Difference between revisions of "Platinum"
From Sciencemadness Wiki
(→Projects) |
|||
| (One intermediate revision by the same user not shown) | |||
| Line 26: | Line 26: | ||
|right=[[Gold]] | |right=[[Gold]] | ||
|number=78 | |number=78 | ||
| − | |atomic mass= | + | |atomic mass=195.084(9) |
|atomic mass 2= | |atomic mass 2= | ||
|atomic mass ref= | |atomic mass ref= | ||
| Line 34: | Line 34: | ||
|series comment= | |series comment= | ||
|series color= | |series color= | ||
| − | |group= | + | |group=10 |
|group ref= | |group ref= | ||
|group comment= | |group comment= | ||
| − | |period= | + | |period=6 |
|period ref= | |period ref= | ||
|period comment= | |period comment= | ||
| − | |block= | + | |block=d |
|block ref= | |block ref= | ||
|block comment= | |block comment= | ||
| − | |electron configuration= | + | |electron configuration=[Xe] 4f<sup>14</sup> 5d<sup>9</sup> 6s<sup>1</sup> |
|electron configuration ref= | |electron configuration ref= | ||
|electron configuration comment= | |electron configuration comment= | ||
| − | |electrons per shell= | + | |electrons per shell=2, 8, 18, 32, 17, 1 |
|electrons per shell ref= | |electrons per shell ref= | ||
|electrons per shell comment= | |electrons per shell comment= | ||
<!-- Physical properties --> | <!-- Physical properties --> | ||
|physical properties comment= | |physical properties comment= | ||
| − | |color= | + | |color=Silvery-white |
| − | |phase= | + | |phase=Solid |
|phase ref= | |phase ref= | ||
|phase comment= | |phase comment= | ||
| Line 104: | Line 104: | ||
|critical point ref= | |critical point ref= | ||
|critical point comment= | |critical point comment= | ||
| − | |heat fusion= | + | |heat fusion=22.17 |
|heat fusion ref= | |heat fusion ref= | ||
|heat fusion comment= | |heat fusion comment= | ||
| Line 110: | Line 110: | ||
|heat fusion 2 ref= | |heat fusion 2 ref= | ||
|heat fusion 2 comment= | |heat fusion 2 comment= | ||
| − | |heat vaporization= | + | |heat vaporization=510 |
|heat vaporization ref= | |heat vaporization ref= | ||
|heat vaporization comment= | |heat vaporization comment= | ||
| − | |heat capacity= | + | |heat capacity=25.86 |
|heat capacity ref= | |heat capacity ref= | ||
|heat capacity comment= | |heat capacity comment= | ||
| Line 119: | Line 119: | ||
|heat capacity 2 ref= | |heat capacity 2 ref= | ||
|heat capacity 2 comment= | |heat capacity 2 comment= | ||
| − | |vapor pressure 1= | + | |vapor pressure 1=2330 |
| − | |vapor pressure 10= | + | |vapor pressure 10=(2550) |
| − | |vapor pressure 100= | + | |vapor pressure 100=2815 |
| − | |vapor pressure 1 k= | + | |vapor pressure 1 k=3143 |
| − | |vapor pressure 10 k= | + | |vapor pressure 10 k=3556 |
| − | |vapor pressure 100 k= | + | |vapor pressure 100 k=4094 |
|vapor pressure ref= | |vapor pressure ref= | ||
|vapor pressure comment= | |vapor pressure comment= | ||
| Line 137: | Line 137: | ||
<!-- Atomic properties --> | <!-- Atomic properties --> | ||
|atomic properties comment= | |atomic properties comment= | ||
| − | |oxidation states= | + | |oxidation states=6, 5, '''4''', 3, '''2''', 1, −1, −2, −3 |
|oxidation states ref= | |oxidation states ref= | ||
| − | |oxidation states comment= | + | |oxidation states comment=(a mildly basic oxide) |
| − | |electronegativity= | + | |electronegativity=2.28 |
|electronegativity ref= | |electronegativity ref= | ||
|electronegativity comment= | |electronegativity comment= | ||
| − | |ionization energy 1= | + | |ionization energy 1=870 |
