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A student made an acetic/acetate buffer by mixing 4.665 g of sodium acetate into 600.00 mL of a 0.0242 M acetic acid solution. What would the pH of the solution be as the result of the addition of 0.0050 mols of hydrochloric acid to the buffer?
What is the half-life in minutes of a compound if 75.0 percent of a given sample decomposes in 85.0 minutes? Assume first order kinetics
Calculate how much you would obtain wiht 1 x 0.6 mL extraction. 3. Which method is more efficient.
Draw two pictures. One of a graduated cylinder filled with liquid in which it is possible to read its volume as 10.oo ml and one of a second graduated cylinder filled with liquid
At 50 degrees C, the value of pKw (the dissociation constant for water) is 13.262. Calculate the pH of water at this temperature.
The pH increased from 5.8, the normal pH of a cigarette , to pH 6.4 by addition of ammonia. How many moles of ammonia are required to produce this pH change per cigarette (volume approx. 5ml)?(Assume that no unprotonated ammonia will exist at pH 6..
at 30 km above the earths surface (roughly in the middle of the statosphere) the pressure is roughly 0.013 atm and the gas density is 3.74 x 10^23 molecules/m^3 assuming N2 is represetative of the stratosphere using the collisional diameter inform..
Calculate the concentration of Cu2+ in a solution prepared by adding 5.2 x 10 -3 mol of CuSO4 to 0.450L of 0.38 M NH3.
Boron has two naturally occurring isotopes, 10B (19.9%)and 11B (80.1%). Although the B2 moleculedoes not exist naturally on Earth, it has been produced in the laboratory and observed in stars. (a) How many differentB2 molecules are possible? (b) W..
Describe the titration curve for the titration of a weak base with a strong acid. Indicate the chemical reaction, the points that correspond to the equivalence point, the pH = pKa and the region with maximum buffering.
The average per month of energy use is 879 kWh (kilowatt) of electricity. If the price of one kWh is $0.0668 how much money will spend on electricity for one year?
Someday, cars may be powered by clean H2/O2 fuel cells and electric motors. Under standard conditions, such a fuel cell can develop 1.229 volts. If the oxygen is obtained from air (at P=0.21 bar), what pressure of H2 would be required to develop 1..
Rubidium-87 decays by beta decay with a half-life of 4.9 x 10^10 yr. How many 87Rb atoms are in a moon rock sample that has a rubidium decay rate of 3500 disintegrations per hour
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