--- title: "Sodium Hydride | Inorganic Chemistry I" description: "Sodium hydride (NaH) is a strong base and hydride reagent in Inorganic Chemistry I, used to deprotonate acids and generate H2 in alkali metal chemistry." canonical: "https://fiveable.me/inorganic-chemistry-i/key-terms/sodium-hydride" type: "key-term" subject: "Inorganic Chemistry I" unit: "Unit 4" --- # Sodium Hydride | Inorganic Chemistry I ## Definition Sodium hydride (NaH) is an ionic hydride of sodium used in Inorganic Chemistry I as a strong base and hydride source. It reacts with acidic protons to form hydrogen gas and sodium salts. ## What It Is Sodium hydride, NaH, is an ionic compound made from Na+ and hydride, H-, and in Inorganic Chemistry I you usually meet it as a very strong base. It is not a neutral “hydrogen-containing” salt in the casual sense. The hydrogen in NaH behaves like hydride, meaning it is electron-rich and ready to grab a proton from a more acidic compound. That proton-transfer behavior is the main thing to know. When NaH meets something with an acidic hydrogen, such as an alcohol or another protic compound, it removes that proton and forms H2 gas. The driving force is the formation of stable products, especially gaseous hydrogen, which leaves the reaction mixture. In a reaction scheme, you can think of NaH as a deprotonating reagent that turns an X-H bond into X-Na (or more accurately, a sodium salt of the conjugate base). NaH is usually made by direct reaction of sodium metal with hydrogen gas. That fits the broader alkali metal chemistry theme in this course: Group 1 metals lose electrons easily, and their compounds often show strong ionic character. Sodium hydride is one of the cleaner examples of that trend because it combines an alkali metal cation with a hydride anion rather than a halide, oxide, or hydroxide. A useful detail is that NaH is a solid reagent, but it is not something you treat casually in air or water. It reacts vigorously with moisture, producing sodium hydroxide and hydrogen gas. That means the chemistry is happening fast enough to matter in both lab safety and reaction planning. If a question asks why NaH must be kept dry or under inert atmosphere, the short answer is that water would consume the reagent before it can do the deprotonation you want. In practice, NaH often appears when a synthesis needs a strong base that is not also a good nucleophile. That makes it especially useful for forming alkoxides, enolates, or other conjugate bases before a later step. In an inorganic chemistry unit, you are less likely to focus on detailed organic product sets and more likely to focus on why the reagent behaves the way it does: ionic structure, hydride reactivity, and the consequences of alkali metal chemistry. ## Why It Matters Sodium hydride shows up in Inorganic Chemistry I because it ties together several core ideas from the unit on alkali and alkaline earth metals. You can see the effect of Group 1 reactivity, ionic bonding, acid-base behavior, and redox thinking all in one reagent. If you know why NaH is so reactive, a lot of other metal hydride chemistry makes more sense. It also gives you a clean example of the difference between a strong base and a nucleophile. NaH is used to remove protons, not to attack carbon in the way many carbon-based reagents do. That distinction matters when you are predicting what a reagent will do in a problem set or lab write-up. NaH is also a good safety and mechanism checkpoint. If a question mentions water, moisture, or air exposure, you should immediately think hydrogen gas evolution and rapid consumption of reagent. That kind of reasoning shows up in lab questions, short-answer prompts, and reaction interpretation problems. More broadly, NaH helps connect the abstract idea of hydride ion to a real compound you can name, write, and classify. That makes it easier to compare it with other ionic compounds from the same topic, especially other metal hydrides and hydroxides. ## Connections ### Hydride Ion NaH is best understood through the hydride ion, H-. The reagent works because hydride is strongly basic and readily accepts a proton. If you do not recognize H- as a hydride, NaH can look like a simple salt instead of a reactive base with very different chemistry from molecular hydrogen. ### Alkali Metals Sodium hydride is a direct example of alkali metal chemistry. Sodium, a Group 1 metal, forms a +1 cation and makes ionic compounds with very reactive anions. NaH reflects the low ionization energy and strong ionic bonding trends that you study for alkali metals in this unit. ### Redox Reaction NaH is often discussed alongside redox, even when the main step looks like acid-base chemistry. Sodium metal and hydrogen gas are the starting materials used to make it, which involves electron transfer at some stage. In a problem, separating redox formation from proton-transfer use helps you track what is actually changing. ### [Cation Formation](/inorganic-chemistry-i/key-terms/cation-formation) The sodium part of NaH exists as Na+, which connects to cation formation in Group 1 