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carbon dioxide (1 Viewer)
- Thread starter xeriphic
- Start date
also i have some questions about this
provide information about the range of chemical procedures which can be used to clean, stabilise and preserve artefacts from shipwrecks
from above i was wondering where it says clean it means the same as restore right, also are the methods used to clean artefacts from shipwrecks different to those artefacts recovered elsewhere, since it specifically asked about shipwrecks
provide information about the range of chemical procedures which can be used to clean, stabilise and preserve artefacts from shipwrecks
from above i was wondering where it says clean it means the same as restore right, also are the methods used to clean artefacts from shipwrecks different to those artefacts recovered elsewhere, since it specifically asked about shipwrecks
uhm, i assume you mean react with water???
then yes, co2 dissolve in water to form an equilibrium to form carbonic acid h2co3, a weak acid..
my interpretation is: both clean and stablizing would be refering to the restoration of the artefact... artefacts from shipwrecks would contain a high level of ions... so care must be taken - eg, not leavin it on the dock or it will crack etc etc....
thanks for clarifying that up, wasn't sure what i'm writting is correct
also i am not sure about these two sentences
"for iron objects dilute sodium hydroxide solution is generally used instead of pure water in the process of leaching: it speeds up the removal of chloride because it converts iron chloride to iron hydroxide which release chloride"
then it says a paragraph down
"it is very difficult to remove chloride from iron by leaching, it appears that considerable amounts of chloride are present as insoluble hydroxy chlorides such as Fe(OH)Cl trapped in Fe(OH)2 and Fe2O3.xH2O deposits"
my question is, so for iron objects is the process of leaching actually valid, also how does it actually occur
i summerised both sentences and came up with this
The method of leaching can also be used for the removal of chloride from iron where pure water is replaced with dilute sodium hydroxide solution. This speeds up the process as FeCl2 converts into Fe(OH)2 and releases chloride. However considerable amounts of chloride are present as insoluble hydroxy chlorides such as Fe(OH)Cl trapped in Fe(OH)2 and Fe2O3.xH2O deposits which may not be totally removed causing further corrosion
^ is the above right, i am not sure
also i am not sure about these two sentences
"for iron objects dilute sodium hydroxide solution is generally used instead of pure water in the process of leaching: it speeds up the removal of chloride because it converts iron chloride to iron hydroxide which release chloride"
then it says a paragraph down
"it is very difficult to remove chloride from iron by leaching, it appears that considerable amounts of chloride are present as insoluble hydroxy chlorides such as Fe(OH)Cl trapped in Fe(OH)2 and Fe2O3.xH2O deposits"
my question is, so for iron objects is the process of leaching actually valid, also how does it actually occur
i summerised both sentences and came up with this
The method of leaching can also be used for the removal of chloride from iron where pure water is replaced with dilute sodium hydroxide solution. This speeds up the process as FeCl2 converts into Fe(OH)2 and releases chloride. However considerable amounts of chloride are present as insoluble hydroxy chlorides such as Fe(OH)Cl trapped in Fe(OH)2 and Fe2O3.xH2O deposits which may not be totally removed causing further corrosion
^ is the above right, i am not sure