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Pyridine (C5H5N) is a weak base (pkb = 8.74) with an unpleasant, sweet fishy odour. In a titration, 175.0mL of pyridine solution required 13.6 mL of 0.3250M HCl to reach the equivalence point.
a) Calculate the pH of the solution at the equivalence point of the titration.
b) Sketch the shape of the pH curve you would obtain for this titration, and label all characteristic features of the graph.
Assuming the mixture has the same specific heat (4.184J/goC) and density (1.00 g/cm3) as water, calculate the heat (in J) transferred to the surroundings, qsurr.
2mgo2---2mgoratekmgo221. what is the overall reaction order?2. what are the units of the rate constant k for
A 0.100- sample of your favorite candy is burned in a calorimeter that contains 1.00 of water initially at 24.0. After the candy is burned, the water temperature is 34.0.
calcuate the wavelength (in nanometers) of an electron weighing 9.10939x10^-28g moving at 3.90x10^6 m/s.
Calculate [w] when the gas is allowed to expand reversibly to 1 bar pressure a) isothermically and b) adiabatically.
A solution of selenium-75, a radioisotope used in the diagnosis of pancreatic disease, is found just prior to administration to have an activity of 44 uCi/mL. How many milliliters should be administered intravenously for a dose of 175 uCi
Calculate the temperature of the system once equilibrium has been reached. Assume that CP,m for Au and H2O are constant at their values for 298 K throughout the temperature range of interest
The half-lives of different radioisotopes are given in the table below. How long would it take (in minutes) for the amount of argon-44 to decrease from 28.0 mg to 3.50 mg?
Define what is the pH of the solution when 18.30 mL of 0.137 M trisodium hemimellitalate (trisodium benzene 1,2,3, tricarobxylate) is mixed with 25.00 mL of 0.274 M HNO3 (to two d.p.)?
Why does phenolphtalein change colour during the production of gas?
What is the pH of a buffer that results when 0.50 mole of Na3PO4 is mixed with 0.75 mole of HCl and diluted with water to 1.00 L?
1In a hydrogen fuel cell, hydrogen gas and oxygen gas are combined to form water. Write the balanced chemical equation describing this reaction (using lowest whole-number coefficients).
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