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Sn

Stannum
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| VICINO |
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31
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32
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33
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49
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50
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51
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81
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82
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83
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Tin has been known since ancient times. The origin of the name comes from the Latin word stannum meaning tin. It is silvery-white, soft, malleable and ductile metal. Exposed surfaces form oxide film. Resists oxygen and water. Dissolves in acids and bases. Organic tin compounds may be highly toxic.
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ENERGIE DI IONIZZAZIONE ED ABBONDANZA |
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Isotopo |
Massa atomica relativa |
Abbondanza (%) |
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112Sn | 111.904821(5) | 0.97(1) |
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114Sn | 113.902782(3) | 0.65(1) |
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115Sn | 114.903346(3) | 0.34(1) |
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116Sn | 115.901744(3) | 14.53(1) |
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117Sn | 116.902954(3) | 7.68(7) |
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118Sn | 117.901606(3) | 24.23(11) |
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119Sn | 118.903309(3) | 8.59(4) |
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120Sn | 119.902197(3) | 32.59(10) |
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122Sn | 121.903440(3) | 4.63(3) |
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124Sn | 123.905275(1) | 5.79(5) |
Tin is principally found in the ore cassiterite (SnO2) and stannine (Cu2FeSnS4). Used as a coating for steel cans since it is non-toxic and non-corrosive. Also in solder (33%Sn:67%Pb), bronze (20%Sn:80%Cu) and pewter. Stannous fluoride (SnF2), a compound of tin and fluorine is used in some toothpaste. The price of 99.8 % pure tin shot is 57.70 € for 500 g.
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POTENZIALI DI RIDUZIONE STANDARD |
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Semi-Reazione |
Eo / V |
Annotazione |
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Sn4+ + 2e- Sn2+ |
+0.154 |
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Sn4+ + 2e- Sn2+ |
+0.14 |
1 mol dm-3 HCl |
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Sn4+ + 4e- Sn(s) |
+0.01 |
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Sn2+ + 2e- Sn(s) |
- 0.136 |
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Sn2+ + 2e- Sn(s) |
- 0.16 |
1 mol dm-3 HClO4 |
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SnO32- + 3H+ + 2e- HSnO2- + H2O |
+0.374 |
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SnO32- + 6H+ + 2e- Sn2+ + 3H2O |
+0.844 |
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HSnO2- + 3H+ + 2e- Sn(s) + 2H2O |
+0.333 |
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Sn(s) + 4H+ + 4e- SnH4(g) |
- 1.074 |
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