PuzzelsVoor het pws van havo 5 sk wil ik hebben over mummificatie.
"In de Egyptische traditie werd het lichaam in vaste natron te leggen. Natron is een mengsel van zout en natriumwaterstofcarbonaat (natriumbicarbonaat) dat wordt gevonden aan de randen van geconcentreerde zoutmeren in de Egyptische woestijn. "
" Natron is in het dagelijks spraakgebruik een mengsel van natriumwaterstofcarbonaat (natriumbicarbonaat) en natriumcarbonaat (soda)".
Beide beschrijvingen hebben het over natron dat gebruikt wordt voor mummificatie. Wat is natron? en hoe verhouden de diverse zouten zich in dit mengsel dat natron genoemd wordt?
mummificatie
Moderator: Marko
Forumregels
(Middelbare) school-achtige vragen naar het forum "Huiswerk en Practica" a.u.b.
Zie eerst de Huiswerkbijsluiter
(Middelbare) school-achtige vragen naar het forum "Huiswerk en Practica" a.u.b.
Zie eerst de Huiswerkbijsluiter
ads
Steun Sciencetalk
Screenprotector Geschikt voor Samsung A56 Screen protector Tempered Gehard galaxy glas - 2 stuks beschermglas
Re: mummificatie
Natron - Mummy Mineral
Ancient Egyptians were famous for their perfection of the art of mummification. A key ingredient in the process is a mineral called natron, whose preservative properties rival those of salt.
Natron is a sodium carbonate (Na2CO3.10H20) which crystallizes in the monoclinic system. It commonly forms clear, white, yellow or gray crusts of granular or columnar crystals. It dissolves in water and also absorbs water readily, making it an excellent desiccant. Natron is found in quantity naturally in the beds of several Egyptian playa lakes. It forms when lake water of a particular composition evaporates, as it would happen periodically in the hot Egyptian climate. Natron does not form from the evaporation of sea water, where most of the sodium present would be tied up as halite (NaCl). Its preservative qualities must have been immediately apparent from its effects on wild life which drowned in these lakes. At several Egyptian localities ( Wadi Natrun and Behiera in the Libyan desert and El Kab in Upper Egypt) the natron has accumulated in beds and incrustations several feet thick. This material has been mined and traded from these localities for thousands of years. Egyptian writings as old as the reign of Ramese III (1198-1166 B.C.) refer to these deposits. There is some evidence that the natron was artificially precipitated by isolating shallow basins of lake water for faster evaporation.
The natron was a preferred material for mummy purification and preservation. Natron is superior to salt as a drying agent because it chemically attacks and destroys grease and fat. It is found not only in tombs and in pits with other discarded embalming materials, but also as nodules and residues in the mummies themselves. There is some debate over the method in which the natron was used. It may have been used in a way similar to the method for the preservation of fish. Dry natron would be sprinkled over the body, perhaps with sawdust, or spread with linen clothes. Other archeologists believe the body was immersed in vats containing a natron solution. Such a wet method would however be odiferous, accelerate putrefaction and thus be counterproductive to the preservation of the body. A dry body would also be more readily bandaged as well as more amenable to the attachment of amulets and other jewelry.
Although mummification has supernatural trappings, its basis is rooted in simple chemistry and processes as mundane as fish preservation. It also is another example of a technology born out of observations of the properties and effects of rare minerals.
Ancient Egyptians were famous for their perfection of the art of mummification. A key ingredient in the process is a mineral called natron, whose preservative properties rival those of salt.
Natron is a sodium carbonate (Na2CO3.10H20) which crystallizes in the monoclinic system. It commonly forms clear, white, yellow or gray crusts of granular or columnar crystals. It dissolves in water and also absorbs water readily, making it an excellent desiccant. Natron is found in quantity naturally in the beds of several Egyptian playa lakes. It forms when lake water of a particular composition evaporates, as it would happen periodically in the hot Egyptian climate. Natron does not form from the evaporation of sea water, where most of the sodium present would be tied up as halite (NaCl). Its preservative qualities must have been immediately apparent from its effects on wild life which drowned in these lakes. At several Egyptian localities ( Wadi Natrun and Behiera in the Libyan desert and El Kab in Upper Egypt) the natron has accumulated in beds and incrustations several feet thick. This material has been mined and traded from these localities for thousands of years. Egyptian writings as old as the reign of Ramese III (1198-1166 B.C.) refer to these deposits. There is some evidence that the natron was artificially precipitated by isolating shallow basins of lake water for faster evaporation.
