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Suppose you have a solution that might contain any or all of the following cations: Ag , Ba , and Fe . + 2+ 3+ 2 4 When excess HCl is added to this solution a precipitate forms. This precipitate is removed and excess H SO is then added to the solution which forms a precipitate. This precipitate is removed and excess NaOH is added to the supernatant until the solution is strongly basic. The addition of the NaOH does not produce a precipitate. What is the chemical formula of each precipitate? Which of the 3 possible metal cation(s) were not present in the original solution? (explain)
2 Al2O3(s) → 4 Al(s) + 3 O2(g) . ?H = +3339.6 kJ/mol What is ?H for the formation of one mole of Al2O3(s) from the elements?
If the molar enthalpy of water is 6.009 kJ/mol, how much energy is needed for 4.5 moles of ice to melt at STP?
Formic acid (Ka= 1.7 x 10^-4) and sodium formate were used to prepare a buffer solution of pH 4.31. The concentration of the undissociated formic acid in this buffer solution was 0.80 mol/L
Complete this equation to show how hydrofluoric acid, HF, acts as a Brønsted-Lowry acid in water. HF+H2O=?
The reaction between hydrochloric acid and zinc metal produces hydrogen gas and zinc chloride. If 50g of each hydrochloric acid and zinc are mixed
A pound of coffee beans yields 70 cups of coffee (4 cups = 1 qt). How many milliliters of coffee can be obtained from 1.0 g of coffee beans.
The solubility of radium oxalate RaC2O4 in warm water is 0.0174 mols/Liter. Calculate Ksp for this compound. Radium is a 2nd column element somewhere below calcium.
how to determine the number of milliliters of 6.00 M HCl solution would be required to completely react with 65.0 mL of 1.15 M Al(OH)3 solution
calculate the composition of the vapor (in terms of mole fractions) at 25°C. At 25°C, the vapor pressures of pure CH2Cl2 and pure CH2Br2 are 133 and 11.4 torr, respectively.
What volume will carbon dioxide originally 30.0 mL at 27°C have at 77°C
The vapor pressure of chloroform (CHCl3, molar mass 119.5 g/mol) is 4.00 x 10^2 torr at 42.7 C. if 40.0 g of CHCl3 is enclosed in a 10.0 L container, how much liquid CHCl3, if any, will remain in the container
Sodium chloride, NaCl, is a strong electrolyte, as is hydroiodic acid, HI. Write the chemical equations for what happens when these substances are added to water.
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