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Explain the following observations in terms of shifting equilibria by le Chatelier's principle. Write the equation for the equilibrium involved in each case.
a) BaCrO4 is insoluble in basic solution, but dissolves readily in acidic solution.
b) The addition of NaOH to the Fe3+ + SCN-=====FeSCN2+ equilibrium causes color change and a precipitate to appear.
c) The solubility of PbCl2 in .10M HCl is much lower than in pure water.
d) CaC03 is an insoluble salt, but will dissolve in acid.
The decay of radioactive elements follows first-order kinetics. Therefore, the rate of decay can be described by the same integrated rate equations and half-life equations that are used to describe the rate of first-order chemical reactions.
Calculate the solubility of zinc hydroxide, Zn(OH)2, in 1.00 M NaOH. Ksp = 3.0 × 10-16 for Zn(OH)2, Kf = 3.0 × 1015 for Zn(OH)42-
1.if 15.0g of a gas dissolves in 1.00 l of water at 110kpawhat mass will dissolve at 101.325kpa?2.the solubility of an
If the spectrophotometer that was used was miscalibrated so that each absorbance reading was too high by 0.100 units
Carbon-14 has a half-life of 5730 years. A sample of carbon with a mass of 0.120 g has an activity of 40 decays/hr. The initial specific activity is assumed to have been 900 decays/hr/gram. How old is the sample
Identify the charged groups in the peptide shown below at pH=1 and at pH=7. What is the net charge of this peptide at these two pH values? val-met-ser-Ile-phe-arg-cys-tyr-leu
a proposed mechanism for a reaction isc4h9br --gt c4h9 br-slowc4h9 h2o --gt c4h9oh2 fastc4h9oh2 h2o --gt c4h9oh h3o
what is the common IUPAC name for a benzene ring with a single ammonia group (NH3) attached
A 300.0cm^3 sample of the solution is then treated with excess HNO3 and boiled to remove all the dissolved gas. A total of 0.955 L of dry CO2 is collected at 298 K and 0.972 atm.
Given the following equation, how many grams of PbCO3 will dissolve when 5.0 L of 1.50 M H+ is added to 6.00 g of PbCO3
in the reaction a rarr products a is found to be 0.490 m at t72.0 s and 0.474 m at t82.6 s.what is the average rate of
A buffer is formed by mixing 100 mL of 0.1 M NH4Cl with 50 mL of 0.3 M NH3. To this solution 12 mL of 0.1 M NaOH is added. What is the approximate pH of the new solution after neutralization? Assume a Kb of 1.8 × 10^-5 for the weak base.
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