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The titration of 0.02500 L of a diprotic acid solution with 0.1000 M NaOH requires 34.72 mL of titrant to reach the second equivalence point. The pH is 3.95 at the first equialence point and 9.27 at the second equivalence point. If the acid solution contained 0.2015 g of the acid, what is the molar mass, pKa1, and pKa2 of the acid?
Using the van der Waals equation, calculate the pressure of 59.5 g of NH3 in a 5.20 L container at 47°C. The van der Waals constants for NH3 are: a = 4.17 L2xatm/mol2, b = 0.0371 L/mol.
A lactic acid/lactate ion buffer solution contains 0.43M HC3H5O3 and 0.62M C3H5O3^-, respectively. The value of lactic acid is 1.4*10^-4. Calculate the pH of this buffer.
A solution of KOH in ethanol is made up by dissolving 0.335 g KOH in ethanol to form 250.0 mL of solution. Similarly, 1.455 g of C2H5I is dissolved in ethanol to form 250.0 mL of solution.
An equilibrium mixture of SO2, SO3 and O2 gases is maintained in a 11.5 L flask at a temperature at which Kc = 55.2 for the reaction shown below.
Using the appropriate equation from your lecture notes, how much of a 5 gram sample will be extracted from 20mL of water using 15mL of an organic solvent and the partitian coefficient is K = 0.50.(nearest hundredth)
addition of excess NH3 to this acidic solution produces only a blue solution. Which group III ions are present, which are absent and which are in doubt? How would you remove all doubt?
how many grams of sucrose C12H22O11 must be added to 522g of water to give a solution a vapor pressure 2.0mmHg less than that of pure water at 20 degrees celsius
Calculate the hydronium ion concentration and the pH after the addition of 0.25 mL of 0.10 M HCl to each one. What accounts for the difference in the hydronium ion concentrations
A gaseous mixture of O2 and N2 contains 30.8% nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 505mmHg ?
What is the synthesis for the following compunds from simple organic precursors? Make sure the starting sturcutre is a simple organic precursor
How many grams of sodium bromide must be added to 309 grams of water in order to prepare a 0.108 molal sodium bromide solution?
A 2.0 L-reaction flask initially contains 0.04 mol CO, 0.23 mol H2, and 0.60 mol CH3OH (methanol). If this mixture is brought in contact with a zinc oxide-chromium(III) oxide catalyst, the equilibrium shown below is attained.
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