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alexandroperez13
25.09.2019 •
Chemistry
In part iii, the phenolphthalein indicator is used to monitor the equilibrium shifts of the ammonia/ammonium ion system. the phenolphthalein equilibrium established with water is hph(aq)(colorless) + h2o (l) h3o+ (aq) + ph-(aq)(pink or red). you compared the color of the solutions in three test tubes that initially contained 3 ml of 0.1 m ammonium hydroxide and a few drops of phenolphthalein indicator. in the first test tube, you added 1 m nh4cl dropwise. what color change was observed and what did this color change indicate about the shift in the phenolphthalein equilibrium? a. the solution turned a more intense pink or red color indicating that the phenolphthalein equilibrium shifted to the left, producing more of the pink or red colored hph.
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Ответ:
The pink color in the solution fades. Some of the colored indicator ion converts to the colorless indicator molecule.
ExplanationWhat's the initial color of the solution?
The first test tube used to contain
.
is a weak base that dissociates partially in water.
There's also an equilibrium between
and
ions.
The indicator equilibrium will shift to the right to produce more
ions along with the colored indicator ions. The solution will show a pink color.
What's the color of the solution after adding NH₄Cl?
Adding
will add to the concentration of
ions in the solution. Some of the
ions will combine with
ions to produce
.
The equilibrium between
and
ions will shift to the left to produce more of both ions.
The indicator equilibrium will shift to the left as the concentration of
increases. There will be less colored ions and more colorless molecules in the test tube. The pink color will fade.
Ответ:
I need an answer someone HELP M