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 a second test tube, you added 6 M NH4OH dropwise. Explain, in terms of the ammonia/ammonium ion equilibrium, why the phenolphthalein equilibrium shifted to the right?
1 answer:
Answer: 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.
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Answer:
Explanation:
Hello there!
In this case, for these types of acid-base neutralizations, it is crucial to firstly set up the chemical reaction taking place between the acid and the base; in this case HCl and Mg(OH)2 respectively, whose products are obtained by switching around the anions and cations as shown below:
Which must be balanced to accurately predict the mole ratio on the reactants side:
Whereas we can see a 2:1 mole ratio of the acid to the base; thus, the moles of Mg(OH) required for the neutralization of 6.0 moles of HCl turn out to be:
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