9.6 KiB
9.6 KiB
| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Amphoterism | 2/2 | https://en.wikipedia.org/wiki/Amphoterism | reference | science, encyclopedia | 2026-05-05T10:51:47.144736+00:00 | kb-cron |
SnO
2
+
4
HCl
acid
↽
−
−
⇀
SnCl
4
+
2
H
2
O
{\displaystyle {\ce {SnO2 + {\overset {acid}{4 HCl}}<=> SnCl4 + 2H2O}}}
SnO
2
+
4
NaOH
base
+
2
H
2
O
↽
−
−
⇀
Na
4
[
Sn
(
OH
)
8
]
{\displaystyle {\ce {SnO2 + {\overset {base}{4 NaOH}}+ 2H2O <=> Na4[Sn(OH)8]}}}
Vanadium dioxide (VO2):
VO
2
+
2
HCl
acid
⟶
VOCl
2
+
H
2
O
{\displaystyle {\ce {VO2 + {\overset {acid}{2 HCl}}-> VOCl2 + H2O}}}
4
VO
2
+
2
NaOH
base
⟶
Na
2
V
4
O
9
+
H
2
O
{\displaystyle {\ce {4 VO2 + {\overset {base}{2 NaOH}}-> Na2V4O9 + H2O}}}
Some other elements which form amphoteric oxides are gallium, indium, scandium, titanium, zirconium, chromium, iron, cobalt, copper, silver, gold, germanium, antimony, bismuth, beryllium, and tellurium.
== Hydroxides == Aluminium hydroxide is also amphoteric:
Al
(
OH
)
3
+
3
HCl
acid
⟶
AlCl
3
+
3
H
2
O
{\displaystyle {\ce {Al(OH)3 + {\overset {acid}{3 HCl}}-> AlCl3 + 3 H2O}}}
Al
(
OH
)
3
+
NaOH
base
⟶
Na
[
Al
(
OH
)
4
]
{\displaystyle {\ce {Al(OH)3 + {\overset {base}{NaOH}}-> Na[Al(OH)4]}}}
Beryllium hydroxide:
Be
(
OH
)
2
+
2
HCl
acid
⟶
BeCl
2
+
2
H
2
O
{\displaystyle {\ce {Be(OH)2 + {\overset {acid}{2 HCl}}-> BeCl2 + 2 H2O}}}
Be
(
OH
)
2
+
2
NaOH
base
⟶
Na
2
[
Be
(
OH
)
4
]
{\displaystyle {\ce {Be(OH)2 + {\overset {base}{2 NaOH}}-> Na2[Be(OH)4]}}}
Chromium hydroxide:
Cr
(
OH
)
3
+
3
HCl
acid
⟶
CrCl
3
+
3
H
2
O
{\displaystyle {\ce {Cr(OH)3 + {\overset {acid}{3 HCl}}-> CrCl3 + 3H2O}}}
Cr
(
OH
)
3
+
NaOH
base
⟶
Na
[
Cr
(
OH
)
4
]
{\displaystyle {\ce {Cr(OH)3 + {\overset {base}{NaOH}}-> Na[Cr(OH)4]}}}
== See also ==
Ate complex Isoelectric point Zwitterion
== References ==