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You need to make 500 ml of 100 mM potassium phosphate buffer at pH 7.5. You have the stock solutions of KH2PO4 and K2HPO4 at 1M each. You willmake the buffer by adding some of each of these stock solutions to water. How many mls of the KH2PO4 stock solution will you use? The pKa values for phosphate are 2.12, 7.21, and 12.3. Thank you for your assistance.
Now calculate the amount of moles of NaHSO4(s) to be dissolved in the system to lower the pH to 2.40. Include the rxn equations that take place.
If the densities of 20%, 50% and 70% solutions are 0.69 and 0.58 and 0.49 g/mL, respectively, and the denisty of the unknown solution is 0.50 g/mL, what is the approximate concentration of the unknown solution.
What is the chemical formula for a compound containing half as many barium atoms as iodine atoms?
The payment sugar beet growers receive is based on the sucrose content of their delivered beets. A sample is taken from each load of beets and the sugar content in the beets is determined by polarimetry of the beet extract. In a typical situation ..
calculate the empirical formula of hydrated ferrous ammonium sulfate feanh4bso4ch2od from the following data.a. 0.7840
A 0.351 L solution of 1.41 M oxalic acid (Ka1 = 6.5e-2 and Ka2 = 6.1e-5) is titrated with 1.25 M KOH. What will the pH of the solution be when 0.7008 L of the KOH has been added
A buffer is made up of 355 mL each of 0.200 M NaHCO3 and 0.134 M Na2CO3. Assume that volumes are additive. Enough water is added to this buffer to make the total volume 10 L. Calculate the pH of the buffer after the addition of 0.0300 mol of HCl t..
What volume, in L, of hydrogen gas at standard temperature and pressure (STP) is produced from reacting 0.333 L of 0.807 M hydrochloric acid with aluminum metal? (1 mol of gas @ STP = 22.4 L).
A local radio station can be tuned in by dialing your radio to a frequency of 101.5 MHz. Calculate the energy of the wave.
According to quantum mechanics, the energy levels for an particle with mass m (such as an electron) confined in a 1-dimensional box of length a is given by
Rank the solutions from the highest to lowest pH.
The normal melting point of napthalene is 353.05K. When the solution becomes saturated at 310k, we expect the mole fraction of napthalene in the saturated solution.
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