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A buffer that contains 0.49 M of the base, B, and 0.29 M of its conjugate acid, BH+, has a pH of 8.10. What is the pH after 0.0025 mol HCl is added to 0.25 L of this solution?
volume of methane gas is cooled from 298 K to 149 L. If the pressure remains constant, what is the final volume?
When the band relaxes, the chains return to a tangled state. what happens to the entropy of the band when a stretched band relaxes
Your observations should reveal a difference in at least one property between sodium benzoate and benzoic acid. What property was that, and what observation will reveal the difference?
Solids do not "flow". What does this behavior imply about the speeds at which the individual solid particles are moving relative to each other?
Presence of Aldehyde Group, An excellent way to identify the presence of an aldehyde group is by 1H NMR. The chemical shift of the aldehydic proton occurs in the 9-10-ppm region
Calcium chloride (CaCl2; very soluble) has been sold as a more effective de-icer than NaCl to spread on icy sidewalks. What would be the ionic strength of a solution
The peak absorbance of the first chromatographic peak at 300nm was 0.020 and at 350nm 0.030. What is the main component of the first eluting peak and what percentage of the total absorbance at 300nm is due to this component?(assuming the light pat..
A young child grows rapidly, with high levels of cell division and high energy requirements. If you were planning the child's diet, which food groups would you emphasize, and why? Which good groups would you deemphasize, and why?
4.5 L of Mg(OH)2 solution was titrated with 5.03 mL of 0.200 M HCl. Calculate the the molarity of Mg(OH)2 solution and the ksp.
Approximately how many grams of calcium nitrate were required to react totally with 40.0 g of sodium carbonate? How many grams of product were formed at that point? Do your answers appear to obey the Law of Conservation of Matter?
Calculate the work associated with the compression of a gas from 121.0 L to 80.0L at a constant pressure
Most community water supplies contain 0.5 ppm chlorine added for purification. What mass of chlorine must be added to 1500. L of water to reach this level. (Hint: the density of water is 1.00 g/mL)
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