Alexei Volkov
Hydrofluoric acid (HF) is often portrayed in movies and television as a highly corrosive substance capable of instantly dissolving flesh and melting through solid objects. However, in reality, HF is relatively less potent, and its toxicity is mainly due to its ability to interfere with the body's regulation of ions like calcium. While HF can dissolve materials like glass and ceramic, it does not have the same effect on plastic. This is because plastic is extremely non-polar, while HF is highly polar and/or ionic, and substances generally only dissolve things that are similar to themselves. Additionally, plastics are generally unreactive to acids, and certain types of plastics used for acid storage are especially resistant. Hydrochloric acid (HCl), for example, is a strong acid that reacts with metals but does not dissolve plastic.
| Characteristics | Values |
|---|---|
| Plastic is extremely non-polar | HF (Hydrofluoric Acid) is extremely polar and/or ionic |
| Plastic has contents that resist hydrochloric acid | Hydrochloric acid is a strong acid |
| Plastic is similar to flesh | HF can dissolve glass and ceramic |
| HF is toxic |
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What You'll Learn
- Hydrofluoric acid doesn't dissolve plastic because it's extremely polar, and plastic is non-polar
- Hydrochloric acid is a strong acid, but plastic is resistant to it
- Hydrochloric acid is a weak reducing agent, not used to digest organic materials
- Plastic is used for storing acids, so it's unreactive
- Organic solvents, like acetone, are better for melting plastic
Hydrofluoric acid doesn't dissolve plastic because it's extremely polar, and plastic is non-polar
The dissolution of a substance follows the rule "like dissolves like". In other words, two similar substances are more likely to react with each other. Hydrofluoric acid (HF) is extremely polar and/or ionic, whereas plastic is extremely non-polar. The two substances have very little in common, and therefore HF does not dissolve plastic.
The F- ions in HF have a very high electron affinity due to their electron configuration of 7 electrons in the valence. This means that F- ions will steal bonds from other substances, which explains why HF reacts with glass and ceramics. However, HF will not strip away most organic molecules' functional groups. While it is a strong acid, it is not as strong as other acids such as HCl, which will dissolve many organic compounds.
The toxicity of HF is due to its ability to get into bones and disrupt the body's ability to regulate ions such as calcium. It is also corrosive and can cause severe chemical burns. However, it will not instantly dissolve or burn flesh as is often portrayed in movies and on television.
Although HF is toxic and corrosive, it is not a particularly strong acid compared to other hydrohalic acids. This is because fluorine has a good orbital overlap with hydrogen and is not very polarizable, so it resists donating its proton. This makes it less reactive with non-polar substances like plastic.
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Hydrochloric acid is a strong acid, but plastic is resistant to it
Hydrochloric acid is a strong acid with a multitude of uses, but certain plastics are resistant to it. This resistance is due to the chemical inertness of plastics, which prevents degradation when in contact with chemicals. Some plastics, such as polypropylene (PP), polytetrafluoroethylene (PTFE), and polyetheretherketone (PEEK), are highly resistant to acids. They can withstand prolonged exposure to a wide range of acidic chemicals without breaking down.
Polypropylene (PP) is a widely used semi-crystalline thermoplastic polymer known for its affordability, versatility, lightweight, and durability. It offers advantageous acid compatibility and can easily withstand exposure to various acidic chemicals, except for certain high-concentration acids.
Polytetrafluoroethylene (PTFE), commonly known as Teflon®, is a high-performance plastic prized for its impressive thermal resistance. It can withstand a wide range of temperatures, from -200 °C to 260 °C, and is chemically inert, making it resistant to even the most corrosive environments and most types of acids.
Polyetheretherketone (PEEK) is a semi-crystalline thermoplastic recognized for its physical and mechanical properties. It is hard, rigid, and resistant to traction, chemical products, and high temperatures up to 250 °C. While PEEK exhibits good resistance to weak and medium-strength acids, it is less resistant to highly concentrated acids at high temperatures compared to other plastics like PVDF.
The factors influencing a plastic's resistance to acids include acid concentration, acid type, temperature, and length of exposure. These acid-resistant plastics find applications in various industries, including aerospace, manufacturing, food, chemical, and pharmaceutical, where they are preferred for storing corrosive liquids and concentrated acids due to their lightweight, chemical compatibility, and mechanical resistance.
