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Make a 2.00L of a sodium phosphate buffer pH 5.05 and another 2.00L sodium phosphate buffer of 7.12 pH using the Henderson-Hasselbach equation, determine how much and which salts you will use if you add the correct amount of salts, sometimes the pH can still vary. Why is that? Other than temperature change?
Twenty-five milliliters of liquid nitrogen (density = 0.807g/mL ) is poured into a cylindrical container with a radius of 11.9cm and a length of 17.2cm . The container initially contains only air at a pressure of 760.0mmHG (atmospheric pressure) a..
how many liters of H2 would be formed at 628 mm Hg and 14 degrees celcius if 22.5g of zinc was allowed to react
what hydrogen ion concentration should be required to dissolve 0.10m mgf2 if the ksp for magnesium fluoride is 6.8x10-9
In aqueous solution, the hydrated radius of hemoglobin is found to be 3.55 nm. How many water molecules hydrate a hemoglobin molecule?
Calculate the percent relative error for the three solutions if perfect technique is used. Report the two new molarities. (The error in a 10-mL transfer pipet is 0.02, and the error in the 200-mL volumetric flask is 0.1)
A sample of air was compressed to a volume of 27.0 L. The temperature was 297.0 K, and the pressure was 8.70 atm. How many moles of gas were in the sample
Explain when 14.0ml of HCL of unknown concentration but less than that of the base are reacted with 15 ml of 3.218M NaOH, 2.01 KJ of heat are released. Explain what is the molarity of the HCL solution
Explain the wavelengths of several photons are provided below. Explain which photon has the largest energy
A corrosion potential of -0.299 V versus SCE was measured for a corroding alloy. what was the potential versus SCE?
Using the standard enthalpies of combustion, calculate the standard enthalpies of the following reactions: A. C2H5OH(l)+3O2(g)>2CO2(g)+3H2O(l)
What mass of rm KCl is needed to precipitate the silver ions from 15.0 mL of 0.190 M rm AgNO_3 solution?
Assume that the Pauli Exclusion Principle was somehow changed to permit three electrons per orbital rather than two. a) Instead of an octet, how many outer-shell electrons would be required for a noble-gas electron configuration
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