{"id":1934,"date":"2025-03-28T18:39:08","date_gmt":"2025-03-28T13:09:08","guid":{"rendered":"https:\/\/www.labkafe.com\/blog\/?p=1934"},"modified":"2025-06-26T13:58:55","modified_gmt":"2025-06-26T08:28:55","slug":"laboratory-hood","status":"publish","type":"post","link":"https:\/\/www.labkafe.com\/blog\/laboratory-hood\/","title":{"rendered":"10 Dangerous Experiments That Demand a Laboratory Hood"},"content":{"rendered":"\n\n\n

Have you ever felt the strange smell of ammonia vapors or the stinging sensation of HCl fumes? Bad news. Not only is the smell disgusting, but the vapors can also harm the lining of your nose and damage your lungs and respiratory system. Seeing this problem, chemists developed the laboratory hood, or fume hood,<\/strong> in the early 20th century. Since then, it has been the gold standard in laboratories that work with chemical substances releasing toxic fumes, vapors, or particles that can harm the user.<\/p>\n\n\n\n

Who needs the laboratory hood?<\/h2>\n\n\n\n
\"Laboratory
Laboratory hoods are needed where toxic vapors, flammable gases or disturbing odors are released as a result of chemical experimentation<\/figcaption><\/figure>\n\n\n\n

Schools, colleges, research institutes, and industries that work with chemicals that are volatile, have low boiling points, and produce toxic vapors and fumes need to install laboratory or fume hoods. These filter and purify the air, emitting it outside or recirculating it into the lab. They absorb air from inside and around the fume hood when switched on. Even when the laboratory hood sash is closed, it can still pull in and purify air.<\/p>\n\n\n\n

Which dangerous experiments need to be performed inside a laboratory hood?<\/h2>\n\n\n\n

Schools, colleges, research institutes and industries have separate categories of experiments that need a laboratory hood. <\/p>\n\n\n\n

\"A
A standard laboratory hood<\/figcaption><\/figure>\n\n\n\n

Laboratory Hoods for Dangerous Experiments in School Labs<\/h3>\n\n\n\n

Schools normally follow a syllabi such that lab experiments are relatively safe. However, some experiments need to be performed inside a fume hood, especially since young children and relatively untrained students are involved. <\/p>\n\n\n\n

Neutralization reactions in laboratory hood<\/h3>\n\n\n\n
\"this
HCl and NaOH react to produce water and sodium chloride.<\/figcaption><\/figure>\n\n\n\n

HCl (aq) + NaOH (aq) \u2192 NaCl (aq) + H\u2082O (l)\u200b<\/p>\n\n\n\n

Dangers:<\/strong> HCl (aq) often emits acidic fumes that are harsh on the respiratory epithelium of the nose and lungs. Hence, laboratory hoods can be used to minimize the amount of HCl vapour inhaled by students during chemistry practicals.<\/p>\n\n\n\n

Displacement reactions in laboratory hood<\/h3>\n\n\n\n

Zn (s) + 2HCl (aq) \u2192 ZnCl\u2082 (aq) + H\u2082 (g)\u200b<\/p>\n\n\n\n

Dangers:<\/strong> The issue of HCl vapors persists here. The H\u2082 gas that is emitted is flammable and cannot be allowed to accumulate inside the chemistry lab. <\/p>\n\n\n\n

Combustion reactions in laboratory hood<\/h3>\n\n\n\n
\"Flammable
Flammable methane reacts with oxygen to form carbon dioxide and water<\/figcaption><\/figure>\n\n\n\n

CH\u2084 (g) + 2O\u2082 (g) \u2192 CO\u2082 (g) + 2H\u2082O (g)\u200b<\/p>\n\n\n\n

Dangers: <\/strong>Methane is highly flammable. This reaction should be conducted with complete precautions, such as a controlled supply of methane before combustion, proper dispersal, and ventilation in case of leakage. Regular checks are necessary to ensure that accidental leaks do not occur when no one is watching.<\/p>\n\n\n\n

Additionally, the CO\u2082 formed is toxic if it accumulates inside the lab. It displaces oxygen and makes breathing difficult. When multiple students perform the experiment, a large amount of CO\u2082 will accumulate inside the lab, causing suffocation. Hence, it must be performed inside a laboratory hood.<\/p>\n\n\n\n

Laboratory Hoods for Dangerous Research Experiments<\/h3>\n\n\n\n

Research institutes deal with reactions that are generally not demonstrated at the school level. Some of these reactions can be dangerous, others emit toxic or flammable fumes necessitating fume hoods. <\/p>\n\n\n\n

Oxidation of Organic Compounds\u200b in Laboratory Hood<\/h3>\n\n\n\n
\"Oxidation
Oxidation of toluene with potassium permanganate forms benzoic acid<\/figcaption><\/figure>\n\n\n\n

