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Directions:
"Refer back to equation (2), and consider carefully whether you could simply have used the pH value of the solution at the very beginning of the titration, before any base had been added, to determine either or both the molar mass and the Ka value. Which of the following is the best conclusion:"
The second equation was:
Ka = (H3O+) (A-) / (HA)
A. The initial solution pH depend on both the Ka and the concentration of the weak acid, so measuring the initial pH is insufficient to determine both these solutions.
B. The initial solution pH depend on both the Ka and the concentration of the weak acid, so measuring the initial pH very accurately may be sufficient to determine both these unknowns.
During an experiment, a student adds .339 g of calcium metal to 100.0 mL of 2.05 M HCl. The student observes a temperature increase of 11.0 °C for the solution. Assuming the solution\'s final volume is 100.0 mL,
began with 81.0 mmol of isopentyl alcohol, how many grams of isopentyl acetate could you theoretically produced assuming only 65.0% attainable yield?
Carbon dioxide dissolves in water to form carbonic acid. Estimate the thermodynamic equilibrium constanst (K) for this reaction (delta Gf values: H2CO3= - 616.1, H2O= - 237.1, CO2= - 394.4) .
Draw all products of the reactions of 4-Chloro-2-methylpentane with NaCN and AgCN. Identify the reaction mechanisms and draw resonance structures
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Calculate the pH of the following: the solution prepared by mixing 25.00mL of 0.100M malonic acid with 15.00mL of 0.16667M NaOH (Ka1 = 1.24x10 -3. Ka2 = 2.01x10 -6)
Calculate the amount of heat (in kJ) required to convert 74.6 g of water to steam at 100ºC. (Specific heat of water = 4.184 J/g • ºC; ?Hfus (H2O) = 6.01 kJ/mol; ?Hvap (H2O) = 40.79 kJ/mol).
Question- Calculate the change in internal energy of the following system: a balloon is cooled by removing 0.657kJ of heat. It shrinks on cooling, and the atmosphere does 382J of work on the balloon.
How many grams of pure solid PbCl2 could be formed from the reaction of 5.176 g of lead with excess HCl?
If you eat a 48 g serving rice every fourth day and you weigh 75 kg, what is your dose of inorganic arsenic (in µg per kg body weight per day) if the rice contains 386 µg kg-1of total arsenic, 45% of which is inorganic arsenic.
The dissociation energy for N2 is 9.76 eV. Light of energy21.23 eV cause N2 to emit photoelectrons, the most energetic of which have kinetic energy of 5.42 eV. The energy required to ionize a nitrogen atom is 14.53 eV. Approximate the dissociation..
The quantity of antimony in an ore can be determined by an oxidation - reduction titration with an oxidizing agent. The ore is dissolved in hot, concentrated acid and passed over a reducing agent so that all the antimony
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