioners. It is produced through the following reaction: CCl4+SbF3-> CCl2F2+SbCl3. If 15.0 mole of freon-12 are to be produced, what mass of the carbon tetrachloride ..
What was the percentage by mass of Mg(OH)2 in the original sample? [Hint: When Mg(OH)2 or Al(OH)3 reacts with HCl(aq), the products are a chloride salt, water and CO2(g). Assume that all of the CO2(g) leaves the solution without reacting.]
Calculate the CO3- concentration of a 5.45 x 10-4 M H2CO3 (carbonic acid) solution. Ka1 and Ka2 of carbonic acid are 4.3 x 10-7 and 4.8 x 10-11 respectively.
13When heated in a flame, sodium atoms emit light with a frequency of 5.09 × 1014 s-1. What is the wavelength of this radiation in nm? [Data: c = 2.998 x 108 m/s ]
A calibration curve for absorbance versus the concentration of the chemical indicator crystal violet is found to have a slope of 19. If a sample of unknown concentration has an absorbance of 1.32
Why is the enthalpy based on the moles of NH3 and not HCl? c. Calculate the percent error in part (a) if the accepted Hrxn is -55.0 kj/mol
For a current of 360 A at 3.67 V, how much electrical energy (in kw-hr) is consumed in the production of 1 kg of aluminum? (A kW-hr is 3.6 x106 J.)
During ther processing of black-and-white film, excess silver (I) halides are removed by wadhing the film in a bath containing sodium thiosulfate. This treatment is based on the followig complexation reaction:
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