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1. A solution is 0.25 M in each of the cations Ba+2 and Ca+2.
a) What concentration of CrO4-2 is needed to precipitate as much Ba+2 as possible without precipitating the Ca+2? (BaCrO4:Ksp=2.1x10^-10; CaCrO4:Ksp=7.1x10^-4)
b) Remember the concentration of CrO4-2 depends on the acidity of the solution and is governed by the equilibrium:Cr2O7-2(aq) + 3H2O(l) <--> 2CrO4-2(aq) +2H3O+(aq) K=2.5x10^-15
In a 0.25M solution of K2Cr2O7, what pH will give the equilibrium concentration of CrO4-2 calculated above?
For each of the following processes, indicate whether the signs of S and H are expected to be positive, negative, or about zero.
Diamonds are measured in carats where 1 carat= 0.200 g. The density of diamond is 3.51 g/cm^3. What is the volume of a 2.50-carat diamond
Calculate the pH of 100. mL of 0.28 M NH3 before and after the addition of 4.5 g of NH4NO3, and account for the change. Assume that the volume remains constant.
if the molar mass of the hydrocarbon is 126.3 gmol what is the molecular formula of the
particular amino acid in an ion exchange chromatography column. What is the peak width after the amino acid has migrated 100 cm?
At a dosage of 18 micrograms/kilograms body weight, how many milligrams of digitalis should a 180 lb. patient receivec
What mass of NaOH (s) must be added to 1.0 L of 0.050 M NH3 to ensure that the percent ionization of NH3 is no greater than 0.0010%? Assume no volume change on addition of NaOH. Kb NH3=1.8 x10^-5
You obtain the following six measurements for the mass of water delivered by a special calibrated volumetric pipette
What would happen if the buret washed and rinsed properly but not conditioned with sodium hydroxide solution, prior to standardizing the sodium hydroxide solution?
If the melting point of the compound is unknown the melting point measurement could take an exceedingly long time if the rate of heating of 2C/min is followed over the entire range from room temperature to the melting.
1) Identify the compound with the highest wavelength in an UV spectrum. a. benzene b. phenol c. phenolate ion d. aniline e. anilinium ion
Based on the results below, what is the charge of the electron in zorgs ()? Drop # Charge A ?5.1×10?9 B ?1.0×10?8 C ?6.8×10?9 D ?1.36×10?8
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