Can we use table salt to prepare 3.5 wt.% NaCl water solution for corrosion experiments. The 3.5 wt.% is to simulate sea water conditions. Researchers usually go with 3.5 wt.%.
Yes table salt is a common example of NaCl, but bare in mind it contains other elements to replenish it, eg Iodine. For research purposes try the purchase and use of laboratory grade NaCl, which is readily available.
Thomas Breuer
I am going to use laboratory grade NaCl. However the water that I use will be distilled water. When papers say "3.5 wt.% NaCl", I guess the water must be pure with only additive being NaCl.
You can use sea salt available in many stores. It is produced from seawater by the evaporation of H2O, so when added water, it will accurately simulate the behavior of real seawater.
Dear Dr. Muralishwara Kakunje ,
for the corrosion tests a solution in deionized water of NaCl 3.5% by weight is very often used. Sometimes in even higher concentrations for example 5% in a salt spray chamber or even up to about 10% in other experiments. Depending on the type of measurement, a different degree of purity of the NaCl reagent is required; without reaching exaggerated degrees of purity it is still necessary that it be classified as a laboratory reagent, so that other researchers can use similar solutions and obtain results as standardized as possible. Kitchen salt also contains other chemical compounds and I would not consider it suitable for tests for research use and / or measurements according to specific regulations.
Best regards, Pierluigi Traverso.
Dear Muralishwara Kakunje,
Although table salt is composed of mainly NaCl, still it contains other (bodily useful) minerals too. Hence, just adding 3.5 wt.% table salt will not help you to get a simulated sea water composition. For this purpose, a simple way is that you should purchase a research grade NaCl powder from market and dissolve it in de-ionized water.
Also, for a better simulation of sea water condition, you can go through the below mentioned link which would provide you with the approximate composition of sea water, in terms of ASTM D1141-98 standards:
- https://www.artificialseawater.com/products/-artificial-seawater-astm-d-1141-98?gclid=Cj0KCQiA6Or_BRC_ARIsAPzuer9zJJXh31UrUhG0ix6raas123NDOw_ExuBqm6S4GJAe_ygfzcKpfnAaAusYEALw_wcB
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