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A2950357

Sulfuricacid , 70% , 7664-93-9

Synonym(s):
aa;Sulfuric acid;Sulfuric acid solution

CAS NO.:7664-93-9

Empirical Formula: H2O4S

Molecular Weight: 98.08

MDL number: MFCD00282010

EINECS: 231-639-5

Update time: 2022-07-08

PRODUCT Properties

Melting point: 10°C
Boiling point: ~290 °C (lit.)
Density  1.840 g/mL at 25 °C (lit.)
vapor density  <0.3 (25 °C, vs air)
vapor pressure  1 mm Hg ( 146 °C)
Flash point: 11 °C
storage temp.  no restrictions.
solubility  H2O: soluble
pka -3-2(at 25℃)
form  Viscous Liquid
color  Pale yellow to slight tan
Specific Gravity 1.84
Odor Odorless
PH 2.75(1 mM solution);1.87(10 mM solution);1.01(100 mM solution);
Water Solubility  miscible
Sensitive  Hygroscopic
Merck  14,8974
Exposure limits TLV-TWA air 1 mg/m3 (ACGIH, MSHA, and OSHA); TLV-STEL 3 mg/m3 (ACGIH). .
Dielectric constant 84.0(20℃)
Stability: Stable, but reacts with moisture very exothermically, which may enhance its ability to act as an oxidizing agent. Substances to be avoided include water, most common metals, organic materials, strong reducing agents, combustible materials, bases, oxidising agents. Reacts violently with water - when diluting concentrated acid, carefully and slo
LogP -1 at 25℃

Description and Uses

Reactivity
Sulfuric acid is very reactive and dissolves most metals, it is a concentrated acid that oxidizes, dehydrates, or sulfonates most organic compounds, often causes charring. Sulfuric acid reacts violently with alcohol and water to release heat. It reacts with most metals, particularly when diluted with water, to form flammable hydrogen gas, which may create an explosion hazard. Sulfuric acid is not combustible, but it is a strong oxidizer that enhances the combustion of other substances, does not burn itself. During fire, poisonous gases are emitted. Hazardous decomposition products are as follows: sulfur dioxide, sulfur trioxide, and sulfuric acid fumes. Note: Use great caution in mixing with water due to heat release that causes explosions. Always add the acid to water, never the reverse.
Where Found
l Car battery acid
l Certain detergents
l Chemical munitions
l Some fertilizers
l Some toilet bowl cleaners
Derivation
Sulfuric acid is made from sulfur, pyrite (FeS2), hydrogen sulfide, or sulfur-containing smelter gases by the contact process (vanadium pentoxide catalyst). The first step is combustion of elemental sulfur, or roasting of iron pyrites, to yield sulfur dioxide. Then follows the critical reaction, catalytic oxidation of sulfur dioxide to sulfur trioxide.

Sulfuric Acid is an acidulant that is a clear, colorless, odorless liquid with great affinity for water. it is prepared by reacting sulfur dioxide with oxygen and mixing the resulting sulfur trioxide with water, or by reacting nitric oxide with sulfur dioxide in water. it is very cor- rosive. it is used as a modifier of food starch and is used in caramel production and in alcoholic beverages.

Safety

Symbol(GHS) 
GHS05
Signal word  Danger
Hazard statements  H290-H314
Precautionary statements  P234-P280-P301+P330+P331-P303+P361+P353-P304+P340+P310-P305+P351+P338
Hazard Codes  C,T,F,Xi
Risk Statements  36/38-35-39/23/24/25-23/24/25-11
Safety Statements  26-30-45-36/37-16
OEB C
OEL TWA: 1 mg/m3
RIDADR  UN 3264 8/PG 3
WGK Germany  1
RTECS  WS5600000
3
TSCA  Yes
HazardClass  8
PackingGroup  II
HS Code  28070010
Toxicity LD50 orally in rats: 2.14 g/kg (Smyth)
IDLA 15 mg/m3

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