Amphoteric Behavior of Alum
Click on the correct answer
1
Alum is
aluminum phosphate
aluminum
aluminum sulfate
aluminum chloride
the graduate of a university
2
Solubility depends on all the following factors. Which single factor is best shown in this demonstration?
temperature
nature of the solvent
particle size
pH
pressure
3
Acidic solutions
contain more hydronium ions than hydroxide ions
contain more hydroxide ions than hydronium ions
contain equal numbers of hydronium and hydroxide ions
contain only hydronium ions
contain only hydroxide ions
4
An indicator
is sensitive to pH
indicates the solution temperature
does not change color with pH
indicates whether a precipitate forms
may be used only at some pH values
5
Amphoteric refers to
metal hydroxides
color changes
indicators
a pH of 4 to 10
precipitate formation
6
By definition, a precipitate is
soluble
colored
acidic
basic
insoluble
7
A pH of 9 would be considered
neutral
acidic
basic
8
At which pH would alum be insoluble
2
3
6
11
12
9
At which pH value would the tetrahydroxoaluminate species form?
pH 2
pH 4
pH 7
pH 10
pH 12
10
A metal hydroxide that does not exhibit amphoteric behavior at different pH values is
zinc
chromium
aluminum
tin
sodium