|ionization energy 1 ref= | |ionization energy 1 ref= | ||
|ionization energy 1 comment= | |ionization energy 1 comment= | ||
| − | |ionization energy 2= | + | |ionization energy 2=1791 |
|ionization energy 2 ref= | |ionization energy 2 ref= | ||
|ionization energy 2 comment= | |ionization energy 2 comment= | ||
| Line 155: | Line 155: | ||
|ionization energy ref= | |ionization energy ref= | ||
|ionization energy comment= | |ionization energy comment= | ||
| − | |atomic radius= | + | |atomic radius=139 |
|atomic radius ref= | |atomic radius ref= | ||
|atomic radius comment= | |atomic radius comment= | ||
| Line 161: | Line 161: | ||
|atomic radius calculated ref= | |atomic radius calculated ref= | ||
|atomic radius calculated comment= | |atomic radius calculated comment= | ||
| − | |covalent radius= | + | |covalent radius=136±5 |
|covalent radius ref= | |covalent radius ref= | ||
|covalent radius comment= | |covalent radius comment= | ||
| − | |Van der Waals radius= | + | |Van der Waals radius=175 |
|Van der Waals radius ref= | |Van der Waals radius ref= | ||
|Van der Waals radius comment= | |Van der Waals radius comment= | ||
| Line 171: | Line 171: | ||
|crystal structure prefix= | |crystal structure prefix= | ||
|crystal structure ref= | |crystal structure ref= | ||
| − | |crystal structure comment= | + | |crystal structure comment= Face-centered cubic (fcc) |
|crystal structure 2= | |crystal structure 2= | ||
|crystal structure 2 prefix= | |crystal structure 2 prefix= | ||
| Line 182: | Line 182: | ||
|speed of sound rod at 20 ref= | |speed of sound rod at 20 ref= | ||
|speed of sound rod at 20 comment= | |speed of sound rod at 20 comment= | ||
| − | |speed of sound rod at r.t.= | + | |speed of sound rod at r.t.=2800 |
|speed of sound rod at r.t. ref= | |speed of sound rod at r.t. ref= | ||
|speed of sound rod at r.t. comment= | |speed of sound rod at r.t. comment= | ||
| Line 188: | Line 188: | ||
|thermal expansion ref= | |thermal expansion ref= | ||
|thermal expansion comment= | |thermal expansion comment= | ||
| − | |thermal expansion at 25= | + | |thermal expansion at 25=8.8 |
|thermal expansion at 25 ref= | |thermal expansion at 25 ref= | ||
|thermal expansion at 25 comment= | |thermal expansion at 25 comment= | ||
| − | |thermal conductivity= | + | |thermal conductivity=71.6 |
|thermal conductivity ref= | |thermal conductivity ref= | ||
|thermal conductivity comment= | |thermal conductivity comment= | ||
| Line 207: | Line 207: | ||
|electrical resistivity at 0 ref= | |electrical resistivity at 0 ref= | ||
|electrical resistivity at 0 comment= | |electrical resistivity at 0 comment= | ||
| − | |electrical resistivity at 20= | + | |electrical resistivity at 20=1.05·10<sup>-7</sup> |
|electrical resistivity at 20 ref= | |electrical resistivity at 20 ref= | ||
|electrical resistivity at 20 comment= | |electrical resistivity at 20 comment= | ||
| Line 216: | Line 216: | ||
|Curie point ref= | |Curie point ref= | ||
|Curie point comment= | |Curie point comment= | ||
| − | |magnetic ordering= | + | |magnetic ordering=Paramagnetic |
|magnetic ordering ref= | |magnetic ordering ref= | ||
|magnetic ordering comment= | |magnetic ordering comment= | ||
| − | |tensile strength= | + | |tensile strength=125–240 |
|tensile strength ref= | |tensile strength ref= | ||
|tensile strength comment= | |tensile strength comment= | ||
| − | |Young's modulus= | + | |Young's modulus=168 |
|Young's modulus ref= | |Young's modulus ref= | ||
