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a) What is the ph of a buffer prepared by mixing 5.0 g of ammonia (NH3) and 20.0 f of ammonium chloride (NH4Cl) in enough water to form 2.50 L of solution. The Kb of ammonia is 1.76*10^-5.
b) How many moles of sodium hypobromite, NaBrO, should be added to 1.00 L of 0.050M hypobromous acid, HBrO, to form a buffer solution of ph 8.80? assume no volume change when NaBrO is added. Ka of HBrO is 2.50*10^-9.
c) How many grams of sodium lactate, NaC3H5O3, should be added to 1.00 L of 0.150M lactic acid, HC3H5O3 to form a buffer solution with a ph of 3.90? Assume no volume change when the sodium lactate is added. ka of lactic acid is 1.40*10^-4.
For your most exact titration, record the following: (a) Volume of NaOH solution in the burette at the start (mL): (b) Volume of NaOH solution in the burette at the end (mL):
1. the equation for a beers law plot is y 2012.5x 0.003. if the recorded absorbance for an equilibrium mixture is
A buffer solution is prepared by dissolving 0.075 moles of HOBr and 0.075 moles of NaOBr in 500mL of solution. Calculate the pH of this buffer. (HOBr: Ka = 2.4 * 10^-9)
Illustrate the retrosynthetic analysis and write the reactions required to synthesize the following compound
An unknown compound contains only carbon, hydrogen, and oxygen (). Combustion of 4.00 of this compound produced 5.87 of carbon dioxide and 2.40 of water.
Carbonyl fluoride, \rm COF_2, is an important intermediate used in the production of fluorine-containing compounds.
An extraction procedure specifies that an aqeuous solution containing dissoloved organic material be extracted twice with 10mL portions of diethyl ether.
Calculate the pH of the buffer after the addition of 1.5 g of HCl (36.5 g/mol). (Ka of HNO2 = 7.1x10^-4.)
After combining the hexane extracts as well as evaporating the hexane he had 0.49 g of crystals. Explain what is the theoretical yield and percent recovery
The overall free energy change to transport one mol of K+1 ion from the outside of a cell (where its concentration is 4 mM) to the inside (where its concentration is 0.5 mM), is -13.08 kJ/mol. What is the trans membrane potential (at 37 Celsius)?
Explain the titration requires 32.75 ml of the standardized NaOH solution to reach the endpoint. Explain what is the molar concentration of the hydrochloric acid solution
An aqueous solution containing 5.85g of an optically pure compound was diluted to 800.0mL with water and placed in a polarimeter tube 10.0cm long. The measured rotation was -5.93degrees at 25degrees C. Calculate the specific rotation of the compou..
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