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Calculate the masses of a) Ca(NO3)2 and, separately, b) NaCl to add to a 0.150 mol kg-1 solution of KNO3(aq) containing 500g of solvent to raise its ionic strength to 0.250.
The sedimentation coefficient of a certain DNA in 1 M NaCl at 20 oC was measured by boundary sedimentation at 24,630 rpm. The following data were recorded time (min) distance (cm) 16 6.2687 32 6.3507 48 6.4380 64 6.5174 80 6.6047 96 6.6814 A.
As the reaction proceeds, the specific rotation eventually drops to zero. Further analysis shows that the specific rotation falls to zero after half of the radioactive iodine has been consumed. Explain this observation
How many grams of dry NH4Cl need to be added to 2.30L of a 0.800 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.83? Kb for ammonia is 1.8 * times 10^-5
using the heats of vaporization for at 25 44.02 at 100 40.67 calculate the entropy change for the vaporization of
Solid Ba(MNO4)2 is in equilibrium in a solution of KMNO4. What concentration of KMNO4 is needed to establish a concentration of 2.0 x 10-8 for the Ba 2+ ion in solution?
Write an equation showing how this buffer neutralizes added acid HI. Write an equation showing how this buffer neutralizes added acid Ba(OH)2
what is the mole fraction of ethanol, C2H5OH, in a solution of 47.5 grams of C2H5OH in 85 grams of water
Calculate the total volume of gas (at 133 degrees C and 758 mmHg) produced by the complete decomposition of 1.56 kg of ammonium nitrate.
If a 45.6-g sample that is 98.5% K2Cr2O7 by mass is allowed to react with 305 ml of HCl with a density of 1.15 g/ml and 30.1 % by mass, how many grams of Cl2 are produced
The 100.0mL sample was treated with a molybdate reagent that precipitates ammonium phosphomolybdate, (NH4)3 [P(Mo12O40)] x 12H2O. This substance was dried at 110 degree C to remove waters of hydration and heated to 400 degree C until it reached a ..
One of the product formed when 5-hexen-1-ol is treated with a catalytic amount of sulfuric acid is a cyclic ether
Thiosulfate was used to mask the copper in a 20.00 mL aliquot. Titration of the lead and zinc in this aliquot required 34.06 mL of the EDTA solution. Finally, cyanide was used to mask the copper and the zinc in a 25.00 mL aliquot. Titration of the..
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