Water

Chemical properties

colourless liquid

The Uses of Water

For use in the preparation of cell culture media, and cell suspension and washing solutions.

The Uses of Water

For use in embryo manipulation.

The Uses of Water

water is listed also as catalyzed, deionized, demineralized, distilled, pure spring, and purified water. Water is an important skin component and is essential for its proper functioning. It is the most common ingredient used in cosmetic formulations and, therefore, is generally listed first on product labels. Water is usually processed to eliminate hardness and minerals, and to avoid product contamination.

The Uses of Water

Water is a colorless, odorless, tasteless liquid formed by the combi- nation of two hydrogen and one oxygen atoms. it allows substances to dissolve and functions as a solvent, dispersing medium, hydrate, and promoter of chemical changes. it is a major constituent in meats, fruits, and vegetables. distilled water is obtained by conden- sation of water vapor.

Background

Water (chemical formula: H2O) is a transparent fluid which forms the world's streams, lakes, oceans and rain, and is the major constituent of the fluids of organisms. As a chemical compound, a water molecule contains one oxygen and two hydrogen atoms that are connected by covalent bonds. Water is a liquid at standard ambient temperature and pressure, but it often co-exists on Earth with its solid state, ice; and gaseous state, steam (water vapor).

What are the applications of Application

Water, DEPC-Treated is a ready to use, sterile filtered RNase-free water for reconstitution of lyophilized products.

What are the applications of Application

ddWater (endotoxin-free) is sterile, double distilled endotoxin-free water

What are the applications of Application

Water with 0.1% ammonium acetate is A pre-made HPLC solvent for use in analytical chromatography

What are the applications of Application

Water, HPLC is useful for HPLC studies

Indications

For diluting or dissolving drugs for intravenous, intramuscular or subcutaneous injection, according to instructions of the manufacturer of the drug to be administered [FDA Label].

Definition

ChEBI: An oxygen hydride consisting of an oxygen atom that is covalently bonded to two hydrogen atoms.

General Description

Water is widely used for HPCE (High-Performance Capillary Electrophoresis), luminescence and UV-spectroscopic studies.

Metabolism

Not Available

Purification Methods

Conductivity water (specific conductance ca 10-7 mho) can be obtained by distilling water in a steam-heated tin-lined still, then, after adding 0.25% of solid NaOH and 0.05% of KMnO4, distilling once more from an electrically heated Barnstead-type still, taking the middle fraction into a Jena glass bottle. During these operations suitable traps must be used to protect against entry of CO2 and NH3. Water, only a little less satisfactory for conductivity measurements (but containing traces of organic material) can be obtained by passing ordinary distilled water through a mixed bed ion-exchange column containing, for example, Amberlite resins IR 120 (cation exchange) and IRA 400 (anion exchange), or Amberlite MB-1. This treatment is also a convenient one for removing traces of heavy metals. (The metals Cu, Zn, Pb, Cd and Hg can be tested for by adding pure concentrated ammonia to 10mL of sample and shaking vigorously with 1.2mL of 0.001% dithizone in CCl4. Less than 0.1Yg of metal ion will impart a faint colour to the CCl4 layer.) For almost all laboratory purposes, simple distillation yields water of adequate purity, and most of the volatile contaminants such as ammonia and CO2 are removed if the first fraction of distillate is discarded. Most laboratories have glass stills that “doubly” or “trebly” distil water. [See “water” in Chapter 1.]