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Define buffer capacity and explain why the buffer capacity reaches a maximum when pH=pKa?
If the melting point of the compound is unknown the melting point measurement could take an exceedingly long time if the rate of heating of 2C/min is followed over the entire range from room temperature to the melting.
patient if the recommended dose is 6.50 mg of aspirin per Kg of body weight? How many molecules does the patient ingest?
A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of m = 0.700fg (where a femtogram, fg, is 10?15g) and is swimming at a velocity of v = 2.00?m/s , with an uncertainty in the velocity of 8.00 %
Calculate tthe freezing point in centigrade units of a soluiton consisting of 685 grams of ethylene glycol dissolved
The ratio of the number of atoms of the isotopes 69Ga and 71Ga in eight samples from different sources was measured in an effort to understand differences in reported values of the atomic mass of gallium
Which group includes only exothermic processes? Cu(s) + H2SO4(aq) 11. In the reaction shown below, which substances are dissolved in water?
Suppose you have a sample of sodium weighing 11.62 g. How many atoms of sodium are present in the sample?
Organic Chem: A hexose A was obtained after (-) glyceraldehyde underwent three successive Killani-Fischer syntheses. Oxidation of A with nitric acid forms an optically inactive aldaric acid B. Wohl degradation of A followed by nitric oxidation giv..
What is the minimum quantity (in grams) of atmospheric oxygen required to completely convert 3.77 moles of ethanol into carbon dioxide and water
Derived from common sense is the same as the one derived mathematically from the equation obtained in the experiment.
2HI(g) ? H2(g) + I2(g) Keq = 0.016. Initially a container contains 0.46 M HI and no product. What is the equilibrium concentration of H2
A sample of hydrogen occupies a volume of 1.20 liters at a pressure of 425 kilapascals. If the temperature of the gas is constant, what would the new volume of the gas be at 615 kilapascals?
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