|Young's modulus comment= | |Young's modulus comment= | ||
| − | |Shear modulus= | + | |Shear modulus=61 |
|Shear modulus ref= | |Shear modulus ref= | ||
|Shear modulus comment= | |Shear modulus comment= | ||
| − | |Bulk modulus= | + | |Bulk modulus=230 |
|Bulk modulus ref= | |Bulk modulus ref= | ||
|Bulk modulus comment= | |Bulk modulus comment= | ||
| − | |Poisson ratio= | + | |Poisson ratio=0.38 |
|Poisson ratio ref= | |Poisson ratio ref= | ||
|Poisson ratio comment= | |Poisson ratio comment= | ||
| − | |Mohs hardness= | + | |Mohs hardness=3.5 |
|Mohs hardness ref= | |Mohs hardness ref= | ||
|Mohs hardness comment= | |Mohs hardness comment= | ||
| Line 240: | Line 240: | ||
|Mohs hardness 2 ref= | |Mohs hardness 2 ref= | ||
|Mohs hardness 2 comment= | |Mohs hardness 2 comment= | ||
| − | |Vickers hardness= | + | |Vickers hardness=400–550 |
|Vickers hardness ref= | |Vickers hardness ref= | ||
|Vickers hardness comment= | |Vickers hardness comment= | ||
| − | |Brinell hardness= | + | |Brinell hardness=300–500 |
|Brinell hardness ref= | |Brinell hardness ref= | ||
|Brinell hardness comment= | |Brinell hardness comment= | ||
| − | |CAS number= | + | |CAS number=7440-06-4 |
|CAS number ref= | |CAS number ref= | ||
|CAS number comment= | |CAS number comment= | ||
| Line 254: | Line 254: | ||
|prediction date ref= | |prediction date ref= | ||
|prediction date= | |prediction date= | ||
| − | |discovered by= | + | |discovered by= Antonio de Ulloa |
|discovery date ref= | |discovery date ref= | ||
| − | |discovery date= | + | |discovery date=1748 |
|first isolation by= | |first isolation by= | ||
|first isolation date ref= | |first isolation date ref= | ||
| Line 285: | Line 285: | ||
==Availability== | ==Availability== | ||
| − | Although it can be bought from precious metal stores, platinum is also found in certain electronics and car exhaust catalysts. Electrodes are sometimes coated with platinum. Platinum can be obtained along with silver in small amounts from capacitors obtained through [[electronic recycling]]. | + | Although it can be bought from precious metal stores, platinum is also found in certain electronics and car exhaust catalysts. Electrodes are sometimes coated with platinum. Platinum can be obtained along with [[silver]] in small amounts from capacitors obtained through [[electronic recycling]]. |
Platinum bullion can be bought, which has the advantage of having purity expressed accurately. | Platinum bullion can be bought, which has the advantage of having purity expressed accurately. | ||
| Line 296: | Line 296: | ||
==Projects== | ==Projects== | ||
*Make [[chloroplatinic acid]] | *Make [[chloroplatinic acid]] | ||
| − | *Make platinum | + | *Make platinum [[electrode]]s |
*Electrolysis | *Electrolysis | ||
*Make chlorates and perchlorates | *Make chlorates and perchlorates | ||
| Line 302: | Line 302: | ||
==Handling== | ==Handling== | ||
===Safety=== | ===Safety=== | ||
| − | Being a noble metal, it is non-toxic, though some of its compounds should be handled with care. | + | Being a noble metal, it is non-toxic, though some of its compounds should be handled with care, as they're toxic. |
===Storage=== | ===Storage=== | ||
Latest revision as of 21:39, 25 January 2019
| General properties | |||||
|---|---|---|---|---|---|
| Name, symbol | Platinum, Pt | ||||
| Appearance | Silvery white metal | ||||
| Platinum in the periodic table | |||||
| |||||
| Atomic number | 78 | ||||
| Standard atomic weight (Ar) | 195.084(9) | ||||
