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Assume we have a solution that contains 0.050 mol/L of Ba^2+ and 0.050 mol/L Mg^2+. Calculate the concentration of Ba+ left in solution at the point that Mg+ just begins to precipitate. Assume the solution volume (and thus the ion concentrations) do not change as we add carbonate ion. The Ksp for Barium is 8.1 X 10^ -9 and the Ksp for Magnesium carbonate is 4.0 X 10^ -5. Write balanced chemical equations and Ksp expressions for each of the salts as part of your solution.
Which of the following intermediates is believed to occur in the mechanism by which alkenes are hydrated in the presence of acid?
How many total moles of ions are released when the following sample dissolves completely in water? 7.24x 10^20 formula units of NiCl2.
Calculate the number of molecules inside the cell, which is 3.6um long and 1.2 um in diameter.
The minimum frequency of light needed to eject electrons from a metal is called the threshold and find the minimum energy needed to eject electrons from a metal with a threshold frequency of 3.27*10^14s^-1.
Draw the Lewis structure for each of the following molecules or ions, and predict their electron-domain and molecular geometries.
An experiment requires 44.0 of ethylene glycol, a liquid whose density is 1.114 . Rather than weigh the sample on a balance, a chemist chooses to dispense the liquid using a graduated cylinder. What volume of the liquid should he use?
You have a volume of 100 L at a concentration of 100 PPM of benzene. If you later sampled from this known concentration at a temperature of 15° C
In which conversion is an oxidizing agent required? a. CH3CH2CH2CH3
How many grams of dry NH4Cl need to be added to 2.10 L of a 0.500 M solution of ammonia, NH3 , to prepare a buffer solution that has a pH of 8.76? Kb for ammonia is 1.8*10 ^-5.
Calculate the standard reduction potential for the X half-reaction. The standard reduction potential of the copper half-reaction is 0.52 V. (Hint, write the half-reactions and the overall chemical equation for the spontaneous reaction.)
when mixture A at 273 K is heated to 473 K, mixture B results. How many different chemical changes occur? How many different physical changes occur?
the delta H OF vaporization for a new substance is 45 kj/mol and its delta H sublimation is 62 kj/mol, how much energy is needed for freezing 2.75 mol of a substance
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