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The acid-dissociation constants of phosphoric acid (H3PO4) are Ka1 = 7.5 × 10-3, Ka2 = 6.2 × 10-8, and Ka3 = 4.2 × 10-13 at 25.0 °C. What is the pH of a 2.5 M aqueous solution of phosphoric acid?
A student in a hurry decides to let the solvent travel only half way up the chromatographic paper in chromatogram 2. predict the effect of this procedural change on the resultion
when electrons move from the fourth energy level to the second energy level, they emit visible light. explain why the light emitted when an electron makes this move in a sodium atom is a different color than the light emitted
Describe how chemical labeling and crystal structures can be used to determine residues important
The combustion of ethene, C2H4 , occurs via the reaction C2H4 (g) + 3O2(g) ===> 2CO2(g) + 2H2O(g) with heat of formation values given by the following table
Suppose y was measured five times and average of these five measurements was 3.24. What is the uncertainty in x based on these five measurements
The ideal gas law (PV=nRT) provides relationships among pressure, volume, amount, and temperature of a gas inside a container. If the Kelvin temperature in a container is doubled, which of the following changes may occur?
Indicate what precipitates, if any, form when solutions of each of the following are added to a solution containing the Group I cations.
What is the de Broglie wavelength (in meters) of a mosquito weighing 1.50 mg and flying at 1.34 m/s?
Carbonic acid then ionizes in water (Ka1 = 4.5× 10-7). Ignoring Ka2, estimate K for the overall process by which CO2 and H2O form H and HCO3-.
Rubidium atoms are bombarded with 131 nm light. What is the kinetic energy of the ejected electrons
The natural abundance of c-14 in all living things is 1ppt. The half life of c-14 is 5,730 year (+/- 40 years). How old is something (+/-) that is found to have
How do old dispersive infrared (IR) instruments use a grating to separate the infrared source by wavelength before passing through the sample?
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