Maya Ellison
Acids are chemical substances that react with other substances by donating a proton (hydrogen ion). While some acids can dissolve plastic, others corrode metal, and others react with glass. Hydrochloric acid, for example, is a strong acid that is highly reactive with metals, metal oxides, and skin. However, it does not dissolve plastic. Hydrofluoric acid, on the other hand, is known to react with glass and some metals but is often stored in plastic containers. This is because plastic is extremely non-polar, and HF is extremely polar and/or ionic, meaning they have almost nothing in common, and like dissolves like.
| Characteristics | Values |
|---|---|
| Plastic's resistance to acid | Plastic is extremely non-polar, and resistant to hydrochloric acid |
| Hydrochloric acid's reactivity | Hydrochloric acid is highly reactive with metals, metal oxides, and skin |
| Hydrofluoric acid's reactivity | Hydrofluoric acid is highly reactive with glass and some metals |
| Plastic storage of acids | Plastics generally do not react with acids, and certain plastics are used for storing acids |
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What You'll Learn
Plastic is resistant to hydrochloric acid
Plastic is widely used to store liquids, especially chemicals like acids. This is because plastic is not only strong and lightweight but also highly resistant to acid chemical solutions. Several families of plastics have been developed with chemical compatibility in mind, making them ideal for storing corrosive liquids like concentrated acids.
One such example is polypropylene (PP), a semi-crystalline thermoplastic polymer that is widely used in the manufacture of containers, bottles, and storage items. PP is affordable, versatile, lightweight, and durable. It offers advantageous acid compatibility, which is why it is often used in the manufacture of chemical storage tanks. PP can easily withstand prolonged exposure to a wide variety of acidic chemicals, except for a few high-concentration acids.
Another example of an acid-resistant plastic is polytetrafluoroethylene (PTFE), better known under the trade name Teflon®. PTFE is a high-performance plastic prized for its impressive thermal resistance to both cold and heat, with an operating temperature range of -200 °C to 260 °C. Being chemically inert, PTFE can withstand even the most corrosive environments, resisting most types of acids.
Ethylene-chlorotrifluoroethylene (ECTFE) is another fluoropolymer that has been specially developed for corrosive environments. It has excellent resistance to both dilute and high-concentration acids and is mainly used in the chemical and pharmaceutical industries. ECTFE also has a wide operating temperature range of -76 °C to 148 °C.
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Hydrofluoric acid is very polar, plastic is non-polar
Hydrofluoric acid (HF) is a highly corrosive substance capable of dissolving many metals and attacking organic matter. It is also extremely toxic and can cause severe chemical burns. However, it is interesting to note that HF does not dissolve plastic, specifically a type of plastic called polyethylene. This is because HF is a highly polar substance, while plastic is extremely non-polar.
The principle that "like dissolves like" explains why HF does not react with plastic. Polar substances have a clear separation of positive and negative charges, allowing them to be attracted to substances with similar charge separations. Non-polar substances, on the other hand, have a more balanced distribution of charges. Due to their dissimilar charge characteristics, polar and non-polar substances do not typically interact or mix well.
Hydrofluoric acid's high polarity is due to its electron configuration. Fluorine ions (F-) have a high electron affinity, meaning they readily attract and steal bonds from other substances. This property enables HF to react with metals, glass, and ceramics. However, the non-polar nature of plastic means it lacks the charge separation that would allow HF to react with it.
Polyethylene, a type of plastic, is particularly resistant to HF due to its chemical structure. As a very long hydrocarbon with no unsaturation, polyethylene does not provide any reactive sites for fluorine to bind to. This is why it is commonly used as a safety measure in the storage and containment of HF, despite the fact that it falls into the broader category of organic compounds that HF can react with.
While HF does not dissolve plastic, it is still a highly dangerous substance. Its toxicity arises from its ability to bind with calcium ions in the body, disrupting the body's ability to regulate essential ions for muscle control and contraction. This can lead to severe health consequences, including death if left untreated. Therefore, despite its inability to dissolve plastic, HF requires careful handling and storage to ensure safety.
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Plastic is similar to flesh, which hydrofluoric acid does not dissolve
While plastic is similar to flesh in some ways, it differs in that it is typically hardier and less reactive. This is why hydrofluoric acid (HF) does not dissolve plastic. HF is a weak acid that is extremely polar and/or ionic, while plastic is extremely non-polar. The rule "like dissolves like" explains that similar substances are more likely to dissolve each other. Therefore, something similar to plastic would be needed to dissolve it, and HF is nothing like plastic.
