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Once you make a 100ml of 0.2M solution with 2.422 g of substance. If you take 10 ml of that solution you just made and add 90 ml of water and mix it. Then take 5 ml of the mixture and bring it to 25ml, what will be the concentration ofthe final solution in M?
What minimum voltage is required to electrolyze anhydrous HF? Hint: the H-F bond is so polar that liquid HF is essentially composed of H+ and F- ions.
Using the Henderson-Hasselbalch equation, calculate the pH of an ammonia buffer when the NH3:NH4+ ratio is 0.4 moles:0.6 moles. (pK = 9.75). Please explain and will rate lifesaver.
a metal sample weighing 37.6 grams, which has been heated to a temp of 100 degree cin boling water was placed in 48.6g of waterin a calorimeter. The inital temp of the water was 25.2 degree c.
A 0.130-mole quantity of NiCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Ni2 ions at equilibrium. Assume the formation constant* of Ni(NH3)62 is 5.5 × 108.
Acetonitrile CH3CN is a polar organic solvent that dissolves a wide range of solutes, including many salts. The density of a 1.90 M LiBr solution in acetonitrile is 0.827 g/cm3
What is the activation energy for a reaction if its rate is found triple when the temperature is raised from 615K to 632K
(Calculate using the given masses.) lighter isotope amu heavier isotope amu (c) Determine the average molecular mass of a Br2 molecule. amu (d) Determine the average atomic mass of a bromine atom. amu (e) Calculate the abundances of the two isotop..
determine the mass of aluminum acetate that can be made if 125 grams of acetic acid and 275 grams of aluminum hydroxide
For each of the following electronic transitions in the hydrogen atom, calculate the energy, frequency, and wavelength of the associated radiation, and determine whether the radiation is emitted or absorbed during the transition:
A chemical firm was hired to monitor a nearby lake for possible mercury contamination. Several samples were taken at different locations around the lake, including water samples.
Zinc sulfide reacts with nitric acid to give zinc sulfate and nitric oxide calculate the mass of zinc required to react with 110mL of 0.15M nitric acid
A diprotic acid, H2A, has the following ionization constants: Ka1 = 1.1 multiplied by 10-3 and Ka2 = 2.5 multiplied by 10-6. In order to make up a buffer solution of pH 5.80, which combination would you choose, NaHA/H2A or Na2A/NaHA? What is the p..
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