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1. You wish to prepare an HC2H3O2 buffer with a pH of 5.44. If the pKa of this is 4.74, what ratio of C2H3O2-/HC2H3O2 must you use?
2. Calculate the pH of a buffer that is 0.058 M HF and 0.058 M LiF. The Ka for HF is 3.5 x 10^-4
3. Calculate the pH of a buffer that is 0.158 M HClO and 0.099 M NaClO. The Ka for HClO is 2.9 x 10^-8.
4. Calculate the pH of a buffer that is 0.105 M HC2H3O2 and 0.146 M KC2H3O2. The Ka for HC2H3O2 is 1.8 x 10^-5
Explain why lattice energy calculations based on the born mayer equation reproduce the experimentally determined values to within 1 percent for LiCl but only 10 percent for AgCl given that both compounds have the rock salt structure
When 1.00 g of urea (CO(NH2)2) is dissolved in 200g of solvent A, the freezing point is lowered by 0.250C. When 1.50 g of the nonelectrolyte Y is dissolved in 125 g of the same solvent
If 66.5 ml of base is required to reach the second equivalence point, what is the concentration of the acid?
What statement below best describes the graph representing the integrated 1st order rate law. plot of ln[a] vs t having a straight line negative slope equal to -k
What mass of C4H6 in grams is consumed in the reaction below when 36.9 grams O2 (g) are also consumed?
A volume of 25.0 mL of 0.100 M C6H5CO2H(aq) is titrated with 0.100 M NaOH(aq). What is the pH after the addition of 12.5 mL of NaOH. (Ka of benzoic acid = 6.3 ´ 10-5)
A 4.867 g sample of a monoprotic acid was dissolved in water. It took 30.24 mL of a 0.1578 M NaOH solution to neutralize the acid. Calculate the molar mass of the acid.
A welder uses 20 gallons of gaseous acctylene (C2H4). What volume of O2 gas measured at the same conditions is consumed Given the following equation
for a first-order reaction. at 750 k 15 of a sample of cyclopropane changes to propene in 6.8 minutes. what is the
a solution formed by dissolving 166.6 grams of common table sugar in 686.2 ml of h2o. compute the vapor pressure at 25
If you have 375 molecules in a 10^-4 dilution, how many molecules were in the original solution
Q 3: The salt NaBrO(3) oxides Sn^2+ to SnCl(6)^2- in the presence of hydrochloric acid according to the equation
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