A strong electrolyte is a solute

Solution

In chemistry, a solution is a homogeneous mixture composed of only one phase. In such a mixture, a solute is dissolved in another substance, known as a solvent. The solvent does the dissolving.- Types of solutions :...

 that completely, or almost completely, ionizes or dissociates in a solution. These ions are good conductors of electric current in the solution.

Originally, a "strong electrolyte" was defined as a chemical that, when in aqueous solution, is a good conductor of electricity. With greater understanding of the properties of ion

Ion

An ion is an atom or molecule in which the total number of electrons is not equal to the total number of protons, giving it a net positive or negative electrical charge. The name was given by physicist Michael Faraday for the substances that allow a current to pass between electrodes in a...

s in solution its definition was gradually changed to the present one.

A concentrated solution of this strong electrolyte has a lower vapour pressure than that of pure water at the same temperature. Strong acid

Strong acid

A strong acid is an acid that ionizes completely in an aqueous solution by losing one proton, according to the equationFor sulfuric acid which is diprotic, the "strong acid" designation refers only to dissociation of the first protonMore precisely, the acid must be stronger in aqueous solution than...

s, strong bases, and soluble ionic salts that are not weak acids or weak bases are strong electrolytes.

Writing reactions

For strong electrolytes, a single reaction arrow shows that the reaction occurs completely in one direction, in contrast to the dissociation of weak electrolytes, which both ionize and re-bond in significant quantities .

Strong electrolyte(aq) → Cation⁺(aq) + Anion^-(aq)

Strong electrolytes conduct electricity only when molten or in aqueous solutions.
Strong electrolytes break apart into ions completely.

The stronger an electrolyte the greater the voltage produced when used in a galvanic cell.

Examples of Strong Electrolytes

Strong Acid

• Perchloric acid
  Perchloric acid
  Perchloric acid is the inorganic compound with the formula HClO4. Usually encountered as an aqueous solution, this colourless compound is a strong acid comparable in strength to sulfuric and nitric acids. It is a powerful oxidizer, but its aqueous solutions up to appr. 70% are remarkably inert,...
  
   HClO₄
• Hydriodic acid HI
• Hydrobromic acid
  Hydrobromic acid
  Hydrobromic acid is a strong acid formed by dissolving the diatomic molecule hydrogen bromide in water. "Constant boiling" hydrobromic acid is an aqueous solution that distills at 124.3 °C and contains 47.6% HBr by weight, which is 8.89 mol/L. Hydrobromic acid has a pKa of −9, making it a...
  
   HBr
• Hydrochloric acid
  Hydrochloric acid
  Hydrochloric acid is a solution of hydrogen chloride in water, that is a highly corrosive, strong mineral acid with many industrial uses. It is found naturally in gastric acid....
  
   HCl
• Sulfuric acid
  Sulfuric acid
  Sulfuric acid is a strong mineral acid with the molecular formula . Its historical name is oil of vitriol. Pure sulfuric acid is a highly corrosive, colorless, viscous liquid. The salts of sulfuric acid are called sulfates...
  
   H₂SO₄
• Nitric acid
  Nitric acid
  Nitric acid , also known as aqua fortis and spirit of nitre, is a highly corrosive and toxic strong acid.Colorless when pure, older samples tend to acquire a yellow cast due to the accumulation of oxides of nitrogen. If the solution contains more than 86% nitric acid, it is referred to as fuming...
  
   HNO₃
• Chloric acid
  Chloric acid
  Chloric acid, HClO3, is an oxoacid of chlorine, and the formal precursor of chlorate salts. It is a strong acid and oxidizing agent....
  
   HClO₃
• Bromic acid
  Bromic acid
  Bromic acid, also known as hydrogen bromate, is an oxoacid that only exists in aqueous solution. It is a colorless solution that turns yellow at room temperature as it decomposes to bromine. Bromic acid and bromates are powerful oxidizing agents and are common ingredients in Belousov-Zhabotinsky...
  
   HBrO₃
• Perbromic acid
  Perbromic acid
  The compound perbromic acid is the inorganic compound with the formula HBrO4. It is an oxoacid of bromine. Perbromic acid is unstable and cannot be formed by displacement of chlorine from perchlorate, as periodates are prepared. It can only be made by protonation of the perbromate ion.Perbromic...
  
   HBrO₄
• Periodic acid
  Periodic acid
  Periodic acid, or iodic acid is an oxoacid of iodine having chemical formula HIO4 or H5IO6.In dilute aqueous solution, periodic acid exists as discrete hydronium and metaperiodate ions. When more concentrated, orthoperiodic acid, H5IO6, is formed; this dissociates into hydronium and...
  
