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A 50 mL sample of 0.06M HC3H5O2 (propanoic acid) is titrated with 20 mL of 0.07M NaOH. What is the pH at this point of the titration? (Ka of HC3H5O2 = 1.3*10^-5)
A compound of carbon and hydrogen contains 80% carbon by mass. What is the mole ratio of carbon to hydrogen in this compound
Calculate the P-Cl bond energy, given the following reaction and the average bond dissociation energy of chlorine as 240kJ/mole.
Which pair is written with the first member having the higher boiling point?
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.
.914g sample of stannous flouride gives a 1,078g precipitate of stannous phosphate. calculate the theoretcial yeild?
When a rod of metallic lead was added to a 0.0100M solution of Co^+3, it was found that 68% of the cobalt in solution was reduced to Co^+2 by the lead. Find the value of K for Pb + 2Co^+3 = Pb^+2 + 2Co^+2
what is the molar mass of the unknown liquid in g/mole?
alcohol is often used to sterilize medical instruments or patch of skin
A mixture of amino acids is subjected to paper electrophoresis at pH 6.0. The amino acids present in the mixture are Val, Glu, Phe, Ser, and Lys. Which amino acids will migrate toward the cathode? Toward the anode? Explain.
Although there are a great variety of lipid structures, most lipids contain: A) A large hydrocarbon portion and no polar groups B) A large hydrocarbon portion and a few polar groups
A 0.150-mole quantity of CoCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Co2 ions at equilibrium? Assume the formation constant of Co(NH3)62 is 5.0× 1031.
Show mathematically that addition of a common ion will decrease the ionization of a weak acid OR a weak base
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