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The acid dissociation constant (Ka) of caffeineH+ is Ka = 0.25 M. If a cup of tea has a pH of 7.6, what should be the ratio of concentrations of caffeineH+ to unprotonated caffeine in the tea
A 35.00 mL sample of HNO3 solution is neutralized by exactly 42.63 mL of 0.4153 M KOH. What is the molarity of the HNO3 solution?
A beaker with 145mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M
For the equilibrium 2H2S(g) 2H2(g)+S2(g) Kc=9.0x10^-8 at 700 degrees C. The initial concentrations of the three gases are 0.550 M H2S, .550 M H2, and .275 M S2. Determine the equilibrium concentrations of the gases.
An emerald gemstone is an impure form of the mineral beryl, Be3Al2Si16O18. What is the percentage of silicon in the mineral
how many rotational levels are there, approximately, between v=0 and v=1 vibrational levels, which are 559.71 cm-1 apart in energy? B=0.2441 cm-1.
The ball is whirled at a constant rate of three revolutions per second and is released on the upward part of the circular motion when it is 0.75 m above the ground. The ball travels straight upward. In the absence of air resistance, to what maximu..
25.00 mL of a tap water sample is titrated with5.00x10-3 M EDTA solution. 6.25 mL are required to reachthe endpoint. What is the hardness of the water in ppm
A reaction was conducted in benzene as the solvent. Because the reaction was very exothermic, the mixture was cooled in a salt-ice bath. This was a bad choice. Why?
Its undissociated form is red and its anionic form is yellow. What color would a methyl red solution have at pH = 7.0 ? Show your calculations. Hint: Determine the concentration ratio of methyl red and its conjugate.
a baseball weighs 5.19oz. what is teh kinetic energy in joules of this baseball when it is thrown by a major-league pitcher at 95 mph?
Determine the pH of the solution after 1.00 mL of 2.00 M HCl is added to the 100.0 mL solution.
Compound Z has a solubility limit of 32.5 g/L in diethyl ether. Compund Z has a solubility limit od 2.5 g/L in water. You are given a 100 mL aqueous solution that contains 200 mL of compund Z. If you do three 33.3 mL extractions of Z using diethyl..
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