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1. The pka values of a compound with two ionizable groups are pk1=4.10 and pk2 between 7 and 10. We have 10 mL of a 1.0 M solution of this compound at a pH of 8.0. She adds 10.0 mL of 1.0 M HCL, which changes the pH to 3.20. What is pk2?
2. Histidine has ionizable groups with pKa values of 1.8, 6.0, and 9.2. A biochemist makes up 100 mL of a 0.100 M solution of histidine at a pH of 5.40. She then adds 40 mL of 0.10 M HCl. What is the pH of the resulting solution?
Cisplatin, an antitumor ingredient, has the formula Pt (NH3)2Cl2. What is the molar mass of cisplatin? Calculate the mass percent of platinum present in cisplantin.
If you know the balanced equtaion of a reation and the cange in concentration in one of the products or reactents, you can determinethe change in concentation of all the other products an reactants.
a half-cell that consists of a copper wire in 1.00 m cuno3 solution is connected by a salt bridge to a half cell
112 mL of a glucose (C6H12O6) solution is prepared by diluting 8.2 mL of a stock solution of unknown concentration. If the dilute solution contains 0.20 moles of glucose
The standard free energy for the neutralization of HCl with NaOH at 25 degrees celsius is -79.9KJ/mol. Calculate the equilibrium constant for the reaction.
caffeine is a stimulant found in coffee and tea . a solution of caffeine in chloroform as a solvent has a concentration
a metal object with a mass of 19g is heated to 96 degree celcious then transferred to acalorimeter containing 75g of
What is the normal boiling point in of a solution prepared by dissolving 1.50g of aspirin (acetylsalicylic acid, ) in 75.00g of chloroform. The normal boiling point of chloroform is 61.7 degrees C , and for chloroform is 3.63 (degrees C*kg/mol).
Before hydrazine came in to use to remove dissolved oxygen in the water steam boilers, Na2SO3 was usually used for this purpose
To this vessel 8.6787g of Ne are added in such a way that no butane escapes. The total pressure of the vessel (at the same temperature) is 1420 torr. Calculate the volume of the vessel and the mass of the butane.
what is the enthalpy change when 40.1 mL of 0.400 M sulfuric acid reacts with 19.5 mL of 0.133 M potassium hydroxide? H2SO4(aq)+2KOH(aq)->K2SO4(aq)+2H2O(L)
what is the molarity of a solution prepared by combining 125mL of 0.251 molar HCl with 250mL of pure water
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