   HIO₄
• Fluoroantimonic acid
  Fluoroantimonic acid
  Fluoroantimonic acid is a mixture of hydrogen fluoride and antimony pentafluoride in various ratios. The 1:1 combination forms the strongest known superacid, which has been demonstrated to protonate even hydrocarbons to afford carbocations and H2....
  
   HSbF₆
• Magic acid
  Magic acid
  Magic acid , is a superacid consisting of a mixture, most commonly in a 1:1 molar ratio, of fluorosulfonic acid and antimony pentafluoride...
  
   FSO₃HSbF₅
• Carborane superacid H(CHB₁₁Cl₁₁)
• Fluorosulfuric acid
  Fluorosulfuric acid
  Fluorosulfuric acid is the inorganic compound with the formula HSO3F. It is one of the strongest acids commercially available and is a superacid. The formula HFSO3 emphasizes its relationship to sulfuric acid, H2SO4; HSO3F is a tetrahedral molecule.-Chemical properties:Fluorosulfuric acid is a...
  
   FSO₃H
• Triflic acid CF₃SO₃H
• Citric Acid
  Citric acid
  Citric acid is a weak organic acid. It is a natural preservative/conservative and is also used to add an acidic, or sour, taste to foods and soft drinks...
  
  

Strong Base

• Potassium hydroxide
  Potassium hydroxide
  Potassium hydroxide is an inorganic compound with the formula KOH, commonly called caustic potash.Along with sodium hydroxide , this colorless solid is a prototypical strong base. It has many industrial and niche applications. Most applications exploit its reactivity toward acids and its corrosive...
  
   KOH
• Barium hydroxide
  Barium hydroxide
  Barium hydroxide is the chemical compound with the formula Ba2. Also known as baryta, it is one of the principal compounds of barium. The white granular monohydrate is the usual commercial form.-Preparation:...
  
   Ba(OH)₂
• Caesium hydroxide
  Caesium hydroxide
  Caesium hydroxide is a chemical compound consisting of an atom of caesium and a hydroxide group . It is a powerful base, much like other alkali metal hydroxides such as sodium hydroxide and potassium hydroxide...
  
   CsOH
• Sodium hydroxide NaOH
• Strontium hydroxide
  Strontium hydroxide
  Strontium hydroxide, Sr2, is a caustic alkali composed of one strontium ion and two hydroxide ions. It is synthesized by combining a strontium salt with a strong base...
  
   Sr(OH)₂
• Calcium hydroxide
  Calcium hydroxide
  Calcium hydroxide, traditionally called slaked lime, is an inorganic compound with the chemical formula Ca2. It is a colourless crystal or white powder and is obtained when calcium oxide is mixed, or "slaked" with water. It has many names including hydrated lime, builders lime, slack lime, cal, or...
  
   Ca(OH)₂
• Rubidium hydroxide
  Rubidium hydroxide
  Rubidium hydroxide is a strong basic chemical and alkali that is formed by one rubidium ion and one hydroxide ion.Rubidium hydroxide does not appear in nature. However it can be obtained by synthesis from rubidium oxide...
  
   RbOH
• Magnesium hydroxide
  Magnesium hydroxide
  Magnesium hydroxide is an inorganic compound with the chemical formula Mg2. As a suspension in water, it is often called milk of magnesia because of its milk-like appearance. The solid mineral form of magnesium hydroxide is known as brucite....
  
   Mg(OH)₂
• Lithium diisopropylamide
  Lithium diisopropylamide
  Lithium diisopropylamide is the chemical compound with the formula [2CH]2NLi. Generally abbreviated LDA, it is a strong base used in organic chemistry for the deprotonation of weakly acidic compounds. The reagent has been widely accepted because it is soluble in non-polar organic solvents and it...
  
   (LDA) C₆H₁₄LiN
• Lithium diethylamide (LDEA)
• Sodium amide
  Sodium amide
  Sodium amide, commonly called sodamide, is the chemical compound with the formula NaNH2. This solid, which is dangerously reactive toward water, is white when pure, but commercial samples are typically gray due to the presence of small quantities of metallic iron from the manufacturing process...
  
   NaNH₂
• Sodium hydride
  Sodium hydride
  Sodium hydride is the chemical compound with the empirical formula NaH. It is primarily used as a strong base in organic synthesis. NaH is representative of the saline hydrides, meaning it is a salt-like hydride, composed of Na+ and H− ions, in contrast to the more molecular hydrides such as...
  
   NaH
• Lithium bis(trimethylsilyl)amide
  Lithium bis(trimethylsilyl)amide
  Lithium bisamide is the organosilicon compound with the formula [3Si]2NLi. This colourless solid is a strong non-nucleophilic base used for deprotonation reactions and as a ligand...
  
  ((CH₃)₃Si)₂NLi