1. How do the results you observed when excess KOH was added illustrate the amph

Question

1. How do the results you observed when excess KOH was added illustrate the amphoteric nature of aluminum hydroxide? Explain! 2. Predict what would happen if the initial precipitates in Part 2 were treated with sulfuric acid rather than the excess KOH. Describe the changes you observed when 10 drops of 0.30 M KOH was added a. Al(NOs)s heoune ch kenume cloudy b. Fe(NOs)s no Change c. Ni(NOs)h dloud light grer Describe the changes you observed when the additional KOH was added to: b. Fe(NOs)h beecume a cleer yell ow until it os stirr ea C. NiNOsh remained oludy oind ligt green

Explanation / Answer

1. How do the results you observed when excess KOH was added illustrate the amphoteric nature of aluminum hydroxide? Explain!

Note that:

Al+3 + 3OH- --> Al(OH)3(s)

precipitate forms

if excess OH-

Al(OH)3(s) + H2O --> Al(OH)4-(aq) + H+(aq)

Therefore, as stated

Aluminium can act as a base or acid depending on the amount of KOH added

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