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Phosphoric acid or orthophosphoric acid, is a common inorganic acid, is a medium-strong acid.
Phosphoric acid or orthophosphoric acid, is a common inorganic acid, is a medium-strong acid.Phosphoric acid is mainly used in pharmaceutical, food, fertilizer and other industries, including as a rust resistance agent, food additives, dental and orthopedic surgery, EDIC preservatives, electrolytes, welding flux, dispersants, industrial preservatives, fertilizer as raw materials and component home cleaning products.Can be also used as a chemical reagent.
Phosphoric acid is safe to consume unless Phosphoric acid contact the eye and skin.
Inhalation: Not expected to be an inhalation hazard unless heated or misted. Can irritate the nose and throat.
Skin Contact: CORROSIVE. Contact can cause pain, redness, burns, and blistering. Permanent scarring can result. A severe exposure can cause death.
Eye Contact: CORROSIVE. Contact causes severe burns with redness, swelling, pain and blurred vision. Permanent damage including blindness can result.
Ingestion: Can burn the lips, tongue, throat and stomach. Symptoms may include nausea, vomiting, stomach cramps and diarrhea. Permanent damage can result.
Effects of Long-Term (Chronic) Exposure: At low concentrations: Can cause dry, red, cracked skin (dermatitis) following skin contact.
Phosphoric acid and its salts account for 25% of all the acid used in the food industries. The main use of phosphoric acid is in the soft drink industry, particularly cola and root beer beverages. Phosphoric acid functions as an acidulant and provides the specific tart note to the flavor of these products.
The concentration of phosphoric acid in coke is very low (around 0.055%). Compare this to the acid content of an orange, which is around 1%. It’s also worth emphasising that we don’t hold food or drink in our mouths for a long period of time, so this lessens the deleterious effects of any acids on tooth enamel.
The dominant use of phosphoric acid is for fertilizers, consuming approximately 90% of production.
Food-grade phosphoric acid (additive E338) is used to acidify foods and beverages such as various colas and jams, providing a tangy or sour taste. The phosphoric acid also serves as a preservative. Soft drinks containing phosphoric acid, which would include Coca-Cola, are sometimes called phosphate sodas or phosphates. Phosphoric acid in soft drinks has the potential to cause dental erosion.Phosphoric acid also has the potential to contribute to the formation of kidney stones, especially in those who have had kidney stones previously.
Specific applications of phosphoric acid include:
Phosphoric acid can be very hazardous in the case of skin contact, eye contact, and ingestion. It can also cause irritation if vapors are inhaled. This chemical can cause damage to the skin, eyes, mouth, and respiratory tract. Because of the potential hazards posed by this chemical, it is important to use care when handling it.
Repeated or prolonged exposure to phosphoric acid mist can lead to chronic eye irritation, severe skin irritation, or prolonged respiratory tract issues. To protect your health when handling this potentially hazardous chemical, it is important to use caution in the form of personal protective equipment (PPE).
Most species of known bacteria grow at an ideal pH of between 6.5 and 7.0 on the pH scale.Adding non-toxic acids to beverages and food products can lower the pH to 2.5, thereby reducing the chance of bacteria growing in sugar-rich drinks and food.
Phosphoric acid is a good additive in soft drinks and some processed foods because it's inexpensive and non-toxic. It also adds a tangy sour flavour, similar to that of citric acid in fruits.
Just like other acids, the pH of a phosphoric acid solution is directly proportional to the concentration of the solute. It also varies depending on other factors such as temperature and the types of ions that dissociate when the acidic substance is dissolved. For example, at 0.1 N aqueous solution, phosphoric acid has a pH of 1.5.
However, this only tells you the concentration of the hydronium ions at a logarithmic scale; it does not indicate the type of ions and their relative dissociations. It's important to note that phosphoric acid is a triprotic acid, meaning it has three acidic protons with corresponding pKa values.
Highly concentrated phosphoric acid can burn the skin and may cause serious injuries. It's therefore important to take all necessary precautions when handling this chemical at high concentrations. This means using goggles and gloves, as well as a laboratory apron or gown.
If your skin is exposed to highly concentrated phosphoric acid, immediately flush the affected area with lukewarm water for at least 30 minutes or until proper medical treatment is applied.
According to the Joint The Food and Agriculture Organization of the United Nations and the World Health Organization Expert Committee on Food Additives , "there is ample evidence to support the safety of the addition of small quantities of phosphoric acid to food. Thus, the use of 0.01-0.02%6 as a sequestrant, an antioxidant or "synergist" inantioxidant mixtures should present no health hazards whatsoever".
The Joint The Food and Agriculture Organization of the United Nations and the World
Health Organization Expert Committee on Food Additives , further added, "the use of
phosphoric acid to compensate for deficiency of fruit acidity, as a flavor component and in other ways, essentially within the "normal" concentration of phosphates naturally occurring in foods, should present no problem".
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