| Group, block | , d-block | ||||
| Period | period 6 | ||||
| Electron configuration | [Xe] 4f14 5d9 6s1 | ||||
per shell | 2, 8, 18, 32, 17, 1 | ||||
| Physical properties | |||||
| Silvery-white | |||||
| Phase | Solid | ||||
| Melting point | 2041.4 K (1768.3 °C, 3214.9 °F) | ||||
| Boiling point | 4098 K (3825 °C, 6917 °F) | ||||
| Density near r.t. | 21.45 g/cm3 | ||||
| when liquid, at | 19.77 g/cm3 | ||||
| Heat of fusion | 22.17 kJ/mol | ||||
| Heat of | 510 kJ/mol | ||||
| Molar heat capacity | 25.86 J/(mol·K) | ||||
| pressure | |||||
| Atomic properties | |||||
| Oxidation states | 6, 5, 4, 3, 2, 1, −1, −2, −3 (a mildly basic oxide) | ||||
| Electronegativity | Pauling scale: 2.28 | ||||
| energies |
1st: 870 kJ/mol 2nd: 1791 kJ/mol | ||||
| Atomic radius | empirical: 139 pm | ||||
| Covalent radius | 136±5 pm | ||||
| Van der Waals radius | 175 pm | ||||
| Miscellanea | |||||
| Crystal structure | Face-centered cubic (fcc) | ||||
| Speed of sound thin rod | 2800 m/s (at ) | ||||
| Thermal expansion | 8.8 µm/(m·K) (at 25 °C) | ||||
| Thermal conductivity | 71.6 W/(m·K) | ||||
| Electrical resistivity | 1.05·10-7 Ω·m (at 20 °C) | ||||
| Magnetic ordering | Paramagnetic | ||||
| Tensile strength | 125–240 MPa | ||||
| Young's modulus | 168 GPa | ||||
| Shear modulus | 61 GPa | ||||
| Bulk modulus | 230 GPa | ||||
| Poisson ratio | 0.38 | ||||
| Mohs hardness | 3.5 | ||||
| Vickers hardness | 400–550 MPa | ||||
| Brinell hardness | 300–500 MPa | ||||
| CAS Registry Number | 7440-06-4 | ||||
| History | |||||
| Discovery | Antonio de Ulloa (1748) | ||||
Platinum is a chemical element with the chemical symbol Pt and the atomic number 78. It is a valuable and useful transition metal, part of the so called "platinum group metals".
Contents
Properties
Chemical
Platinum is extremely resistant to organic and mineral acids. It will, however, dissolve extremely slowly in hot aqua regia, to give chloroplatinic acid.
- Pt + 4 HNO3 + 6 HCl → H2PtCl6 + 4 NO2 + 4 H2O
It will also be attacked by molten alkali and cyanides.
Physical
Platinum is a lustrous, ductile, and malleable, silver-white metal. It is more ductile than gold, but less malleable.
Availability
Although it can be bought from precious metal stores, platinum is also found in certain electronics and car exhaust catalysts. Electrodes are sometimes coated with platinum. Platinum can be obtained along with silver in small amounts from capacitors obtained through electronic recycling.
Platinum bullion can be bought, which has the advantage of having purity expressed accurately.
In Australia, platinum is classified as Category II precursor chemical and purchasing it requires and EUD.[1]
Isolation
Platinum can be extracted by dissolving it in aqua regia. The resulting chloroplatinic acid is converted to ammonium chloroplatinate by the addition of ammonium chloride, that can be reduced to platinum metal by heating it, usually in a hydrogen atmosphere. This results in a platinum sponge.
Projects
- Make chloroplatinic acid
- Make platinum electrodes
- Electrolysis
- Make chlorates and perchlorates
Handling
Safety
Being a noble metal, it is non-toxic, though some of its compounds should be handled with care, as they're toxic.
Storage
No special storage is required for storing platinum, though platinum electrodes should be kept away from sulfur oxides which can "poison" it.
Disposal
It's best to recycle platinum, considering it's a rare and expensive metal.
