msjsnell29
27.04.2021 •
Chemistry
A team of scientists claim that they have discovered a new experimental
method for determining atomic mass. Which of the following is necessary for
the claim to be considered valid?
A. Another team of scientists must be able to replicate the results of
the experiment
B. The method must work for all isotopes,
C. The atomic mass of an element according to the new method
must be less than its previous measurement.
D. The atomic mass of an element according to the new method
must be greater than its previous measurement.
Solved
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Ответ:
The solution turns more intense pink.
Explanation:
In NH4OH, a delicate ammonia/ammonium equilibrium is set up as shown
NH4+. + OH-<----> NH3 +. H2O
As the concentration of NH4OH increases, the solution turns more intense pink since the equilibrium shifts towards the right and phenolphthalein moves towards the ionized form as more ammonia is produced from the equilibrium above making the solution more basic. The equilibrium shifts for phenolphthalein is shown in the image attached.