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How would you prepare 250mL of a buffer having a pH of 3.60 using 0.500M NaOH and 0.500M of HNO2? Would you calculate the molarities of the conjugate acid and base pair and then somehow get the volumes from that? Please explain
You have a sample of bone collected from Nevada and you find that it contains strontium-90 and exhibits an activity of 2.5 Bq. How much strontium-90 was present in the bone when the animal died 45 years ago?(The half-life of 90Sr is 29 years.)
Given the parent compound, draw the mass spectrum fragment that is observed at m/z 91. Include any hydrogen atoms and the charge.
A 0.479 g sample of nitrogen, oxygen or neon gas occupies a volume of 265 mL at 157 kPa and 20?C. What is the molar mass and identity of the gas
What is the maximum concentration of Ba2+ that can be added to a solution containing 1.5 X 10^-2M of F- without precipitating BasF2? Ksp = 1.7 x 10^-6
Which compound is more reactive toward electrophilic substitution e.g nitration? Explain you reasoning.
Calculate the 1)mls of 100mM of NaOH or HCl 2) grams of disodium phosphate 3) and the mls of water required to make a 200mM phosphate buffer at pH 6.85
What is the pKa value of the proton alpha to the phenyl group, and what is the pka value of the proton attached to the carbonyl carbon?
A compound is constituted by mass of 52.1% carbon and 13.1% hydrogen, the rest being oxygen. Given that a volume of 5.33 L of this gas has a mass of 11.5 g at 13 °C and 110 kPa, find the molecular formula for this compound.
calculate the grams of solute needed to prepare each of the following solutions: a)2.00 L of a 5.00 M NaOH solution. b) 325 mL of a .100 M CaCl2 solution. c) 15.0 mL of a .500 M MiNO3 solution.
Estimate the percent change in the volume of a sample of glycerol if it is pressurized
What effect does adding an enzyme to a reaction have on this? On delta G? What are the roles of delta G in biochemical reactions (list two)?
calculate the minimum energy a photon must have to produce an electron hole pair in an extrinsic semiconductor of band gap 1.3 electron volts.
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