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What is the pH of a solution that results from adding 25 mL of 0.50 M NaOH to 75 mL of 0.50 M CH3CO2H? (Ka of CH3CO2H = 1.8 E 10-5
what is the concentration of (HOCl), at equilibrium if 0.0230 mol of H2 and 0.0230 mol of ClO2 are initially placed in a 5 L vessel? What is the concentration of ClO2 in the above problem at equilibrium?
10 logarithmic scale of hydrogen ion concentration Be careful If pH = -log [H+ ], what does [H+ ] equal? If the pH of an aqueous solution is 3.50 at 25 C, what is the hydroxide ion concentration?
What is the change in internal energy (in J) of a system that absorbs 0.603 kj of heat from its surroundings and has 0.903 kcal of work done on it
What is the normal boiling point of 4.62 m aqueous solution of LiNO3? Kb of water is 0.51 degree C / cm. Also if the same problem but asking for freezing point would the problem be the same?
Explain the following observations. Use diagrams where possible and/or necessary, to aid your explanations:
What minimum volume of 14.0M hydrochloric acid would be required to completely dissolve a 700.0g iron bar
a mixture of Phe (pI 5.5), Thr (pI 6.5), Asp (pI 3.0), His (pI 7.6), and Lys (pI 9.8) at pH 9.8 is loaded on an anion-exchange column and then eluted with a pH gradient of lowering pH. what order will the aminoo acids elute? Explain.
In an experiment, 2.50 g salicycylic acid was reacted with excess acetic anhydride to synthesize aspirin, as shown below.
The molar volume of Al2O3 at 25°C and 1 atm is 25.715 cc/mole. Its coefficient of thermal expansion is 26·10-6 K-1 and the coefficient of compressibility is 8.0·10-7 atm. Estimate the molar volume of Al2O3 at 400°C and 10 kilobars pressure.
What are the proper names for each of the pieces of glassware commonly used in distillation. In distillation, how is a column different than a condenser? How is a fractionating column different than a plain column
The pH of 0.5 M formic acic, HCOOH, is 2.02. Calculate the difference in pH when 6.42 g of HCOONa is added to 390.9 mL of 0.50 M formic acid. Ignore any changes in volume.
it was necessary to measure the volume of the sample. The diameter of the cylinder was 23.0 mm and the length of the cylinder was 38.9 mm. What was the volume of the aluminum cylinder in cm3?
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