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Phosphoric acid is a triprotic acid (3 acidic hydrogens) with ionization constants as follows: Ka1 = 7.5 x 10^-3 , Ka2 = 6.2 x 10^-8 , Ka3 = 4.2 x 10^-13 . Phosphate buffers with pH values near 2, 7, and 12 can be prepared using the appropriate ‘phosphate' conjugate acid-base pairs. Decide which of the following 2 solutions below you would use in order to prepare a phosphate buffer assigned by your instructor. Which is (12). Predict,using the Henderson-Hasselbalch equation, what this pH should be. A. 0.10 M phosphoric acid (H3PO4) B. 0.10 M sodium dihydrogen phosphate (NaH2PO4; the monobasic salt which contains H2PO4-ions) C. 0.10 M sodium hydrogen phosphate (Na2HPO4; the dibasic salt which contains HPO42-ions D. 0.10 M sodium phosphate (Na3PO4; the tribasic salt which contains PO43-ions)
Consider the electron shell with principle quantum number n = 5. a.) How many subshells are there with n = 5?
Which of the following factors affect the resolution (separation) of two compounds: (A) nature of the stationary phase; (B) eluent composition; (C) amount of sorbent used; (D) color of compounds being separated?
If you know the answer please give units :) Part A: The reactant concentration in a zero-order reaction was 5.00×10^?2M after 140s and 3.00×10^?2M after 300s. What is the rate constant for this reaction? -> For this I got that 1.25x10^-4M/s, whic..
Explain how the mass of a single atom in an element (jn amu), the mass of one mole of atoms of that element
1) Many household cleaning products contain oxalic acid H2C2O4, , a diprotic acid with the following dissociation constants: Ka1=5.9E-2 and Ka2=6.4E-5 Calculate the equilibrium concentration of C2O4^2- in a 0.20 M solution of oxalic acid
Ammonia can be made by reacting calcium cyanamide (CaCN2) with water as shown: CaCN2 + 3 H2O => CaCO3 + 2 NH3.
Fluorine-18, which has a half-life of 110 min, is used in PET scans. (see section 4.5.) If 100 mg of fluorine-18 is shipped at 8 A.M., how many milligrams of the radioisotope are still active if the sample arrives at the radiology laboratory at 1:..
Carbon dioxide makes up approximately 0.04% of the Earth's atmosphere. If you collect a 2.0L sample from the atmosphere at sea level (1.00 atm) on a warm day
MnO2 is oxidized to MnO4 and Cu2 is reduced to Cu . Complete and balance the equation for this reaction in acidic solution. Phases are optional.
calculate the approximate concentration of the solution in mol/kg and determine the volume change of the ballon when it ascends from 1 atm pressure to 240 torr pressure ?
What are the principal natural sources of hydrogen? What are the principal methods for the commercial preparation of hydrogen?
Twenty-five milliliters of liquid nitrogen (density = 0.807g/mL ) is poured into a cylindrical container with a radius of 11.9cm and a length of 17.2cm . The container initially contains only air at a pressure of 760.0mmHG (atmospheric pressure) a..
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