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What fraction of piperazine (perhydro-1,4-diazine) is in each of its three forms (H2A, HA-, A2-) at pH 8.26.
What is the concentration of the sodium hydroxide at the lower temperature. Assume the solution is dilute enough to have physical properties of water.
we are doing an analysis of cola lab in my chem I lab. We have to do pre-lab questions and one of them is- how will you use compounds of different colors to determine the relationship between percet transmittance and wavelength? or between absorba..
Solutions with greatest long-wavelength UVA absorption: Name of strongest UVA absorbing ingredient
Calculate the concentrations of all species in a 1.75 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10-2 and Ka2 = 6.3× 10-8.
one day you notice that the outside temperature increase by 16 degrees Fahrenheit between your early morning jog and your lunch at noon. what is the corresponding change in temperature in the Celsius and Kelvin scales?
A student finds that during a reaction, the 150.g of water in the reaction cup warms from 21.0 Celsius to 28.5 degrees Celsius.
Does a chemical change occur when you cook an egg? Why or why not? When you fry an egg, it becomes a solid, the heat makes it smoke, and the color changes from clear and yellow to all yellow.
how many grams of K2SO4 would you need to prepare 1500g of 5.0% K2SO4 (m/m) solution?
What mass (in grams) of CH4 is contained in a 555 mL volume at a pressure of 760.0 torr, and at a temperature of 400.0 K?
An argon ion laser which operates at 488.2 nm is used to excite the tagged proteins and observe fluorescence. A 5 µM solution gives a signal of 0.852 relative fluorescence units. What is the wave number of the laser light at 488.2 nm?
What mole ratio of sodium acetate to acetic acid, pKa = 4.74, should be used in preparing a buffer solution having a pH of 4.35
How much work is done in kilojoules for the reaction of 6.40 of acetylene at atmospheric pressure if the volume change is -2.76.
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