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Calculate the volume of 1M solution of HCL needed for 1 unit shift of the pH of the following solutions:
A. 100 mL of 0.01 M solution weak acid (pKa = 6) and 0.05 M of its sodium salt
B. 0.005 M of sodium formiate and 23 g of formic acid dissolved in 100 mL of water (pKa of formic acid = 3.75)
C. 100 mL of 0.1 M ammonia solution
A solution is prepared by adding some solid CaF2 to water and allowing the solid to come to equilibrium with the solution. The equilibrium constant for the reaction below is Kc = 3.9x10-11.
A. A student places 2.10 L of water in his dormitory room, which has the volume of 4.06 x10^4 L. He seals the room and waits for the water to evaporate. At 25 deg C, the density of water is 0.997 g/mL
The generic metal hydroxide M(OH)2 has Ksp= 6.64x10^-18. (Note: In this particular problem, because of the magnitude of the Ksp and the stoichiometry of the compound, the contribution of OH from water can be ignored. However, this may not always b..
A spoon was silver plated electrolytically in a Silver nitrate solution. If 0.750 grams of silver was deposited on the spoon at a constant current of twenty mili amperes, determine how long in hours did the electrolysis take?
Multiple choice questions in organic chemistry - Which of the following statements are true about the processes of melting and freezing?
Sketch bonding orbitals that result from combinations of the following orbitals on separate atoms (a) pz and dz2 (b) s and pz (c) dx2-y2 and dx2-y2
Doubling the distance between an individual and the source of radiation reduces the radiation exposure to one-fourth the original value.
The compound has a molecular mass of 70. D) The compound contains a cyano or alkyne group. E) The compound contains a CO group
For a certain glass electrode, the selectivity coefficient for Na+ relative to H+ is 1.0E-12. The electrode is calibrated with NBS standard buffers 6.86 and 9.18,
The polarogram for 20ml of solution that was 3.65*10^-3 in Cd2+ gave a wave for that ion with a diffusion current of 31.3µA . calculate the percentage in change in concentration of the solution
The two occuring isotopes of gallium-69 and gallium-71,which are found in the ratio of 3:2. Determine the atomic mass of gallium.
A 479-mL sample of unknown HCl solution reacts completely with Na2CO3 to form 12.1 g CO2. What was the concentration of the HCl solution?
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