The natron was a preferred material for mummy purification and preservation. Natron is superior to salt as a drying agent because it chemically attacks and destroys grease and fat. It is found not only in tombs and in pits with other discarded embalming materials, but also as nodules and residues in the mummies themselves. There is some debate over the method in which the natron was used. It may have been used in a way similar to the method for the preservation of fish. Dry natron would be sprinkled over the body, perhaps with sawdust, or spread with linen clothes. Other archeologists believe the body was immersed in vats containing a natron solution. Such a wet method would however be odiferous, accelerate putrefaction and thus be counterproductive to the preservation of the body. A dry body would also be more readily bandaged as well as more amenable to the attachment of amulets and other jewelry.
Although mummification has supernatural trappings, its basis is rooted in simple chemistry and processes as mundane as fish preservation. It also is another example of a technology born out of observations of the properties and effects of rare minerals.
-
Napoleon1981
- Artikelen: 0
- Berichten: 2.399
- Lid geworden op: wo 29 dec 2004, 14:37
Re: mummificatie
Misschien wel zo netjes om de bron te vermelden?
-
Nathalie_CF
- Artikelen: 0
- Berichten: 7
- Lid geworden op: di 03 okt 2006, 10:59
Re: mummificatie
Hoii, ik en mijn vriendin gaan onze pws ook over mummificatie doen! dus misschien kunnen we een beetje samenwerken met info verzamelen ofzo... wij zijn nu vooral nog op zoek naar een goed experiment hierbij, en hebben hier hulp bij van een student van de universiteit van Utrecht. Heb jij al een experiment bedacht?
-
Gerard
- Artikelen: 0
Re: mummificatie
Nathalie, refereer volgende keer ook aan je eigen topic mischien heeft Ronald er ook wat aan.
http://www.chemieforum.nl/forum/index.php?...hl=mummificatie
http://www.chemieforum.nl/forum/index.php?...hl=mummificatie
-
Nathalie_CF
- Artikelen: 0
- Berichten: 7
- Lid geworden op: di 03 okt 2006, 10:59
Re: mummificatie
ow ja sorry vergeten! maar ik heb nog een hele goede site gevonden, misschien heb jij der ook wat aan:
http://www.kennislink.nl/web/show?id=6213
http://www.kennislink.nl/web/show?id=6213
Re: mummificatie
Mmm, ik zou niet graag in de schoenen van die student staan...wij zijn nu vooral nog op zoek naar een goed experiment hierbij, en hebben hier hulp bij van een student van de universiteit van Utrecht. Heb jij al een experiment bedacht?
-
Nathalie_CF
- Artikelen: 0
- Berichten: 7
- Lid geworden op: di 03 okt 2006, 10:59
Re: mummificatie
Ga ff wat nuttigs doen ofzo marjanne.....
<table border='0' align='left' cellpadding='3' cellspacing='0'><tr><td padding='0' celspacing='0' align='left'><font size='1'># Moderatoropmerking</font></td></tr><tr><td id='moderator'><font size='1'>rwwh: gevoel voor humor misstaat niet. Marjanne is één van de meest productieve beantwoorders van het forum, ik zou niet graag zien dat ze iets anders nuttiger zou vinden</font></td></tr></table>
<div class='postcolor'>
<table border='0' align='left' cellpadding='3' cellspacing='0'><tr><td padding='0' celspacing='0' align='left'><font size='1'># Moderatoropmerking</font></td></tr><tr><td id='moderator'><font size='1'>rwwh: gevoel voor humor misstaat niet. Marjanne is één van de meest productieve beantwoorders van het forum, ik zou niet graag zien dat ze iets anders nuttiger zou vinden</font></td></tr></table>
<div class='postcolor'>
ads
Re: mummificatie
Hij was in ieder geval raak...
