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1. Why is NaHCO? added to the freshly brewed tea, prior to extraction with CH?Cl?? 2. If an intractable emulsion is produced during extraction of caffeine, how might you attempt to break up the emulsion? 3. What is the role of CaCl? in this experiment? 4. How would you determine if you have used enough drying agent for drying an organic layer containing the desired component?
Consider a small lake, 0.4 mile across and 11 ft deep, that contains a total of 50 tons of dissolved oxygen. Calculate the BOD (i.e. calculate the amount of oxygen required to degrade the amount of organic waste given)
calculate the maximum volume in mL of .15 M HCl that each of the following antacid formations would be expected to neutralize. Assume complete neutralization.
The earth uses 15 tettrawatts of power Sunlight striking the earth provides 1.336kw per square meter. The surface area of the earth is 197,000,000 square miles.
What mass of sodium nitrite must be added to 350 mL of water to give a solution with a pH
You are carrying out tlc with a mixture of two compounds A and B. A is less polar than B. On a REVERSE PHASE plate
At 1 atm, how many moles of CO_2 are released by raising the temperature of 1 liter of water from 20 celcius to 25 celcius
Calculate the molarity of a solution made by adding 27.8 mL of concentrated hydrochloric acid (37.3 % by mass, density 1.19 g/mL) to some water in a volumetric flask, then adding water
Determine the subunit composition of this protein from the following information: 10 points Molecular mass of the native proteinby gel filtration is 300 kD Molecular mass by SDS-PAGE
If the flask has a volume of 0.500 L, what is the minimum mass of PH3BCl3(s) that must be added to the flask in order to achieve equilibrium
Describe how biological membranes are organized: what roles do lipids and proteins play in this organization
What observed rotation is expected when 1.58M solution of (R)-2-butanol is mixed with an equal volume of a 0.790 M solution of racemic 2-butanol, and the resulting solution is analyzed in a sampling container that is 1 dm long
Lindane is a toxic insecticide that causes dizziness and diarrhea in humans. Find the molecular formula for lindane given its percent composition:
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