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A buffer solution of pH 5.3 is to be prepared from propionic acid and sodium propionate. The concentration of sodium propionate must be 0.50 M. What should the concentration of propionic acid be? Ka = 1.3 X 10-5
Which of the following is true about an endothermic reaction?
For drug development, it is crucial to optimize the half-life of elimination of the drug so that the drug has long enough to act but not enough time to cause harmful side-effect.
Consider a solution of carbonic acid, H2CO3. (a) Calculate the H3O+ ion concentration of a 0.15 M solution of carbonic acid.
Nitric acid is not only a strong acid but also a strong oxidizing agent. In hot concentrated acid solution, the reaction with zinc is: 3 Zn(s) + 8 HNO3 ? 3 Zn(NO3)2(aq) + 2 NO(g) + 4 H2O
Consider a solar with no dye where TiO2 is insted the light-absorbing species. the energy required to exite an electron in TiO2 is 3.21 eV. A. A) calculates the minimum wavelength of light required to excite an electron in TiO2.
Which of the following is not a buffer solution?
Copper is highly sensitive to oxidation by molecular oxygen. Higher oxidation states of Cu do not catalyze diazocoupling reactions. Define oxidation (loss of electrons) and define a redox half reaction for the oxidation of CuI by O2
Calculate the pH during the titration of 30.00 ml of 0.1000 M KOH with 0.1000 M HBr solution after the following additions of acid.
Name the type of coupling that happens when two atoms connected through covalent bonds transfer their energy when they ring.
When 2.05 moles of a monoatomic ideal gas is reversibly heated at constant volume from 25 degrees celcius to 45 degrees celcius the entropy change of the system
Describe an expreiment to determine the molal freezing point depression constant
A beaker with 185 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 6.70 mL of a 0.440 M HCl solution to the beaker.
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