Miss Fong: Correct. The air we breathe contains different elements and compounds, like nitrogen, oxygen, argon, carbon dioxide, as well as trace amounts of others, like methane and nitrogen oxides. Next up, helium, like in these balloons. The attraction between the Na + and Cl − ions in the solid is so strong that only highly polar solvents like water dissolve NaCl well. In Judaism, it is recommended to have either a salty bread or to add salt to the bread if this bread is unsalted when doing Kiddush for Shabbat. It is customary to spread some salt over the bread or to dip the bread in a little salt when passing the bread around the table after the Kiddush. [99] To preserve the covenant between their people and God, Jews dip the Sabbath bread in salt. [92]

Roskill Information Services". Roskill.com. 30 March 2011. Archived from the original on 18 June 2003 . Retrieved 7 July 2011. a b Stumm, W, Morgan, J. J. (1981) Aquatic Chemistry, An Introduction Emphasizing Chemical Equilibria in Natural Waters. John Wiley & Sons. pp. 414–416. ISBN 0471048313. Miss Fong: Today we're going to be looking at pure and impure substances and how we can test for purity.Sodium chloride is used in the Solvay process to produce sodium carbonate and calcium chloride. Sodium carbonate, in turn, is used to produce glass, sodium bicarbonate, and dyes, as well as a myriad of other chemicals. In the Mannheim process, sodium chloride is used for the production of sodium sulfate and hydrochloric acid. Pennington, Matthew (25 January 2005). "Pakistan salt mined old-fashioned way mine". The Seattle Times. Archived from the original on 25 July 2012 . Retrieved 11 October 2013. So, drinking a glass of water with some salt can be beneficial if you've been working out in extreme heat and lost a lot of sweat. a b c He, F.J.; Li, J.; Macgregor, G.A. (3 April 2013). "Effect of longer term modest salt reduction on blood pressure: Cochrane systematic review and meta-analysis of randomised trials". BMJ (Clinical Research Ed.). 346: f1325. doi: 10.1136/bmj.f1325. PMID 23558162. Most oceangoing vessels desalinate potable water from seawater using processes such as vacuum distillation or multi-stage flash distillation in an evaporator, or, more recently, reverse osmosis. These energy-intensive processes were not usually available during the Age of Sail. Larger sailing warships with large crews, such as Nelson's HMS Victory, were fitted with distilling apparatus in their galleys. [42]

Drinking too much salt water can also have health risks, such as calcium deficiency and high blood pressure.In most open waters concentrations vary somewhat around typical values of about 3.5%, far higher than the body can tolerate and most beyond what the kidney can process. A point frequently overlooked in claims that the kidney can excrete NaCl in Baltic concentrations of 2% (in arguments to the contrary) is that the gut cannot absorb water at such concentrations, so that there is no benefit in drinking such water. The salinity of Baltic surface water, however, is never 2%. It is 0.9% or less, and thus never higher than that of bodily fluids. Drinking seawater temporarily increases blood's NaCl concentration. This signals the kidney to excrete sodium, but seawater's sodium concentration is above the kidney's maximum concentrating ability. Eventually the blood's sodium concentration rises to toxic levels, removing water from cells and interfering with nerve conduction, ultimately producing fatal seizure and cardiac arrhythmia. [ citation needed] Sodium ferrocyanide, also known as yellow prussiate of soda, is sometimes added to salt as an anticaking agent. [46] [47] Such anticaking agents have been added since at least 1911 when magnesium carbonate was first added to salt to make it flow more freely. [48] The safety of sodium ferrocyanide as a food additive was found to be provisionally acceptable by the Committee on Toxicity in 1988. [46] Other anticaking agents sometimes used include tricalcium phosphate, calcium or magnesium carbonates, fatty acid salts ( acid salts), magnesium oxide, silicon dioxide, calcium silicate, sodium aluminosilicate and calcium aluminosilicate. Both the European Union and the United States Food and Drug Administration permitted the use of aluminium in the latter two compounds. [49] Klewe, B; Pedersen (1974). "The crystal structure of sodium chloride dihydrate". Acta Crystallogr. B30 (10): 2363–2371. doi: 10.1107/S0567740874007138.