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When using a solvent mixture for recrystallization, how can you obtain the correct mixture? a. use an equal mix of the solvents b. dissolve the compound in the poorer solvent and then add the better solvent dropwise until the compound recrystallizes c. Dissolve the compound in the better solvent at just above freezing point and then add boiling portions of the poor solvent in 5mL increments until recrystallization is complete d. Dissolve the compound in the better solvent and then add the poor solvent dropwise to saturate the solution.
A 320. mL air sample collected at 35°C has a pressure of 550. torr. What pressure will the air exert if it is allowed to expand to 425 mL at 59°C?
What molar ratio of sodium acetate to acetic acid (NaAc/HAc) should be used in preparing a buffer having a pH of 4.35? (Ka = 1.8×10-5 for acetic acid.)
The chiral carboxylic acid A (C5H6O2) reacts with 1 mol of hydrogen gas on catalytic hydrogenation. The product is an achiral carboxylic acid B (C5H8O2). What are the structures of Compounds A and B?
The temperature of the calorimeter plus contents increased from 21.12°C to 29.85°C. What is the heat of combustion per gram of octane? What is the heat of combustion per mole of octane?
Method for Trapping a Gas, The decomposition of 3-sulfolene to form 1,3-butadiene generates 1 mole of sulfur dioxide gas per mole of 1,3-butadiene. Substantial quantities of SO2 would be generated if this decomposition were carried out on a large ..
Calculate the freezing point of 0.15m calcium chloride aqueous solution. Assume that the molal freezing point depression constant
if you have 370 ml of water at 25 degrees Celcius and 130mL of water at 95 degrees C. what is the final temperatue of the mixture?
Provide the structure of an aromatic compound with seven carbon atoms. Draw the molecule on the canvas by choosing buttons from the Tools (for bonds)
suppose the actual yield is 7.52 of CH3OH. what is the % yield?
What is the smallest possible integer coefficient of S in the combined balanced equation and compute the final pressure in the tank if nothing else is altered in the surroundings.
The hydrogen carbonate ion can act as both an acid and a base. Write out two equations which demonstrate this and calculate (or look up) the equilibrium constants for both expressions
How many grams of solid sodium phosphate, Na3PO4, are needed to prepare exactly 250ml of a 0.500M Na+ solution?
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