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What is the concentration of Ba(OH)2 in aBa(OH)2 solution if the pH is 8.25? What is the concentration of ammonium ion that must be in a0.15 M NH3 solution to produce a buffer of pH =8.0?
A 200-mL volume of NaOH solution was addedto 400mL of a 2.00 M HNO2 solution. The pH of themixed solution was 1.5 units greater than that of the original acidsolution. Calculate the molarity of the
300 grams of copper metal at 90 degrees celsius is added to a beaker that holds 15.0 grams of ice and 80.0 grams of water at 0.0 celsius. As the copper cools, the ice melts and then the 95.0 grams o
Which techniques can be used to measure metal ion concentrations and what are the advantages and limitations of each technique.
The vapor pressure of pure ethanol at 60oCis 0.459 atm. What is the vapor pressure predicted by Raoult's Law of a solution prepared by dissolving 10.0 mmolnaphthalene (nonvolatile) in 90.0 mlili mol
How does the size of the alkyl group of the alcohol affect the vigor of its reaction with sodiummetal? Why does the length ozf the carbon chain in analcohol affect its solubility in water?
In the preparation of sulfanilamide, why was aqueous sodium bicarbonate, rather than aqueous sodium hydroxide, used to neutralize the solution in the final step?
Distinguish between the primary quantum yield and overall quantum yield of a chemical reaction. Describe an expermintal procedure for determination of quantum yield.
How is the sulfate precipitated? What method is employed to ensure "cmplete" preciptation of the sulfate?Gravimetric Determination of Sulfate
Ions B and C react to form BC. If 15.0 mL of 1.00M B is combinedwith 15.0 mL of 1.00M C, .00450 mol BC is formed. Determine the equilibrium constant.
In the procedure for Determining the Fragrances, it suggests that the organic layer dropped onto the watch glass should be given a little time for excess alcohol to evaporate so that when you examin
Yellow sodium light is made up of photons of two wavelengths. 589.0nm and 589.6nm. What is the difference in energy injoules between the photins with these wavelengths?
An aqueous solution containing 4 mM of a weak acid (HA) has anabsorbance of 0.72 in a cuvet having an optical pathlength of 1 cm.Assuming that εH ˜ 0, εHA˜ 200 M-1cm-1 an
In a calorimeter experiment, the test tube which holds the metal forheating also contained some water which subsequently was added to the calorimeter.
The pKa values for oxalic acid, H2C2O4 are: 1.23 and 4.19respectively. Write each equilibrium acid dissociation reactionwith water with its respective Ka value.
What is the formal charge on each of the atoms in a molecule of fluorous acid (HOFO)? List the formal charges in the same order as they occur in the formula.
A 2.0 liter flask was filled with 4.00 mole NH3 (g) and heateduntil the NH3 (g) partially decomposes. After equilibrium wasreached, it was found that 2.00 mole gaseous NH3 (g) remains.Assume the rea
If the pressure exerted by ozone, O3, in the stratosphere is 3.0 x 10-3 atm and the temperature is250 K, how many ozone molecules are in a liter of the air?
The solubility product for magnesium fluoride is6.4x10-9. What is the molar solubility of magnesium fluoride in moles per liter of solution.
186 grams of sodium oxide, a basic anhydride, are to be neutralized in a 2 step method. First the solid is added to excess water to produce an aqueous solution of sodium hydroxide.
If an analyte exhibits both absorbance and fluorescence at a given excitation wavelength, what will doubling the irradiance beam do,if anything?
Why is methyl alcohol CH3OH better at protecting solutions againstfreezing than other molecules? Or more generally where can I findsome good literature that has general advice to help one predict c
There are 3 main light components in turbid light media:ballistic photons, snake photons and diffuse component. Why doesnt transparent medial have a diffuse component.
Mr. T. Rains was given a 50.0 mL sample of 0.150 M solution of HCOOH. Using a buret, he transferred 25.0 mL of the weak acidinto a 250 mL Erlenmeyer flask. He then titrated the acid with a standardi
An unknown amount of compound W is composed of 42g of Hg,1.26x10^23 atoms of Cl and 0.63 mol of O. It's molecular weight is567 g/mol what are the empirical and molecular formulas of W?