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The apparent color of a solution corresponds to the wavelengths of visible light the solution transmits. Thus, a green transmits green light, and it absorbs red and blue light. The wavelength ranges corresponding to each color of light are approximate: red, 700-620 nm; orange, 620-590 nm ; yellow , 590-570 nm; green, 570-500 nm; violet, 450-400nm. You have drawn the absorption spectra for the solution containing 5.0, 6.7, and 7.5 mL of 2.0 X10^-2 M EN. Account for the color of each of these solutions on the basis of its lambda max.
A student weighed a fuel cup for a bomb calorimetry experiment and obtained 10.3729 g. She then added a benzoic acid pellet and reweighed, finding 11.2872 g
the Ka of hydrazoic acid (HN3) is 1.9*10^-5 at 25 degrees C. what is the pH of a .35M aqueous solution of HN3?
The hydrogen is recovered as its most stable oxide. When the oxide was made to decompose completely it released 1.274x10^25 molecules of oxygen gas.
Hydrobromic acid reacts with potassium carbonate to form potassium bromide,carbon dioxide , and water. Barney the incompetent lab tech accidently knocked a flask containing 255ml of 0.500 M hydrobromic acid onto the floor, and now he has to clean ..
A beaker with 100 mL of an acetic acid buffer with a pH of 5.00 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 8.60 mL of a 0.380 HCl solution to the beaker. How much will the pH c..
which the excess HClO4 was back-titrated with 8.72-mL of 0.3045 M NaOH using bromocresol green as an indicator. What is the concentration of the perchloric acid solution?
A 585 g piece of copper tubing is heated to 97.2°C and placed in an insulated vessel containing 51.0 g of water at 26.0°C.
Starting with only the solid, it is found that at 40C the total gas pressure (NH3 and CO2) is 0.33 atm. Calculate the euilibrium constant Kp/
The rate constant of a reaction is 7.50*10-5 L/mol·s at 195°C and 5.30*10-3 L/mol·s at 258°C. What is the activation energy of the reaction, in kJ/mol
Calculate the partial pressure in atmospheres of O2 in the air outside an airplane cruising at an altitude of 10km where the atmospheric pressure is 190.0 mmHg.
What was the nucleophile generated? What are the other products that can be formed in the presence of sulfuric acid?
A solution of PbI2 has [Pb2+] = 4.5 x 10-5 and [I-] = 6.5 x 10-4. PbI2 has Ksp = 8.7 x 10-9. Write down the reaction that is taking place. Calculate Q. Is Q larger or smaller than the Ksp? Is the solution unsaturated, saturated, or supersaturated?..
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