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Phosphate buffer has 3 ionizable groups, with pKa's of 2.15, 7.2, and 12.45. A 1.20 M solution of this buffer (250 mL) is found to have a pH of 6.0. A biochemist adds 30 mL of 1.0 M NaOH to this buffer.
a) What is the ratio of Na2PO4 to Na2HPO4 at the start of the experiment?
b) What is the resultant pH?
c) how many milliliters of 0.450 M HCl can you add to the final solution in part b) and still maintain as a good phosphate buffer (ie. within 1 pH unit of pKa).
A gas is compressed from an initial volume of 5.60 to a final volume of 1.23 by an external pressure of 1.00 . During the compression the gas releases 123 of heat. What is the change in internal energy of the gas?
A mixture of gases contains 2.89 g of N2, 5.38 g of H2, and 9.00 g of NH3. If the total pressure of the mixture is 2.24 atm, what is the partial pressure of each component?
compressed gas cylinder contains 1.00 x 103 g of argon gas. The pressure inside the cylinder is 2050 psi at a temperature of 18oC. How much gas remains in the cylinder if the pressure is decreased to 650psi at a temperature of 26oC?
Two students measure the density of gold. One works with a 100-g bar of pure gold. The other works with a 200-g bar of pure gold. Which student measures the larger density.
What is the pH at the equivalence point? the Ka of hydrofluoric acid is 3.5x10^-4.
One liter of a buffer solution is prepared by dissolving 0.115 mol of NaNO2 and 0.070 mol of HCl in water. What is the pH of this solution? If the solution is diluted two fold with water, what is the pH?
Sulfur, S8, combines with oxygen at elevated temperatures to form sulfur dioxide. If 288 oxygen molecules are used up in this reaction, how many sulfur molecules reacted. In the reaction above, how many molecules of sulfur dioxide were formed.
Suflur dioxide may be catalytically oxidized to sulfur trioxide. How many grams of sulfur dioxide could be converted by this process if 100.0 grams of oxygen are available for the oxidation?
What mass of ethylene glycol, HOCH2CH2OH, must be dissolved in 4.510 kg of water to result in a freezing point of 18.0°C? What is the boiling point of the same solution?
A pressure measuring device indicates that the blood pressure of a normal person oscillates between 120 mm Hg (at the peak of the heartbeat) and 80 mm Hg (between heartbeats).
if equal masses of N2 and H2 (7.00 grams each) are combined to produce ammonia NH3, how many grams of ammonia could be produced at maximum yield?
volume of 20.0 mL of a 0.190 M HNO3 solution is titrated with 0.550 M KOH. Calculate the volume of KOH required to reach the equivalence point.
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