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Preparing a 10% v/v acetic acid solution
Determine the volume of acetic acid needed to prepare 100 mL of 10% v/v acetic
acid solution in water. Using a pipet, measure out the calculated volume of the acid
and transfer to a dry, clean 100 mL volumetric flask. Add distilled water with swirling
up to the mark.
Preparing a 10% v/v acetic acid solution
Volume of acetic acid= ________________
Calculation:
Preparing a 10% w/v NaCl solution
Determine the amount in grams of NaCl needed to prepare 10% w/v NaCl
solution. Weigh this amount of sodium chloride in a 50 mL beaker. Add about 30
mL distilled water and stir. Once the sodium chloride has dissolved completely, pour
it into a 100 mL volumetric flask. Add distilled water up to the mark to bring the
volume to 100 ml. Mix thoroughly. Caution: Do not simply measure 100ml of water
and add 10g of sodium chloride. This will introduce error because adding the solid
will change the final volume of the solution and throw off the final percentage.
Preparing a 10% w/v NaCl solution
Grams of NaCl = _______________
Calculation:
A bottle with a total volume of 1 L was filled halfway with a solution of 1,1,1- trichloroethane (initial concentration: 100 mg/L) and closed. Calculate the equilibrium concentrations of 1,1,1-trichloroethane at 20 °C in the gas and aqueous phase using H=0.078 mol/(L bar) and R= 0.081345 (bar L)/(mol K). Chlorofluorocarbon (CFC) βw=Kc βg = 1.9 ∙34.48 mg L β =65.51 mg/L
What is the solubility in (mg/l)of oxygen(M=32g/mol) at 25 degrees celcius? The atmosphere contains 20.9 vol% oxygen. The total atmospheric pressure is assumed to be 1bar and Henry's constant at 25 degrees celcius is 1.247*10^-3mol/l
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The vapor pressure of pure water at 85oC is 434 torr. The vapor pressure at 850C of a solution prepared from 100 mL of water (density 1.00 g/mL) and 150 g of diglyme, C6H1403, a nonvolatile substance is 361 torr
what are the polarity of solutes and solvents?
(A) If X is “not radioactive,” its half-life is essentially zero.
(B) If A has a half-life of 10 years, and X has a half-life of 10,000 years, A would be more suitable radioscope to measure processes occurring on the 40-year time scale.
A galvanic cell consists of a chromium, Cr bar in a chromic sulfate solution, Cr2(SO4)3 containing 13 g and a silver, Ag bar in a silver sulfate solution (Ag2SO4 ) containing 37.8 g in a
3 L solution and a sodium sulfate solution use as a salt bridge solution. The silver electrode is positive relative to the chromium electrode. Write the cell half- reactions, overall reaction and cell notation. Calculate the following:
A) Gibbs Free – Energy B) Electrode potential of the cell.
(Note: when calculating the molarity do not include the spectator ions)
Derive an expression for the compression factor of a gas that obeys the equation of state p(V − nb) = nRT, where b and R are constants. If the pressure and temperature are such that Vm = 10b, what is the numerical value of the compression factor?