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Hydrochloric acid is a weak reducing agent, not used to digest organic materials
Hydrochloric acid is a strong inorganic acid with a pungent smell. It is a colourless solution and is also known as muriatic acid or spirits of salt. It is an important laboratory reagent and industrial chemical, used in many industrial processes such as refining metal. It is also a component of the gastric acid in the digestive systems of most animal species, including humans.
Hydrogen chloride, not hydrochloric acid, is used more widely in industrial organic chemistry. One of the most important applications of hydrochloric acid is in the pickling of steel, to remove rust or iron oxide scale. Technical quality HCl at typically 18% concentration is the most commonly used pickling agent for carbon steel grades.
Hydrochloric acid is a non-oxidizing acid that exhibits weak reducing properties during digestion. It is not an oxidizing agent, so it is not used to digest organic materials. However, it is an effective solvent for basic compounds such as amines and alkaloids in aqueous solutions, as well as for some organometallic compounds. It is also used to dissolve metal oxides such as iron and manganese oxides, and for the decomposition of inorganic matrices.
Hydrochloric acid is the least hazardous of the strong acids to handle and is quite stable upon storage. It is available as a pure reagent, making it an excellent acidifying reagent. It is the preferred acid in titration for determining the amount of base present.
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Plastic is used for storing acids, so it's unreactive
Acids are reactive substances that can interact with other materials by donating a proton (hydrogen ion). However, not all acids react the same way or with the same substances. Some acids can dissolve plastic, while others corrode metal or react with glass. For instance, nitric acid is highly corrosive and can destroy plastic containers.
Certain types of plastics are compatible with both acids and bases of different strengths. Polymethylpentene and polyethylene are plastics that can be used to store acids and bases. Polyethylene, in particular, is a very strong and durable material that is ideal for chemical storage as it is difficult to break, reducing the risk of spills. Additionally, Teflon, which is known for its slippery surface, is resistant to many chemicals, including strong acids such as sulfuric acid, sodium hydroxide, and nitric acid. Teflon-coated containers are therefore suitable for storing various acids.
The choice of container material depends on the specific acid or base being stored. For example, hydrofluoric acid, used in the production of refrigerants and herbicides, should be stored in plastic containers. Hydrofluoric acid is highly reactive to glass and some metals, making plastic a safer option. On the other hand, glass is commonly used for storing small quantities of certain acids, but its fragility makes it less suitable for larger-format storage or transportation.
It is important to note that containers for acids and bases should have tight-fitting caps to ensure safe long-term storage. Additionally, containers should be clearly labelled, and special care should be taken with acid or base mixtures that produce gas, as the gas buildup can destroy the container.
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Organic solvents, like acetone, are better for melting plastic
While acids do not react with plastics, organic solvents, such as acetone, can be used to melt certain types of plastics. Acetone is commonly sold in metal containers or mixed with water in nail polish remover and is known to have no impact on some materials while dissolving others. The chemical makeup of plastics varies, and some plastics have a chemical structure that is similar to acetone, causing them to soften or dissolve when in contact with the solvent.
The choice of plastic is crucial when considering its reaction to acetone. For instance, acetone severely affects acetal, softening or even dissolving it over time, especially at high concentrations. On the other hand, acetone is commonly sold in HDPE (high-density polyethylene) containers, indicating that HDPE is resistant to acetone. Similarly, LDPE (low-density polyethylene) is suitable for storing oxygenated solvents like acetone, although these solvents may slowly diffuse through the plastic over time.
Other plastics, such as polystyrene, should be avoided altogether as they lack structural integrity and can be easily damaged by even mild substances like lemon juice. When selecting a plastic for a specific application, it is essential to consult a plastic chemical resistance chart, which can provide valuable information about the compatibility of different plastics with solvents like acetone.
In summary, while acids do not react with plastics, organic solvents like acetone can effectively melt or dissolve certain types of plastics depending on their chemical composition. The choice of plastic becomes vital to ensure compatibility and prevent unwanted damage or dissolution.
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Frequently asked questions
Hydrochloric acid is a strong acid that is highly reactive with metals, metal oxides, and skin. Plastic contains some contents that are considered resistant to hydrochloric acid, and therefore, hydrochloric acid does not dissolve plastic.
Hydrofluoric acid (HF) is extremely polar and/or ionic, while plastic is extremely non-polar. Since they have almost nothing in common, HF does not dissolve plastic.
Plastics generally do not react with acids, and the plastics used for acid storage are especially unreactive.
An organic solvent can dissolve plastic.
Hydrochloric acid reacts with many metals to produce flammable hydrogen gas, which can become an explosion hazard.
