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Problem- 1) A biochemist wishes to prepare various phosphate buffers by mixing together two 0.20 M solutions that contain either sodium dihydrogen phosphate (NaH2PO4) or disodium hydrogen phosphate (Na2HPO4).
2) In what ratio should these solutions be combined to give a buffer with pH of 7.0, with pH of 6.5, and with pH of 7.5?
3) If a total volume of 1.00 L is needed for a pH 7.2 buffer solution, what volumes of the original two solutions will be needed to prepare this buffer? What mass of the solids Na2HPO4•2H2O and NaH2PO4•2H2O will be needed to prepare these solutions?
Articulate your answer to two significant figures as well as comprise the appropriate units.
A voltaic cell consists of an Au/Au3+ electrode (E° = 1.50 V) and a Cu/Cu2+ electrode (E° = 0.34 V). Calculate [Au3+] if [Cu2+] = 1.20 M and Ecell = 1.13 V at 25°C.
what is the total volume of gases produced by the combustion of 500g of butane. assume 1 atm, temp 28 degrees C and that water is produced as a gas
2H2S (g) + 3O2 (g) → 2H2O (g) + 2SO2 (g) If 3.50 g of H2S are used in the above reaction, what will be the theoretical yield of water in grams.
A piece of iron limestone weighing 0.1965g was allowed to react with an excess of hydrochloric acid. The calcium in it was precipitated as calcium ethanedioate.
One of the ways catalysts increase reaction rates is by A. Providing a surface for the reaction to occur. B. Increasing the activation energy requirement of the reaction.
What is the value of K_sp for tin(II) sulfide, given that its solubility
In the formula for sodium phosphate (Na3PO4) how many moles of sodium are represented? How many moles of phosphorus? how many moles of oxygen?
give full mechanism: show the base-catalyzed formation of the monobutylated product from 1-chlorobutane and diethyl malonate
Gasoline currently powers the majority of automobiles in the U.S. but electric cars have been touted as a way to reduce our dependence on gasoline as well as improve our air quality by reducing production of byproducts associated with gasoline com..
Lewis Structure and state which of the given compounds are isomers - There are three compounds are given as I. pentane , II. 2-methylbutane , III. 2,3-dimethylbutane , IV. 2,2-dimethylpropane V.
using any diagrams that you wish to draw, explain how the Ocean Optics spectrophotometer works. Note: we are not asking how to operate the spectrophotometer.
The wavelength of maximum absorbance is solvent dependent. in water, the wavelength of maximum absorbance is 453 nm.
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