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A buffer was prepared by mixing a solution that is 0.285 M in HA and 0.385 in A-. The pH of this buffer was 4.435. Then to 405mL of this buffer solution was added to 21.5mL of 2.0 M HCL. Explain what is the pH of this new solution?
During physical activity, lactic acid (MM = 90.08 g/mole) forms in muscle tissue and is responsible for muscle soreness. An elemental analysis shows that it contains 40.0 mass percent C, 6.71 mass percent H
Which of the following pairs of molecules is listed in order of decreasing net dipole moment (from more polar molecule to less polar molecule)
To convert from the volume by percent of a gas to the mole fraction of a gas (i.e. problem 35 from chapter 9), why is it that all you have to do is divide the volume percent by 100%
Dibenzalacetone has two carbon-carbon double bonds. How many geometric isomers are possible? Draw all possible geometric isomers of the product and look up their melting points.
Measurements also show that a certain sample of the unknown compound contains 6.9 mol of oxygen and 2.32 of chromium
what is the standard reaction enthalpy for which the equilibrium constant is doubled when the temperature is increased by 10 C at 298 K
Why do flares contain magnesium powder rather than a solid piece of magnesium? -Smaller particles have a lower energy of activation than larger particles.
what is the ph of a 10-5nbspm coclo42nbspsolution? check your answer to be certain that caoh2snbspwill not precipitate.
10.00 ml of 0.100M HCL were used to titrate .300g of the sample using phenolphthalein as an indicator. Calculate the number of moles and the mass of sodium carbonate present in the mixture.
The molarity of Ca2+ in a saturated solution of CaCO3 was determined to be 0.0000616 M. Calculate the solubility product constant (Ksp) for CaCO3. CaCO3 (s) Ca2+ (aq) + CO32- (aq) Molar Mass (g/mol) CaCO3 100.09
The atmosphere of Venus contains carbon dioxide and nitrogen gases. At the planet's surface, the temperature is about 730 K, the total atmospheric pressure is 98 atm, and the partial pressure of carbon dioxide is 94 atm.
Calculate the amount of HCN that gives the lethal dose in a small laboratory room measuring 12.0 ft×15.0 ft×8.50ft.
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