C\u2086H\u2085CH\u2083 (toluene) + KMnO\u2084(HCl) \u2192 C\u2086H\u2085COOH (benzoic acid)\u200b<\/p>\n\n\n\n

Dangers: <\/strong>Toluene is highly flammable, irritant to the skin and mildly toxic when inhaled. Hydrochloric Acid is corrosive and releases HCl gas that is also corrosive. Hence, laboratory hoods can benefit scholars working in these settings. <\/p>\n\n\n\n

Grignard Reactions\u200b in Laboratory Hood<\/h3>\n\n\n\n
\"The
The Grignard reaction takes place in two steps: nucleophilic attack and hydrolysis<\/figcaption><\/figure>\n\n\n\n

RMgX + R’COR” \u2192 R’R”RCOMgX
R’R”RCOMgX + H\u2082O \u2192 R’R”RCOH + Mg(OH)X<\/p>\n\n\n\n

Dangers: <\/strong>Grignard reagents are dissolved in highly flammable ethers. The alkanes released are sometimes flammable. Hence the fume hood serves to remove alkane vapors from the lab. This reduces the chance of fire hazards. <\/p>\n\n\n\n

Diazotization Reactions\u200b in Laboratory Hood<\/h3>\n\n\n\n
\"Diazotization
Diazotization reaction of aniline forms benzene diazonium chloride<\/figcaption><\/figure>\n\n\n\n

ArNH\u2082 + NaNO\u2082 + HCl \u2192 ArN\u2082\u207aCl\u207b + 2H\u2082O\u200b<\/p>\n\n\n\n

Dangers: <\/strong>Certain conditions can produce nitrogen oxides (NO\u2093), which are harmful when inhaled, as well as hydrochloric acid (HCl) vapors. These can be dissipated and safely vented using a laboratory hood.<\/p>\n\n\n\n

Laboratory Hoods for Hazardous Industrial\/R&D Labs<\/h3>\n\n\n\n

Industrial labs usually test reactions in the R&D lab before scaling up to large-scale setups. This process is dangerous because, many times, you may not know the exact reaction dynamics and outcomes beforehand. Theoretically, you can perform some reactions more safely in fume hoods. <\/p>\n\n\n\n

Chlorination Reactions\u200b in Laboratory Hoods<\/h3>\n\n\n\n
\"Chlorination
Chlorination reaction of benzene forms chlorobenzene<\/figcaption><\/figure>\n\n\n\n

C\u2082H\u2084 + Cl\u2082 \u2192 C\u2082H\u2084Cl\u2082\u200b<\/p>\n\n\n\n

Dangers:<\/strong> You must handle Chlorine gas carefully. The vapour is extremely toxic and can cause respiratory damage. Laboratory hoods can remove the vapours from the air, if excess chlorine is dissipated inside the lab.\u00a0<\/p>\n\n\n\n

Nitration of Aromatic Compounds\u200b in Laboratory Hoods <\/h3>\n\n\n\n

C\u2086H\u2086 + HNO\u2083 \u2192 C\u2086H\u2085NO\u2082 + H\u2082O\u200b<\/p>\n\n\n\n

Dangers: <\/strong>Nitric and hydrochloric acids are used in this reaction. Both emit acidic pungent vapors that you must safely handle inside the laboratory hood.\u00a0<\/p>\n\n\n\n

Polymerization of Acrylates\u200b in Laboratory Hoods<\/h3>\n\n\n\n
\"Methyl
Methyl methacrylate polymerization using the free radical mechanism<\/figcaption><\/figure>\n\n\n\n

n CH\u2082=CHCOOCH\u2083 \u2192 [CH\u2082-CH(COOCH\u2083)]\u2099\u200b<\/p>\n\n\n\n

Dangers:<\/strong> Methyl methacrylate vapors are heavier than air. They can settle down and cause difficulty in breathing due to irritation in the respiratory system. They can also cause irritation in the eyes and on the skin. It is highly flammable when mixed with air, with a closed cup flash point of 2\u00b0C. <\/p>\n\n\n\n

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Book a Fume Hood or Laboratory <\/strong>Hood Today!<\/a><\/div>\n<\/div>\n\n\n\n

More Actions<\/h2>\n\n\n\n
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Get science lab equipment <\/a><\/div>\n\n\n\n
Learn how to maintain Fume Hoods<\/a><\/div>\n\n\n\n
Learn What are the Types of Fume Hoods<\/a><\/div>\n<\/div>\n\n\n\n

Frequently Asked Questions (FAQs)<\/h2>\n\n\n\n

Which chemical is dangerous in the laboratory?<\/h3>\n\n\n\n

A list of dangerous chemicals found in the lab according to MIT<\/strong><\/a> are:<\/p>\n\n\n\n