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An acetic acid buffer solution is required to have a pH of 5.27. You have a solution that contains 0.01 mol of acetic acid. How many moles of sodium acetate will you need to add to the solution? The pKa of acetic acid is 4.74. Show all calculations in your answer. pH = pKa + log [A- ]/[HA]
not enough air is pumped into a raft to completely fill it out. the atmospheric pressure is 14.7 psi. what is the pressure of the air inside the raft?
Draw the structures of salicylic acid and aspirin. Circle and identify the functional groups present in each compound and sulfuric acid is a catalyst. What does that mean?
Ice at 0.0° C is mixed with 9.00 102 mL of water at 23.0° C. How much ice must melt to lower the water temperature to 0.0° C
A volume of 1.86 L of H2 is trapped in a nuclear reactor at 870oC and 125 atm. What is the partial pressure (torr) of the H2 after it is released into a container vessel of 2.8 x 104 m3 at 25oC
Name an element in the fourth period of the periodic table with a total of 4 4p electrons. Name an element in the fourth period of the periodic table with a total of 3 3d electrons Name an element in the fourth period of the periodic table with a ..
Potable water (drinking water) should not have manganese concentrations in excess of 0.05 mg/mL. If the manganese concentration is greater than 0.1 mg/mL, it imparts a foul taste to the water and discolors laundry and porcelain surfaces.
What is the percent by mass of oxygen in a gaseous mixture whose molar composition is 0.500% CO2 and 99.500% air. The composition of air is 21% mole O2, 79% mole N2, and has an average molar mass of 29.0 g/mol.
Calculate the amount of work in kilojoules (kj) needed to move an object that weighs 500 grams through a distance
A 32.5g cube of aluminum initially at 45.8C is submerged into 105.3g of water at 15.4C. What is the final temperature of both substances at thermal equilibrium. Assume that the aluminum and the water are thermally isolated from everything else.
Discuss the possible elimination products for reactions of 1butanol, 2 butanol and 1-bromobutane, and 2-bromobutane, and discuss the physical state of those products and how they were collected
Fermium-253 has a half life of 0.334 seconds. A radioactive sample is considered to be completely decayed after 10 half lives. How much time will elapse for this sample to be considered gone?
A student does a mini-titration with an unknown acid by adding 13 drops of 2M NaOH to 9 drops of the unknown solution. What is the concentration of the unknown acid
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