Sulfuric acid is a notable exception, as passivation stops the reaction by forming the insoluble barium sulfate.

Sulfuric acid and H < sup >+</ sup > ions that have been formed can leak into the ground and surface water turning it acidic, causing environmental damage.

Sulfuric acid is a typical catalyst for this reaction.

Sulfuric acid then reacts with calcium carbonate causing an increased erosion within the limestone formation.

Sulfuric acid and SO < sub > 3 </ sub > combine to give oleum, a solution of pyrosulfuric acid ( H < sub > 2 </ sub > S < sub > 2 </ sub > O < sub > 7 </ sub >) in sulfuric acid.

Sulfuric and nitric acid dissolve thallium rapidly to make the sulfate and nitrate salts, while hydrochloric acid forms an insoluble thallium ( I ) chloride layer.

Not only is Sulfuric acid hygroscopic in high concentrated form but its solutions are hygroscopic down to concentrations of 10 Vol -% or below.

In some mines, Nickel and Cobalt are treated with CCD, after the original ore was treated with concentrated Sulfuric acid and steam in Titanium covered autoclaves, producing nickel cobalt slurry.

Sulfuric acid was initially produced by the Lead chamber process, but in 1890 a unit using the Contact process was brought on stream, producing the acid at higher concentration ( 98 % instead of 80 %) and at lower cost.

* Sulfuric acid ( H < sub > 2 </ sub > SO < sub > 4 </ sub >)

Sulfuric acid is usually prepared and shipped as the acid precursor oleum.

Sulfuric acid rain in the atmosphere of Venus evaporates before reaching the ground due to the high heat near the surface.

Sulfuric acid itself is regenerated by dilution of part of the oleum.

Car manuals recommend connecting the negative ( black ) cable last and disconnecting it first, since charging may produce hydrogen gas, which could explode if there is a spark ; if this ruptured the battery casing, it would then spray Sulfuric acid, possibly over the person performing the jump start ( see acid burn for consequences ).

# REDIRECT Sulfuric acid

# REDIRECT Sulfuric acid

# REDIRECT Sulfuric acid

< tr >< td > 1. 0 % Sulfuric acid ( ml ) </ td >< td > 9. 95 </ td >< td > 9. 9 </ td >< td > 9. 8 </ td >< td > 9. 7 </ td >< td > 9. 6 </ td ></ tr >

Sulfuric springs and steam vents, largely concentrated in the central and southern parts of the island, remain active, however.

For example, 10 % Oleum can also be expressed as H < sub > 2 </ sub > SO < sub > 4 </ sub >. 0. 1SO < sub > 3 </ sub >, 1. 0225SO < sub > 3 </ sub >. H < sub > 2 </ sub > O or 102. 25 % Sulfuric Acid.

Sulfuric acid soon became and remains the most common anodizing electrolyte.

Both theories easily describe the first reaction: CH < sub > 3 </ sub > COOH acts as an Arrhenius acid because it acts as a source of H < sub > 3 </ sub > O < sup >+</ sup > when dissolved in water, and it acts as a Brønsted acid by donating a proton to water.

A proton is transferred from an unspecified Brønsted acid to ammonia, a Brønsted base ; alternatively, ammonia acts as a Lewis base and transfers a lone pair of electrons to form a bond with a hydrogen ion.

The active ingredients are usually alcohol, chlorhexidine gluconate ,, cetylpyridinium chloride hexetidine, benzoic acid ( acts as a buffer ), methyl salicylate, benzalkonium chloride, methylparaben, hydrogen peroxide, domiphen bromide and sometimes fluoride, enzymes, and calcium.

In such situations, the kidneys release renin, which acts as an enzyme and cuts off all but the first 10 amino acid residues of angiotensinogen ( a protein made in the liver, and which circulates in the blood ).

DDT does not occur naturally, but is produced by the reaction of chloral () with chlorobenzene () in the presence of sulfuric acid, which acts as a catalyst.

