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write equations showing how caffeine could be extracted from an organic solvent and subsequently isolated.
A 100. mL sample of 0.200 M aqueous hydrochloric acid is added to 100. mL of 0.200 M aqueous ammonia in a calorimeter whose heat capacity (excluding any water) is 480. J/K. The following reaction occurs when the two solutions are mixed.
A solid sample containing some Fe^2+ ion weighs 1.062 g. It requires 24.12 mL 0.01562 m KNno4 to titrate Fe^2+ in the dissolved sample to a pink end point
Sufficient sodium cyanide, NaCN, was added to 0.015 M silver nitrate, AgNO3, to give a solution that was initially 0.100 M in cyanide ion, CN-. What is the concentration of silver ion,
a buffer composed of .250 mol H2PO4- and .250 mol HPO4^2- diluted with water to a volume of 1.00L. the pH of the buffer is 7.210 how many moles of HCl must be added to decrease the pH to 6.700
A 1.996 gram sample of unknown monoprotic acid is dissolved in some water. This acid solution is then titrated to the end point with 27.38 mL of a solution of 0.4165 M KOH.
For the reaction: H2+ClO2 = 2 HOCl; K=0.0900; what us the concentration of (HOCl), at equilibrium if 0.0230 mol of H2 and 0.0230 mol of ClO2
What are the steps needed in order to calculate the molar mass when given a freezing point depression. Please be as specific as possible.
What is the triple point of material X. Consider melting 3.00 moles of material X at 1.00 atm. Assuming that the melting co-existence curve is a straight line, what is X's normal melting temperature
What mass of Mg is formed by passing a current of 5.50 A through molten MgCl2 for 2.80 days?
calulate the molarity of acetic acid in a venegar sample knowing that 5.00mL of vinegar requires 43.50mL of 0.105 M NaOH to reach the phenolphthalein endpoint in a titration
Draw a six carbon alkyne that can exist as diastereomers. The molecule should only contain only carbon
The use of the British thermal unit (Btu) is common in much enginerring work. (1Btu=1054J). A Btu is the amount of heat required to raise the temperature of 1Ib of water by 1 degree F. How many QUADS of energy does world energy consumption quantit..
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