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Calculate the pH of the 0.20 M NH/0.26 M NHCl buffer. What is the pH after the addition of 20.0 mL of 0.050 M NaOH to 90.0 mL of the buffer solution? The Kb of ammonia is 1.8 x 10-5.
Calculate the mass(in grams) of solids you must measure out to prepare 100 mL each of 0.025 M CuSO4, 0.025 M Ca(NO3)2, 0.025 M Al(NO3)3, and 0.025 M KCl.
When some ionic compounds dissolve, not all of their bonds dissociate. What kind of conductivity would you expect such a solution to have?
In most instrumental or analytical methods, use of an Internal Standard is considered the least desirable approach for calibrating the method
Suppose that a solution is 4.5×10?2 in calcium chloride and 9.5×10?2 in magnesium nitrate. What mass of sodium phosphate would have to be added to 1.5 of this solution to completely eliminate the hard water ions. Assume complete reaction.
A stock solution is prepared by adding 24 mL of 0.4 M Na3PO4 to enough water to make 79 mL. What is the PO43- concentration of 25 mL of the stock solution?
Calculate the molarity of 500.0 cm3 of solution containing 18.5 g of calcium nitrate Ca(NO3)2
A 32.0-g sample of water at 260. K is mixed with 47.0 g water at 300. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
What is the activation energy for a reaction whose rate is tripled by a temperature increase from 22.5°C to 58.0°C?
How much heat is required to vaporize 351 g of liquid ethanol at its boiling point.
What is the condensed structure of ibuprofen and names of the functional groups present in molecule
A 50 mL sample of 0.5 M HCl is titrated with 0.5 M NaOH. What is the pH of the solution after 28 mL of NaOH have been added to the acid
Reactivity of monosaccharides. Give the fate (what happens to) an aldose monosaccharide in the presence of a weak oxidizing reagent (oxidation reaction). Give the fate of (what happens to) a ketose monosaccharide in the presence of H2 and a Pt cat..
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