why should distilled water be used when making chemical tests?
153653
Water from the tap has several ions in it.  Some are added by people (like fluorine) and some arent (like sodium).  Also, water from the tap has several impurities.  \n\nWhen water is distilled, it is purified.  This water is deionized (some people call it DI water).  The water is free of impurities.  Without impurities, chemical "tests" can be run very efficiently and effectively with water.
96492
a test for unsaturation. In organic compounds, the unsaturation is due to presence of double (C=C) or triple (CΞC) carbon bond. \nThe test is performed as follows: To 1 ml of the aqueous solution of the organic compound in a test tube is added an aquieous solution of bromine (bromine water) dropwise. The mixture is shaken after each addition. The decolourisation of bromine water shows the presence of unsaturation in the organic compound.\nIn case the organic compound is insoluble in water, the test is performed by using the solution of compound in carbon tetrachloride and adding dropwise a solution of bromine in carbon tetrachloride.
341828
Your question is incomplete and I do't know what you want to know about silica test in mineral water, whether you are curious if there is such a test? or whether you wish to know what is the test for silica in mineral water? or you are offering me silica test in mineral water?\n\nNever mind. I guess you want to know how silica can be tested in mineral water. I would do it by evaporating all the water from the sample and any solid residue is dissolved in acidified sodium fluoride. This gives SiF4 which is a gas and the gas is made to react with water to form white silicate solids. This is a good qualitative test but there are better tests using kits that can be bought. They use metals to bind with the silica.
895745
It depends on what kind of "cleaning solution" you're talking about.  The little bottles usually included with the mechanical disc cleaners/repairers aren't usually anything more than distilled water.
703999
it's usually filled with deionized H2O, used of course for washings (filtrate, precipitate, etc) or adding water to ur reaction system
162509
Dissolved mineral salts produce ions in most tap water.  The process of distillation evaporates pure water as steam and then recondenses it into liquid water as it cools.  The minerals and other impurities are left behind, so there won't be any ions in distilled water.
529595
The is no specific wet test that would involve reagents that you would be able to get.  They are pretty exotic reagents.  Much cheaper would be to take a sample to a local lab and pay $25 or so for a copper test.\n\nIf there are no other metals believed present, you can do this.  Take the solution or solids and acidify until dissolved. Filter any solids left and decant.  Add ammonium hydroxide (15M) to the decant until the solution is slightly basic.  If the solution is not blue, copper is not present in more than trace levels.  If it is blue, add acetic acid (5M) dropwise until the blue color just disappears.  Then add 2 drops of 0.2M K4Fe(CN)6.  The formation of a red solid confirms the presence of copper.  Note this only works if copper is the only metal above impurity levels.\n\nTo see if chloride is present gets very complicated by wet methods.
1171846
it depend on your solution. if your solvent was water you have some solids that disperse in it with different rate and different quality for more detect the solution(solvent) and contact me
972593
Flame tests are "OK" when you are dealing with a reasonably pure solution.  If there are more than one cation present, such as sodium and potassium, then the resultant color in the flame will not be so determinant.  Also, if you are color blind flame tests suck.
621304
If you are dealing with a reaction involving ammonium carbonate in solution, and are then measuring the temperature rise, you need the heat capacity of water, not ammonium carbonate!\n\nPlease post the whole problem if that is not enough to get you started.
439640
Yes definitely! This is for the simple reason:-Tap water is likely to contain dissolved salts, and other impurities. But distilled water contains only water, and hence better.
990083
You don't give us which lab you are doing, so results would be hard to find..  For general information, do a good web search with the name of what you distilled.  I don't think you will find everything you want, but there is a large number of websites on the general subject.
570220
no. Cooled steam is distilled water
822058
ABSOLUTELY NOT.. Distilled water has no minerals.. nothing and plants need minerals, etc that it gets from water...normal water
1082160
Those processes take special equipment. But generally, one takes a sample, boils it with the addition of either a solvent or an acid (depending what one is extracting) which releases the oils. From there, the solution may have to be dried, distilled, separated, or all three. HOWEVER, it absolutely requires that specialized equipment. ATTEMPTING an extraction without the right tools, protective gear, chemicals, forethought, planning, procedure, technique, and disposal could result in not only undesired products, but health concerns and issues ranging from burns, loss of conciousness, poisoning, carcenogenic effects, and even loss of life. It is highly not recommended to undertake the procedure if any  of these requisites are missing or lacking.
774882
Basically a DM (demineralizing) plant works to take the mineral content of the liquid down to some level that is acceptable for consumption. This MAY mean all the way down to where there are no minerals left, by the way!\n\nChemical additives (like acids, bases, or even other metals) are blended with the water as it progresses from stage to stage, with the resulting chemical reactions creating non-soluble byproducts and "purer" water.\n\nThe process is repeated in as many stages as necessary to reduce the water to its required purity.\n\nThis is a very simplified version, but it may be enough to suit your needs.
441642
What about adding in another....Disstilled water, which can be caught using a container when it rains or via a disstilling machine or you can buy it now off the shelf. This is water in it's purest form!!!