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11-SEPTEMBER-2008 13:54:10 - Electrolyte An electrolyte is any substance containing free ions that behaves as an electrically conductive medium. Because they generally consist of ions in solution, electrolytes are also known as ionic solutions, but molten electrolytes and solid electrolytes are also possible. They are sometimes referred to in abbreviated jargon as lytes. Contents 1 Principles 2 Physiological importance 2.1 Measurement 2.2 Sports drinks 3 Electrochemistry 4 See also Principles Electrolytes commonly exist as solutions of acids, bases or salts. Furthermore, some gases may act as electrolytes under conditions of high temperature or low pressure. Electrolyte solutions can also result from the dissolution of some biological e.g. DNA, polypeptides and synthetic polymers e.g. polystyrene sulfonate, termed polyelectrolytes, which contain multiple charged moieties. Electrolyte solutions are normally formed when a salt is placed into a solvent such as water and the individual components dissociate due to the thermodynamic interactions between solvent and solute molecules, in a process called solvation. For example, when table salt, NaCl, is placed in water, the following occurs: NaCls → Na+ + Cl- It is also possible for substances to react with water when they are added to it, producing ions, e.g. carbon dioxide gas dissolves in water to produce a solution which contains hydrogen ions and bicarbonate ions. In simple terms, the electrolyte is a material that dissolves in water to give a solution that conducts an electric current. Note that molten salts can be electrolytes as well. For instance, when sodium chloride is molten, the liquid conducts electricity. An electrolyte in a solution may be described as concentrated if it has a high concentration of ions, or dilute if it has a low concentration. If a high proportion of the solute dissociates to form free ions, the electrolyte is strong; if most of the solute does not dissociate, the electrolyte is weak. The properties of electrolytes may be exploited using electrolysis to extract constituent elements and compounds contained within the solution. Physiological importance In physiology, the primary ions of electrolytes are sodium Na+, potassium K+, calcium Ca2+, magnesium Mg2+, chloride Cl-, hydrogen phosphate HPO42-, and hydrogen carbonate HCO3-. The electric charge symbols of plus + and minus - indicate that the substance in question is ionic in nature and has an imbalanced distribution of electrons, which is the result of chemical dissociation. All higher lifeforms require a subtle and complex electrolyte balance between the intracellular and extracellular milieu. In particular, the maintenance of precise osmotic gradients of electrolytes is important. Such gradients affect and regulate the hydration of the body, blood pH, and are critical for nerve and muscle function. Various mechanisms exist in living species that keep the concentrations of different electrolytes under tight control. Both muscle tissue and neurons are considered electric tissues of the body. Muscles and neurons are activated by electrolyte activity between the extracellular fluid or interstitial fluid, and intracellular fluid. Electrolytes may enter or leave the cell membrane through specialized protein structures embedded in the plasma membrane called ion channels. For example, muscle contraction is dependent upon the presence of calcium Ca2+, sodium Na+, and potassium K+. Without sufficient levels of these key electrolytes, muscle weakness or severe muscle contractions may occur. Electrolyte balance is maintained by oral, or in emergencies, intravenous IV intake of electrolyte-containing substances, and is regulated by hormones, generally with the kidneys flushing out excess levels. In humans, electrolyte homeostasis is regulated by hormones such as antidiuretic hormone, aldosterone and parathyroid hormone. Serious electrolyte disturbances, such as dehydration and overhydration, may lead to cardiac and neurological complications and, unless they are rapidly resolved, will result in a medical emergency. Measurement Measurement of electrolytes is a commonly performed diagnostic procedure, performed via blood testing with ion selective electrodes or urinalysis by medical technologists. The interpretation of these values is somewhat meaningless without analysis of the clinical history and is often impossible without parallel measurement of renal function. Electrolytes measured most often are sodium and potassium. Chloride levels are rarely measured except for arterial blood gas interpretation since they are inherently linked to sodium levels. One important test conducted on urine is the specific gravity test to determine the occurrence of electrolyte imbalance. Sports drinks Electrolytes are commonly found in sports drinks. In oral rehydration therapy, electrolyte drinks containing sodium and potassium salts replenish the body's water and electrolyte levels after dehydration caused by exercise, diaphoresis, diarrhea, vomiting, intoxication or starvation. It is unnecessary to replace losses of sodium, potassium and other electrolytes during exercise since it is unlikely that a significant depletion of the body's stores of these minerals will occur during normal training. However, in extreme exercising conditions over 5 or 6 hours an Ironman or ultramarathon, for example the consumption of a complex sports drink with electrolytes is recommended.