Hydrofluoric acid has gained a reputation due to its portrayal in popular media, such as the TV show "Breaking Bad", where it is depicted as a quick and effective method for dissolving bodies. However, in reality, HF is not a strong acid, and its danger lies primarily in its toxicity rather than its ability to burn. When spilled on a glass surface, it can etch or dissolve the glass, but it will not harm human flesh in the same way.
The corrosive nature of HF is due to its ability to interfere with anything containing calcium, which is present in connective tissue and bone. This interference results in the slow destruction of these body components. While HF can be life-threatening, causing delayed damage by scavenging calcium from the body, it does not instantly dissolve flesh as often depicted in movies or television shows.
It is important to note that acids can pose a significant threat to human health and safety. Even weak acids like HF can be extremely dangerous due to their toxicity. Additionally, the effectiveness of acids in dissolving substances depends on various factors, including temperature, concentration, and the specific properties of the substance being targeted.
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Hydrofluoric acid is safe to store in plastic
Hydrofluoric acid is a highly corrosive substance capable of dissolving many materials, especially oxides. It is also highly reactive with glass and moderately reactive with many metals. This reactivity makes glass and metal containers unsuitable for storing hydrofluoric acid.
To ensure safety when handling strong acids, it is crucial to choose a container that will not react with the chemical. Plastic is often used to store corrosive chemicals. Certain types of plastic, such as polyethylene, fluorocarbon, polytetrafluoroethylene (PTFE), and lead, are resistant to hydrofluoric acid. These materials are commonly used to store hydrofluoric acid safely.
However, it is important to note that while these plastics are resistant, they may not be entirely impermeable. PTFE, for example, is slightly permeable to hydrofluoric acid. Therefore, it is essential to take additional precautions when storing this dangerous substance.
Hydrogen fluoride, the gaseous form of hydrofluoric acid, is an acute poison. Exposure to the gas or even dilute solutions of the acid can cause permanent damage to the lungs and eyes, deep tissue burns, and systemic toxicity leading to cardiac arrest. Therefore, it is crucial to store hydrofluoric acid in tightly closed containers made from the appropriate plastic materials and to follow safety guidelines to prevent spills or leaks.
In summary, hydrofluoric acid is typically stored in plastic containers made from specific types of plastic, such as polyethylene or Teflon, due to its reactivity with glass and metal. While these plastics offer resistance to the acid, they may not be entirely impermeable, so proper storage procedures must be followed to ensure safety.
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Some acids can dissolve plastic
While plastics generally do not react with acids, some acids can dissolve plastic. For instance, hydrochloric acid (HCl) can damage copper wires without harming the plastic insulation. However, burning the plastic insulation can make it harder to strip the wire. Dipping oxidized wires in hydrochloric acid or dilute sulfuric acid can remove copper(II) oxide or copper carbonate without dissolving the underlying copper metal.
Hydrofluoric acid (HF), despite its extreme toxicity and reactivity with glass and some metals, does not dissolve plastic. This is because plastic is extremely non-polar, while HF is highly polar and/or ionic, and substances generally only dissolve in similar compounds. HF is a weak acid that can be safely stored in plastic containers made of polyethylene, fluorocarbon, or lead.
On the other hand, strong acids like HCl will dissolve many organic compounds. HCl is a highly reactive strong acid and an important laboratory reagent. It is also the main component of gastric acid, which is produced naturally in the human stomach for digestion. However, it is crucial to handle HCl with care, as it can react with its storage container, causing acid burns if spilled, especially when highly concentrated.
Although plastics used for acid storage are especially unreactive, some plastics contain compounds that offer resistance to hydrochloric acid. Overall, the specific interactions between different types of acids and plastics vary, and certain combinations may lead to dissolution.
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Frequently asked questions
Plastics generally do not react with acids, and the plastics used for acid storage are especially unreactive. Plastic has resistance to hydrochloric acid.
Hydrofluoric acid is extremely polar and/or ionic, and plastic is extremely non-polar. The rule "like dissolves like" applies here, meaning that something similar to plastic would be needed to dissolve it.
Acids can be stored in plastic containers, but not all acids react the same way or with the same substances. Hydrofluoric acid, for example, should be stored in a tightly sealed container made of polyethylene, fluorocarbon, or lead.
