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A solution contains one or more of the following ions: Pb 2+, Ca 2+, and Zn 2+. When sodium chloride is added to the solution, a precipitate forms. The precipitate is filtered off and sodium sulfate is added to the solution, but no percipitate forms. When sodium carbonate is added to the soultion, however, a precipitate forms. Which ions were present in the original solution? What are the net ionic equations for each reaction that occured?
A stock solution is prepared by adding 22 mL of 1 M Na3PO4 to enough water to make 73 mL. What is the PO43- concentration of 30 mL of the stock solution?
Calculate the equilibrium concentration of Ag+ under these conditions.Ksp for Ag2CO3 is 8.1 x 10-12. Ag2CO3(s, excess)2Ag+(aq) + CO3-2(aq)
What mass of C4H6 in grams is consumed in the reaction below when 39.8 grams O2 (g) are also consumed? C4H6 (g) + O2 (g) ' CO2 (g) + H2O (g) (not balanced)
What is the change in pH after addition of 10.0 mL of 1.0 sodium hydroxide to 90.0 mL of a 1.0 M NH3/1.0 M NH4+ buffer? [ Kb for ammonia is 1.8 x 10^-5]?
Can someone please provide both a CNMR and HNMR interpretation table for secbutylbenzene WITH labeled structures for each?
A closed vessel contains moist air at 20 degree celcius, the relative humidity being 30 %. What would be the relative humidity become if the vessel were cooled to 10 degree celcius?
What is the theoretical yield of aspirin if 153 kg of salicylic acid is allowed to react with 179 kg of acetic anhydride?
What is the emf for this cell when [Fe3+] = 0.50M, PH2 = 0.25 atm, [Fe2+] = 0.010M and the pH in both compartments is 4.00
A goose is flying south for the winter at a constant speed. Keep in mind that one mile is 1.61 , and one pound is 454 .The goose has a mass of 20.1
Calculate the [H3O+], pH, and the fraction of dissociation (α) in an aqueous 0.140 M NH3 solution. (Hint: You will need the Ka, located in the back of your textbook.)
A sample containing 0.187 g Cl- is dissolved in 50.0 mL water. How many moles of Cl- ion are in the solution? What is the molarity of Cl- ion in the solution?
The speed of sound in air is 344 m/s at room temperature. The lowest frequency of a large organ pipe is 30 s-1 and the highest frequency of a piccolo is 1.5 x 104 s-1. Find the difference in wavelength between these two sounds.
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