Which is the most strongest acid?

Answer 1

Corrected: pKa i.s.o. pH

1. Strongest Acid: hexa-Fluoro-Antimonic Acid (HSbF6 or HF.SbF5), pKa = -25

   Classified as a "Superacid". This acid will donate proton to C2H4 to form a ethane-carbocation. Compare: pKa(HClO4) = -10, HClO4 does not react with ethene.

2. Strongest Base: Lithium Diisopropylamide [(CH3)2CH]2NLi ; pKb of 22. Classified as a "Superbase"; based upon greater than the alkalinity of pure NaOH (Sodium hydroxide, but LiOH is even stronger)

Added: (s.o.a.)

pH is a measure (or result) of the 'strength' (Ka) AND concentration [molarity] of an acid. But there is a limit to concentration of acid in water (solubility) AND the concentration of free (acidic) protons in water. That's why pH will never be much lower than -1.0 (proton concentration greater than 10.0 M rather impossible).

Addendum: Although LDA is certainly a strong base, I wouldn't call it the strongest. Sodium amide, for example, has a pKa of 38, compared to 36 for LDA. Grignard reagents have even higher pKas, somewhere around 45, and there are likely stronger bases beyond that. Bear in mind, though, that these only apply to non-aqueous solutions; in water, the strongest acid which will exist is hydronium (H3O+), and the strongest base is hydroxide (HO-).

Answer 2

Fluoroantimonic acid is the the strongest known acid. It is about 2 x 1019 or 20000000000000000000times stronger than 100% sulfuric acid.

Answer 3

Currently the strongest super acid system, is a mixture of three different chemicals:

# Fluorosulfuric acid (FSO3H) # Antimony pentafluoride (SbF5) # Sulfur trioxide (SO3) The mixture produces the strongest superacid system in the world, it is also highly corrosive. It beats even the previous record, Fluoroantimonic acid, an 80% mixture of Antimony pentafluoride (SbF5) and 20% Hydrofluoric acid (HF).

Since there is no commonly accepted definition for what qualifies as a superbase, a single most powerful base is disputed, however there are three main classes of superbases: organic, organometallic, and inorganic.

* For organic superbases, the combination of tert-butyllithium and potassium tert-butoxide, are commonly used * For organometallic superbases, the Grignard reagents, unstabilized alkoxides or lithium diisopropylamide are often cited * For inorganic superbases, salts with highly charged, small negative ions, e.g. lithium nitride, or alkali and earth alkali metal hydrides (sodium hydride, calcium hydride) are superbases

Answer 4

Basic compouds are compounds that when dissolved in water, gives a solution with hydrogen ion activity greater then in pure water a pH more than 7.0, such as ammonia and sodium hydroxide. Acidic compounds are compounds that when dissolved in water, gives a solution with hydrogen ion activity greater then in pure water a pH less than 7.0, such as vinegar(acedic acid).

Answer 5

Carborane acid is the strongest acid in the world, it is 20 quintillion times stronger than 100% sulfuric acid but confusingly it is not corrosive. If you are looking for the most corrosive acid then you are looking for Florosulfuric acid. This acid is so corrosive it can burn through glass, the only way to store it is to freeze it and it can only be held by Teflon lined containers for an hour at room temperature. It is made by mixing sulfure oxide (so3) and hydro florine (hf) to make the chemical formula of Florosulfuric acid (fhso3).

Answer 6

Most of the standardized tests students take, like the SAT and GRE, are based on your ability to reason or to understand a concept. The emphasis isn't on memorization. However, in chemistry there are some things you just have to commit to memory. You'll remember the symbols for the first few elements and their atomic masses and certain constants just from using them. On the other hand, it's harder to remember the names and structures of the amino acids and the strong acids. The good news, regarding the strong acids, is any other acid is a weak acid. The 'strong acids' dissociate completely in water.

Strong Acids You Should Know

• HCl - hydrochloric acid
• HNO3 - nitric acid
• H2SO4 - sulfuric acid
• HBr - hydrobromic acid
• HI - hydroiodic acid
• HClO4 - perchloric acid

The World's Strongest Acid

Although this is the strong acid list, probably found in every chemistry text, none of these acids hold the title of World's Strongest Acid. The record-holder used to be fluorosulfuric acid (HFSO3). However, the strongest acid is currently Fluoroantimonic acid, which has a pKa of -25 and is 2×1019 times stronger than sulphuric acid.

Strong Is Different from Corrosive

The carborane acids are incredible proton donors, yet they are not highly corrosive. Corrosiveness is related to the negatively-charged part of the acid. Hydrofluoric acid (HF), for example, is so corrosve it dissolves glass. The fluoride ion attacks the silicon atom in silica glass while the proton is interacting with oxygen. Even though it is highly corrosive, hydrofluoric acid is not considered to be a strong acid because it does not completely dissociate in water.

Answer 7

Fluoroantimonic acid = HSbF6