what kind of water must be used in chemical analysis purposes and why?
84238
Deionized water (known as "DI water" in labs) is used in chemical analysis.  When performing analytical chemistry, you don't want your water contaminated with the typical minerals you find in drinking water.  You just want pure H2O.
866201
water itself, of course.\nThe following ions.....\niron ions, calcium ions, sodium ions, chloride ions, fluoride ions...\n\noxygen molecules, carbon dioxide molecules, sometimes around here hydrogen sulfide molecules.\n\nALMOST EVERYTHING is in water in minute concentrations.
628336
as opposed to polluted water?
350106
You will need Chlorine gas. Due to the common ion effect the salt(Sodium Chloride) will precipitate out leaving the fresh water.\nMaterials Needed:\nChlorine gas\nSalt Water
425555
this depends on what you analysis is for.\n\nI presume you are using HCl and HNO3 (this mixture is aqua regia, and is an old mixture used by alchemists to dissolve metals) which would produce a solution containing metals contained in the flyash. This is the safest method.\n\nFurther analysis for getting rid of organics and further getting to the metals (flyash is made of coal) is also dangerous, as it uses H3PO4 and HNO3, this combination if heated is explosive so should be done by experienced chemists.\n\nNow... if you want to analyise the actual organic components in flyash then this beocmes more difficult as you now are dealing with highly complex organic structures... you should be careful with acid as it could destroy a lot of the flyash molecules. Such analysis is complicated, requiring many steps.
444550
The difference in solubility of the components allows for separation.  I don't remember the specifics, but that is the reason.  Water will not have a big enough difference.
535014
In short, no.\n\nAs a science, chemistry is usually separated into four main categories: organic, inorganic, physical, and analytical.  Analytical chemistry deals with detection, structural elucidation of chemical compounds, and instrumentation.  \n\nA chemical analysis is used to refer to a battery of tests that are performed on a given sample.
971873
The ones that I use in testing precious stones are :-\n1) Bromoform - Density of 2.90 and can be diluted with toluol.\n2) Acetylene tetrabromide - D. = 2.95 can be diluted with toluol.\n3) Sonstadt's solution. Saturated solution of potassium mercuric iodide in water D. = 3.18 can be diluted with water.\n4)Klein's solution. Saturated solution of cadmium boro-tungstate in water D. = 3.28 can be diluted with water. \n5) Methylene iodide (CH2I2) D = 3.32 can be diluted with toluol\n6) Rohrbach's solution Saturated Barium mercuric iodide in water D.= 3.58\n7)Methylene iodide with dissolved iodine and iodoform D = 3.6\n8) Clerici's solution Saturated solution of thallium manolate and thallium formate in water D = 4.15 can be diluted with water.\n\nAll of these liquids are POISON and most give off noxious fumes so they must be handled with great care.\nThey are also, I regret to say very expensive.
893507
What about the substances USED for water treatment?  If there are effective and safe water treatment, handy substances , that would be ideal to market.  Everyone wants to have their own "substance" to "treat" their water/ if you know what I mean.
421615
It depends on which method you are talking about and the end use of the water.  For drinking water they are strictly monitored.  For industrial reuse, you try to balance cost and quality so you can have problems.
576198
Ozone can be used for bleaching substances and for killing bacteria. Many municipal drinking water systems kill bacteria with ozone instead of the more common chlorine. Ozone does not form organochlorine compounds, but it also does not remain in the water after treatment, so some systems introduce a small amount of chlorine to prevent bacterial growth in the pipes, or may use chlorine intermittently, based on results of periodic testing. Where electrical power is abundant, ozone is a cost-effective method of treating water, as it is produced on demand and does not require transportation and storage of hazardous chemicals. Once it has decayed, it leaves no taste or odor in drinking water.\n\nIndustrially, ozone or ozonated water is used to:\n\ndisinfect water before it is bottled, \nkill bacteria on food-contact surfaces \nscrub yeast and mold spores from the air in food processing plants \nwash fresh fruits and vegetables to kill yeast, mold and bacteria \nchemically attack contaminants in water (iron, arsenic, hydrogen sulfide, nitrites, and complex organics lumped together as "color"), \nprovide an aid to flocculation (a process of agglomeration of molecules, which aids in filtration... this is where the iron and arsenic are removed), \nclean and bleach fabrics (the latter use is patented), \nassist in processing plastics to allow adhesion of inks, \nage rubber samples to determine the useful life of a batch of rubber. \nUsed in surface water treatment plants to eradicate bacteria such as Giardia and Cryptosporidium. This process is known as ozonation.
1108709
Safe to drink... or safe to be around in the presence of an electrical current?\n\nWell zero conductivity would be ideal, because it would be evidence of zero ion presence in the water.\n\nHowever the water could be very conductive and still be "safe" to consume. Salt (Na-Cl) for instance mixed into the water would make turn the water into an ionic solution. It is therefore now has conductivity. But as we all know... we can consume salt water "safely" if it is consumed at appropriate amounts.
1013254
This water is called hard water. This water is rich in Calcium. If the water's hardness is measured as 1000ppm CaCO3, such type of phenomenon is common. For potable water, the hardness should be less than 200ppm CaCO3. In regions of India with calcareous soil and subsoil, the under ground water is of this type. The inner wall of the tubes of the pump existing in these areas gets accumulated with the CaCO3 and in due course of time, the diameter of the tube gets reduced and finally, the whole tube gets clogged with CaCO3. This type of water should not be used for drinking purposes because, it may create kidney problems. Such type of hard water will not surf with soap.
1043394
Of course you must specify whether you want the thermodynamic properties of water (or chewing gum?).  Good luck.
203892
Distill the water. The WATER comes out of the tubes, not the salt.\n    As for testing, just drink a little of it. Do you *LIKE* it?\nNo? Well you better make sure that you don't put it back in the same cup you used for collection.\nOK the water will still pass an electric current through it if it has any impurities. Completely pure water will not.\nUnless you use more than around one volt, in which case the bubbles you see escaping will be hydrogen and oxygen. That means you've gone too far with the testing part.
873270
depends on if you tap water contains chlorine or not.\nif it does than let it sit out for 24 hours before using it on a plant.\n\n\npersonally i use well water.\n\ndistilled water would probably leach minerals from the soil as it drains through.
460809
If you own a single family (domestic) well, it is recommended that you test your water every three years for nitrates; more often if you live in an area with a history of high nitrate levels or if someone in your home is at risk from nitrate contamination. \n\n Reverse osmosis, ion exchange and distillation units could conceivably provide home treatment for removing nitrates from water, but those processes can be complicated, expensive, and generally require routine maintenance. Activated carbon and other simple filters do not remove nitrates to any significant degree. Home treatment units are generally not recommended, particularly as a permanent solution to assure nitrate-free water for infant use.