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A 5.0 g piece of potassium metal is tossed in 150 mL of water held in an insulated container. The potassium reacts with some of the water, producing potassium hydroxide and hydrogen gas. a) Given the following information, determine the temperature of the resulting solution of potassium hydroxide? The starting temperature of both the potassium metal and the water was 20.0°C. The heat capacity of water is 4.18 J/g-deg. You may assume that resulting solution of potassium hydroxide has the same heat capacity as that of pure water. The molecular weight of K is 39.1 g/mol b) Would you expect ΔE° to be the same as ΔH° for this reaction? Explain.
explain why the pure solvent shows a level horizontal curve as solidification occurs but the curve for the solution
It takes 27.22 mL of NaOH to reach the endpoint. What is the equivalent weight of the acid?
Driving across Death Valley
Calculate the hydrogen-ion concentration [H+] for the aqueous solution in which [OH-] is 1 x 10-11 mol/L. Is this solution acididc, basic, or neutral? Show your work.
Why is it possible to separate the product (6-ethoxycarbonyl-3,5-diphenyl-2-cyclohexenone) from sodium hydroxide using acetone?
An unknown Cu2+ sample gave an absorbance of 0.262 in an atomic absorption analysis. Then 1.00 ml of solution containing 100.0 ppm Cu2+ was mixed with 95.0 ml of the unknown, and mixture was diluted to 100.0 ml in a volumetric flask.
sodium carbonate is a reagent that may be used to standardize acids and bases in the same way that you have used khp in
Calculate the concentrations of all species in a 1.75 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10-2 and Ka2 = 6.3× 10-8.
We all know that a day at the beach leaves us worn-out. Assuming our body looses its heat energy to the water, and on a typical day of swimming at the beach we encounter 135.0kL of water at a constant Temperature. How much energy are we loosing to..
what is the concentration (in mole/L or M) of Cu2+ and NO3 in the final solution. Remember your significant figures. B) If there is an impurity of Cu2+ in the water you are using to perform the dilutions
calculate the standard entropy of propane gas at 231.04k given the following data hfusion842.2 calmol at mp 84.45k
suppose the condenser operates as a total condenser at 40 degrees, the production rate of the overhead product is 75kmol/h. The ratio of reflux and overhead product is 1.5:1.
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