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Important information about Extraction of caffeine from tea
At 25 degrees C, 1.0 gram of caffeine will dissolve in 47 ml of water, in 8.1 ml's of chloroform, in 86 ml of benzene, or in 370 of diethyl ether. Calculate the partition coefficient of caffeine between water and each of the other three solvents. Which of these three organic solvents would be the best choice for extracting caffeine from an aqueous solution?
Calculate the molar solubility of Cu(OH)2, Ksp = 2.2 × 10-20, in 0.82 M NH3. Don't forget to use the complexation reaction Cu2+ + 4 NH3 ? Cu(NH3)42+, K = 5.0 × 1013.
Draw the enantiomer of proline which would give rise to the absolute stereochemistry and draw a proposed catalytic cycle for the transformation and how does the catalyst activate the substrate
Give explanation why it is not practical to evaluate the solubility of the two salts AX and BY2, by simply comparing the solubility product constants?
Consider a glass of 254 mL of water at 25°C. Calculate the mass of ice at -15°C that must be added to cool the water to 10°C after thermal equilibrium is achieved.
Calculate w (in kJ) when 376 g iron (III) oxide (MM = 159.7 g/mol) reacts with excess carbon to produce carbon dioxide gas at 335 K:
In the welding shop of the XYZ Manufacturing plant you have a cylinder with a volume of 548L of a compressed gas, and the pressure gauge shows 238 psig at the room temperature 25 C.
Calculating the Moles of Aspirin, The molecular formula for aspirin is HC9H7O4, Calculate the molecular weight for aspirin
A 275-g sample of nickel at 100.0C is placed in 100.0 mL of water at 22.0C. What is the final temperature of the water.
At a certain temperature, the Kp for the decomposition of H2S is 0.726 H2S = H2+S initally only H2S is present at a pressure of 0.126 atm in a closed container.
A 155 mL sample of rainwater is titrated using 0.0095 M NaOH solution. If 4.8 mL of the NaOH solution was required to reach the endpoint, what was the pH of the rainwater?
Calculate the pH of a solution when 0.200 moles of solid NaOH is added to 2.00 liter of 0.250 M HCl. Assume no change in volume.
You have 16 electrons, 16 protons, and 16 neutrons. You can combine them to make 8 Helium (He-4) atoms, 4 beryllium atoms (Be-8), 2 oxygen atoms (O-16), or one sulfur atom (S-32).
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