chemistry. Sodium readily loses its valence electron, and that cation pairs with H- in the solid. This is a good example of how cation formation produces stable ionic compounds with nonmetals or hydride. ## On the AP Exam A quiz or problem set may ask you to predict what NaH does to a given substrate, identify the product gas, or explain why the reagent must be handled dry. When you see NaH, first ask whether the compound has an acidic proton that can be removed. If it does, the likely move is deprotonation with H2 formation, not oxidation or simple substitution. For short-response questions, use the vocabulary precisely: sodium hydride is an ionic hydride and a strong base. If the question gives moisture or water, point out that NaH is destroyed by hydrolysis and produces sodium hydroxide and hydrogen gas. In lab contexts, you may be asked to justify inert-atmosphere handling or explain an unexpected pressure buildup from H2 evolution. ## Sodium Hydride vs Hydride Ion The hydride ion is the anion H-, while sodium hydride is the actual compound NaH that contains hydride. They are related, but not the same thing. When you see a reaction, the ion is the reactive species inside the compound, and the compound is the reagent you handle in the lab or see in a problem. ## Key Takeaways - Sodium hydride is an ionic compound, NaH, made of Na+ and H-, and it behaves as a very strong base. - Its main chemistry in Inorganic Chemistry I is proton removal, which usually produces hydrogen gas as a product. - NaH is moisture-sensitive, so water or humid air can destroy it before it does the reaction you want. - It fits the alkali metal unit because sodium forms a +1 cation and pairs with a highly reactive anion. - When you see NaH in a problem, think deprotonation first, not ordinary salt behavior. ## FAQs ### What is sodium hydride in Inorganic Chemistry I? Sodium hydride is NaH, an ionic hydride made from sodium and hydrogen. In this course, it is usually taught as a strong base and hydride reagent that removes acidic protons and releases H2 gas. ### Why is sodium hydride such a strong base? Because it contains hydride, H-, which is very eager to pick up a proton. That makes NaH effective at deprotonating compounds with acidic hydrogens, especially in dry reaction conditions. ### What happens when sodium hydride reacts with water? It reacts vigorously and breaks down, producing sodium hydroxide and hydrogen gas. That is why NaH has to be stored and used under dry or inert conditions. ### Is sodium hydride a reducing agent or a base? In many Inorganic Chemistry I problems, you should think of it first as a strong base. It can be discussed in redox-related contexts because it contains hydride, but its common lab use is proton removal rather than broad reduction chemistry. ## Related Study Guides - [4.2 Reactions and Compounds of Alkali and Alkaline Earth Metals](/inorganic-chemistry-i/unit-4/reactions-compounds-alkali-alkaline-earth-metals/study-guide/yZ4g3ekrRZifzXEj) ## About This Document Canonical Fiveable pages are available as Markdown at the same path plus `.md`. - [llms.txt](https://fiveable.me/llms.txt): index of Fiveable's sections and URL patterns - [llms-full.txt](https://fiveable.me/llms-full.txt): complete subject and unit listing - [MCP server](https://fiveable.me/mcp): call Fiveable as tools instead of fetching pages (`https://fiveable.me/api/mcp`) - [MCP server for AP teachers](https://fiveable.me/mcp/teachers): a teacher's classes, assignments and AP-rubric grading (`https://fiveable.me/api/mcp/teacher`) ## Structured Data ```json {"@context":"https://schema.org","@graph":[{"@type":"LearningResource","@id":"https://fiveable.me/inorganic-chemistry-i/key-terms/sodium-hydride#resource","name":"Sodium Hydride | Inorganic Chemistry I","url":"https://fiveable.me/inorganic-chemistry-i/key-terms/sodium-hydride","learningResourceType":"Concept explainer","educationalLevel":"AP® / High School","about":{"@id":"https://fiveable.me/inorganic-chemistry-i/key-terms/sodium-hydride#term"},"audience":{"@type":"EducationalAudience","educationalRole":"student"},"dateModified":"2026-07-03T02:22:02.388Z","isPartOf":{"@type":"Collection","name":"Inorganic Chemistry I Key Terms","url":"https://fiveable.me/inorganic-chemistry-i/key-terms"},"author":{"@type":"Organization","@id":"https://fiveable.me/editorial#content-team","name":"Fiveable Content Team","url":"https://fiveable.me/editorial","parentOrganization":{"@id":"https://fiveable.me/#organization"},"member":[{"@type":"Person","name":"Amanda DoAmaral","sameAs":["https://www.linkedin.com/in/adoamaral"]},{"@type":"Person","name":"Becky Bahr","sameAs":["https://www.linkedin.com/in/becky-bahr-b52743132"]}]},"publisher":{"@type":"Organization","name":"Fiveable","url":"https://fiveable.me"}},{"@type":"DefinedTerm","@id":"https://fiveable.me/inorganic-chemistry-i/key-terms/sodium-hydride#term","name":"Sodium Hydride","description":"Sodium hydride (NaH) is an ionic hydride of sodium used in Inorganic Chemistry I as a strong base and hydride source. 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