Phospholipase A2 acts on the intact lecithin molecule and hydrolyses the fatty acid esterified to the second carbon atom.

New World vultures also urinate straight down their legs ; the uric acid kills bacteria accumulated from walking through carcasses, and also acts as evaporative cooling.

The enzyme pancreatic lipase acts at the ester bond, hydrolysing the bond and " releasing " the fatty acid.

The Brønsted – Lowry definition applies to other solvents, such as dimethyl sulfoxide: the solvent S acts as a base, accepting a proton and forming the conjugate acid SH < sup >+</ sup >.

In the roasting process, sulfuric acid is formed and acts on the clay to form aluminium sulfate, a similar condition of affairs being produced during weathering.

It is a reactant in the atmosphere, where it acts as an aerosol, decreasing air quality and clinging to water droplets, eventually resulting in nitric acid ( HNO < sub > 3 </ sub >) that produces acid rain.

The water acts like acid on the alien's skin, so Merrill starts smashing all of the half-empty glasses, before finally knocking the alien into a table, where water glasses spilled directly onto its face, killing it.

Trimethoprim acts by interfering with the action of bacterial dihydrofolate reductase, inhibiting synthesis of tetrahydrofolic acid.

* Nuclear localization signal, an amino acid sequence exposed on the surface of a protein which acts like a ' tag ' to localize the protein in the cell.

It works as a mechanical cleanser on the teeth and gums, neutralizes the production of acid in the mouth and also acts as an antiseptic to help prevent infections.

Fermentation of lactose by these bacteria produces lactic acid, which acts on milk protein to give yogurt its texture and its characteristic tang.

Acidity in the stomach is not buffered by food at this point and thus acts to inhibit parietal ( secretes acid ) and G cell ( secretes gastrin ) activity via D cell secretion of somatostatin.

Reaction takes place on treatment of alkenes with strong acid as catalyst.

Illustrative is the base-catalysed hydrolysis of esters, where the produced carboxylic acid immediately reacts with the base catalyst and thus the reaction equilibrium is shifted towards hydrolysis.

Another place where a heterogeneous catalyst is applied is in the contact process ( oxidation of sulfur dioxide on vanadium ( V ) oxide for the production of sulfuric acid ).

However, the biochemist Sidney Walter Fox and his co-workers discovered that phosphoric acid acted as a catalyst for this reaction.

Thorium dioxide has been used as a catalyst in the conversion of ammonia to nitric acid, in petroleum cracking and in producing sulfuric acid.

The most important industrial vanadium compound, vanadium pentoxide, is used as a catalyst for the production of sulfuric acid.

The hydration reaction of CO < sub > 2 </ sub > is generally very slow in the absence of a catalyst, but red blood cells contain carbonic anhydrase, which both increases the reaction rate and dissociates a hydrogen ion ( H < sup >+</ sup >) from the resulting carbonic acid, leaving bicarbonate ( HCO < sub > 3 </ sub >< sup >-</ sup >) dissolved in the blood plasma.

Such reactions are usually conducted in the presence of an acid catalyst or UV light.

Additionally, benzilic acid is made in a few steps starting from benzaldehyde and cyanide catalyst.

These reactions are often catalyzed by the addition of an acid or base catalyst.

Comes in two parts-a resin and an acid catalyst.

The acid catalyst is added right before application in a set ratio determined by the manufacturer.

In 2009, an acidified bentonite clay was proven to be a more economical catalyst than sulfuric acid as the acid medium.

In the presence of sulfuric acid catalyst, the oxime undergoes the Beckmann rearrangement to give the cyclic amide caprolactam:

One of the more complex hydration reactions utilises sulfuric acid as a catalyst.

Examples include the use of alkyl halides with a Lewis acid catalyst to alkylate aromatic substrates in Friedel-Crafts reactions.

In a standard oil refinery process, isobutane is alkylated with low-molecular-weight alkenes ( primarily a mixture of propene and butene ) in the presence of a strong acid catalyst, either sulfuric acid or hydrofluoric acid.