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A 24-hour urine specimen was diluted to 2.000 L. After the solution was buffered to pH 10, a 10.00-mL aliquot was titrated with 27.32 mL of 0.003960 M EDTA. The calcium in a second 10.00-mL aliquot was isolated as CaC2O4(s) redissolved in acid, and titrated with 12.21 mL of the EDTA solution. Assuming that 15 to 300 mg of magnesium and 50 to 400 mg calcium per day are normal, did this specimen fall within these ranges?
Calculate the nonstandard emf for each of the following reactions if the concentration of each of the ions in these reactions is 0.0004 molar and everything else is standard (use 298 K for the temperature, R = 8.314 J/mol-K, and F = 96,485 C/mol)
Give the number of valence electrons of each element and draw the Lewis structure for each molecule.
a solution is prepared by dissolving 396 grams of sucrose in 624 grams of water. what is the vapor pressure of this solution at 30 degrees celsius.
A solution containing the two compounds exhibits absorbances (using a 1.00cm cell) of 0.726 and 0.544 at 267 and 312nm, respectively. What are the concentrations of A and B in mg/mL? Note: The aborptivity values are given in units of L/g.cm.
Calculate (a) the work done when the gas expands isothermally against a constant external pressure of 200 Torr until its volume has increased by 3.6 dm3, and (b) the work that would be done if the same expansion had occurred reversibly.
How many grams of water can be cooled from 36 degrees celsius to 23 degrees celsius by the evaporation of 53g of water.
At 9.°C and 1.40 atm pressure, a sample of helium gas occupies a volume of 5.10 L. The sample is compressed and heated to 60.°C. Calculate the final pressure of the sample, if the final volume is 3.64 L.
calculate the ph of soultion prepared by adding20.0ml of 0.100m hcl to 80.0ml of a buffer that is comprised pf 0.25 M NH2NH2
A sample of molten iron occupies of a volume of 7.11 x 10-3 L. If the density of iron is 7.86 g/cm3, what is the mass of iron in grams in the sample?
isolate two of three compouds given 1,2,4,5- tetrachlorobenze, o-toluic acid and 1,4-dibromobenzene
If 114 grams of CS2 are burned in an excess of O2 (an amount sufficient to burn completely all 114 g of CS2), how many moles of SO2 are formed?
Explain why the salt of a weak acid, as well as the acid itself, must be present to form a bu?er solution.
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