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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?
Describe in general terms the steps involved in the automated synthesis of the DNA sequence ATG
The half-life for a first order reaction at 550 oC is 85 sec. How long it would take for 23% of the reactant to decompose?
Without doing a calculation, which of the bonds below would you expect to have the higher stretching frequency. C-O or C=O
Equal volumes of 0.1 M solutions of KOH and HNO3 are mixed. What is the pH of the resulting solution
The Ka for H2PO4 is 6.3 x 10-8. The Ka for Hs- is 1.3x10-13. Both are amphoteric substances. What does amphoteric mean? Use 2 PO4- to illustrate the definition
Which element formed, according to the theory of the Big bang, before the first generation of galaxies formed
For the reaction 2HCl + Na2CO3 to 2NaCl + H2O + CO2 what volume of 0.45 M HCl solution would be needed to produce 2.5 L of CO2 at STP?
how many grams of solute are in the solution 498 mL of a.850 M Na2So4?
When butane gas, C4H10, burns in oxygen gas, O2, to form carbon dioxide gas, CO2, and gaseous water, 2845 kJ of thermal energy is evolved per mole of butane burned.
If the heat of combustion for a specific compound is -1100.0 kJ/mol and its molar mass is 75.49 g/mol, how many grams of this compound must you burn to release 390.70 kJ of heat
a 1.0 microl sample of an equal volume mixture of 2-pentanone and 1-nitropropane is injected into a gas chromatograph.
Hydration of alkynes (via oxymercuration) gives good yields of single compounds only with symmetrical or terminal alkynes. Draw the major organic product(s) formed when hex-2-yne undergoes hydration in the presence of HgSO4 and H2SO4.
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