-Elizabeth Quinn, trainer and health professional 1 Athletes who do not consume electrolytes under these conditions risk overhydration or hyponatremia. Because sports drinks typically contain very high levels of sugar, they are not recommended for regular use by children. Water is considered the only essential beverage for children during exercise. Medicinal rehydration sachets and drinks are available to replace the key electrolyte ions lost during diarrhea and other gastro-intestinal distresses. Dentists recommend that regular consumers of sports drinks observe precautions against tooth decay. Electrolyte and sports drinks can be home-made by using the correct proportions of sugar, salt and water.2 Electrochemistry Main article: electrolysis When electrodes are placed in an electrolyte and a voltage is applied, the electrolyte will conduct electricity. Lone electrons normally cannot pass through the electrolyte; instead, a chemical reaction occurs at the cathode consuming electrons from the cathode, and another reaction occurs at the anode producing electrons to be taken up by the anode. As a result, a negative charge cloud develops in the electrolyte around the cathode, and a positive charge develops around the anode. The ions in the electrolyte move to neutralize these charges so that the reactions can continue and the electrons can keep flowing. For example, in a solution of ordinary salt sodium chloride, NaCl in water, the cathode reaction will be 2H2O + 2e- → 2OH- + H2 and hydrogen gas will bubble up; the anode reaction is 2H2O → O2 + 4H+ + 4e- and oxygen gas will be liberated. The positively charged sodium ions Na+ will react towards the cathode neutralizing the negative charge of OH- there, and the negatively charged chlorine ions Cl- will react towards the anode neutralizing the positive charge of H+ there. Without the ions from the electrolyte, the charges around the electrode would slow down continued electron flow; diffusion of H+ and OH- through water to the other electrode takes longer than movement of the much more prevalent salt ions. In other systems, the electrode reactions can involve the metals of the electrodes as well as the ions of the electrolyte. Electrolytic conductors are used in electronic devices where the chemical reaction at a metal/electrolyte interface yields useful effects. In batteries, two metals with different electron affinities are used as electrodes; electrons flow from one electrode to the other outside of the battery, while inside the battery the circuit is closed by the electrolyte's ions. Here the electrode reactions convert chemical energy to electrical energy. In some fuel cells, a solid electrolyte or proton conductor connects the plates electrically while keeping the hydrogen and oxygen fuel gases separated. In electroplating tanks, the electrolyte simultaneously deposits metal onto the object to be plated, and electrically connects that object in the circuit. In operation-hours gauges, two thin columns of mercury are separated by a small electrolyte-filled gap, and, as charge is passed through the device, the metal dissolves on one side and plates out on the other, causing the visible gap to slowly move along. In electrolytic capacitors the chemical effect is used to produce an extremely thin 'dielectric' or insulating coating, while the electrolyte layer behaves as one capacitor plate. In some hygrometers the humidity of air is sensed by measuring the conductivity of a nearly dry electrolyte. Hot, softened glass is an electrolytic conductor, and some glass manufacturers keep the glass molten by passing a large current through it. See also Strong electrolyte Ionic atmosphere Retrieved from http://en..org/wiki/Electrolyte Categories: Electrochemistry | Blood tests | Urine tests | Physical chemistry | Physiology | Electrical conductors Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages العربية БългарÑ?ки Català Česky Dansk Deutsch Eesti Español Esperanto Français í•œêµì–´ Hrvatski Ido Bahasa Indonesia Ã?slenska Italiano עברית LatvieÅ¡u Magyar Bahasa Melayu Nederlands 日本語 ‪Norsk bokmÃ¥l‬ Polski Português РуÑ?Ñ?кий SlovenÄ?ina SlovenÅ¡Ä?ina СрпÑ?ки / Srpski Srpskohrvatski / СрпÑ?кохрватÑ?ки Suomi Svenska ไทย УкраїнÑ?ька ä¸æ–‡ This page was last modified on 9 September 2008, at 20:04
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