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Given stock solutions of 3 M Potassium Acetate and 500 mM EDTA, and a jar of solid Tris powder (molecular mass = 121 g/mol), how much of each component (including water) do you need to make 200 mL of a solution of 75 mM Potassium Acetate, 20 mM EDTA, and 100 mM Tris? Assume the density of Tris powder is 1 g/mL.
Water/methanol and water/acetone are viable solvent systems for recrystallization, but water/chloroform and water/pentane are not
magnesium ion solution and another electrode composed of silver in a 1.0 M silver ion solution, connected by a salt bridge. Calculate the standard potential for this cell at 25 °C. Standard reduction potentials
A sample of MgCl2 is known to be contaminated with NaCl. A 3.47-g portion of the sample is dissolved in water and treated with an excess of AgNO3 solution.
Consider the formation of nitrogen dioxide from nitric oxide and oxygen: 2NO(g) + O2(g) -> 2NO2(g) If 9.0L of NO are reacted with excess O2 at STP, what is the volume in liters of the NO2 produced?
the following findings, express to the nearest atomic mass unit, in agreement with Dalton's atomic theory? expalin your answer.
A weather ballon is filled with helium to a volume of 305L at 28 degree celcius and 751 mmHg . The ballon ascends to and altitude where the pressure is 504 mmHg and temperature
What is the percentage by mass of CH4 in the mixture. The standard enthalpies of combustion for CH4 and C2H6 are -890.3 kJ mol-1 and -1569.7 kJ mol-1, respectively.
What velocity must an electron have in order to have a de Broglie wavelength of 1.00 A? What velocity must a proton have in order to have the same de Broglie wavelength
Determine the pH of a 0.62 M NH4NO3 solution at 25°C. The Kb for NH3 is 1.76 × 10-5.
2Na + 2H2O ----> 2NaOH + H2 . If 7.2g of Na undergoes reaction with water and the resulting hydrogen is bruned in oxygen to produce water, how many grams of water would be produced
A buffer is to be prepared with a pH of 4.5 from 0.1M solutions of sodium acetate and acetic acid. How many mL of 0.1M NaAc would have to be added to 100mL of 0.1M HAc to make the proper buffer solution?
Which radio station broadcasts at a longer wavelength: 93.9 FM or 104.3 FM? To support your answer, list the actual wavelength values and units for each of these radio stations.
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