heating mantle with variac

Stereochemistry: Addition of Bromine to Trans-Cinnamic

2022-1-10 · Attach a heating mantle and variac and heat the mixture to a gentle reflux. The variac setting should initially be 25-30. Adjust this setting as necessary until the solution is refluxing . ? While it is refluxing, add the bromine solution at a rate of two drops per second. You need not loosen the stopper on the funnel for the bromine addition

Solved Why does a heating mantle always have to be

Without the variac, the heating mantle will not work. B. Without the variac, the temperature of the heating mantle does not reach above 100 oC. C. Without the variac, the heating mantle will heat uncontrollably and cause a fire hazard. D. The variac helps to maintain the temperature below 100 oC. E. The variac is used in case of a power surge

Hot Plate Use and Safety in Laboratory

2017-1-9 · Hot Plate Use and Safety in Laboratory . Hot plates are frequently used in the laboratory to perform chemical reactions, to heat samples, and for numerous other activities. Hot plates are conceptually simple a flat surface with heating elements– .

Organic laboratory Heat Sources - chem.ucalgary.ca

2013-8-30 · The heating element within the insulated mantle is wired to plug i nto a Variac controller which in turn is plugged into a 115 volt outlet. Never plug the mantle directly into a 115 volt outlet; you might burn out the heating element. In operat ing a heating mantle, the controller should initially be off and reading zero voltage.

Heat Sources and Heating Baths - Stony Brook University

2018-2-20 · electrocution. Always disconnect a Variac from the outlet before working with the device plugged into it. Discard the heating mantle if the fiberglass is brittle or cracked. Do not use any electrical equipment if any wires are frayed or exposed. Know where the nearest Fire Alarm Pull Box is to your lab. Know how to use a fire extinguisher.

An Inexpensive Controller for Heating Mantles - NASA/ADS

The conventional way to control the power to a heating mantle is through the use of a Variac. In a typical undergraduate teaching laboratory there are some 20 heating mantles in use at any given time, requiring some 20 Variacs, at a cost of approximately 180 each (for an inexpensive one). The price of an inexpensive Variac is usually greater than that of an expensive mantle.

Oil Baths in Laboratories | Environmental Health …

2022-4-15 · Can be used with a glass wool support in a heating mantle or metal container with a Variac that provides uniform heat distribution. Spatter danger much lower. Warning: DO NOT let the distillation flask become dry while using …

An Inexpensive Controller for Heating Mantles - NASA/ADS

The conventional way to control the power to a heating mantle is through the use of a Variac. In a typical undergraduate teaching laboratory there are some 20 heating mantles in use at any given time, requiring some 20 Variacs, at a cost of approximately 180 each (for an inexpensive one). The price of an inexpensive Variac is usually greater than that of an expensive mantle.

Molecular Sieve Drying - University of …

2013-5-10 · Heating Mantle with cover Heating Mantle showing aluminum cup with silica gel A "Variac", or Variable AC autotransformer to control input power to the heating mantle. The heating mantle shown above required a setting of …

Sciencemadness Discussion Board - Heating mantle/variac

2015-11-5 · Heating mantle/variac Hello all, first post after months of lurking. I bought glassware,a variable temp heating mantle with stirrer and a variac. Total novice at chemistry and am only looking to distill ethanol and use it for soxhlet extractions. So I set up the glass to distill the ethanol from a bottle of Everclear, plugged the mantle into

Heating Mantles Selection Guide: Types, Features

2022-4-9 · Heating mantles are used to heat flasks containing a sample. Heating mantles are used in place of Bunsen burners or hot plates when the sample is an organic liquid. Organic liquids have a tendency to burst into flames when exposed to direct heat, or release flammable organic vapors are heavier than air, which can explode when contacting open flames or …

An Inexpensive Controller for Heating Mantles - NASA/ADS

The conventional way to control the power to a heating mantle is through the use of a Variac. In a typical undergraduate teaching laboratory there are some 20 heating mantles in use at any given time, requiring some 20 Variacs, at a cost of approximately 180 each (for an inexpensive one). The price of an inexpensive Variac is usually greater than that of an expensive mantle.

Heating Mantles Selection Guide: Types, Features

2022-4-9 · Heating mantles are used to heat flasks containing a sample. Heating mantles are used in place of Bunsen burners or hot plates when the sample is an organic liquid. Organic liquids have a tendency to burst into flames when exposed to direct heat, or release flammable organic vapors are heavier than air, which can explode when contacting open flames or …

Heating mantle with issues - Equipment - Science Forums

2017-2-12 · THIS is why you should be extremely careful when buying equipment on eBay, I finally thought maybe this is a 110-220 issue, so I popped off the variac housing and voila, sure enough the controller is rated 220-250v and it simply has a standard US plug attached.

Molecular Sieve Drying - University of …

2013-5-10 · Heating Mantle with cover Heating Mantle showing aluminum cup with silica gel A "Variac", or Variable AC autotransformer to control input power to the heating mantle. The heating mantle shown above required a setting of …

The Fractional Distillation of a Binary Mixture

2004-7-31 · 3. Heat the flask in a heating mantle with a variac setting between 50 and 60. 4. As the distillate begins to collect in the graduated cylinder begin to take data. You want to record the distillate temperature for each mL of distillate …

variac heating mantle - voltimum.nz

Variac heating mantle: CP Electronics: the perfect addition to Legrand’s portfolio. 29/10/2018. Industry News field. The company’s main driver is to help business’ reduce their carbon footprint through cost-effective lighting, heating and ventilation control systems. With a track record of providing prestigious products, CP Electronics

Heat Sources and Heating Baths - Stony Brook University

2018-2-20 · electrocution. Always disconnect a Variac from the outlet before working with the device plugged into it. Discard the heating mantle if the fiberglass is brittle or cracked. Do not use any electrical equipment if any wires are frayed or exposed. Know where the nearest Fire Alarm Pull Box is to your lab. Know how to use a fire extinguisher.

Heating mantle with issues - Equipment - Science Forums

2017-2-12 · THIS is why you should be extremely careful when buying equipment on eBay, I finally thought maybe this is a 110-220 issue, so I popped off the variac housing and voila, sure enough the controller is rated 220-250v and it simply has a standard US plug attached.

The Grignard Reaction - CHEM 238 - (CHEM 2125 - …

The THF was then distilled (and frequently removed from the collection well) using a heating mantle with the Variac set to approximately 40% until most THF was gone and the reaction temperature had exceeded THF’s boiling point range. To distill the alcohol, the Variac setting was increased to 70 and any product that appeared in the collection

An Inexpensive Controller for Heating Mantles - NASA/ADS

The conventional way to control the power to a heating mantle is through the use of a Variac. In a typical undergraduate teaching laboratory there are some 20 heating mantles in use at any given time, requiring some 20 Variacs, at a cost of approximately 180 each (for an inexpensive one). The price of an inexpensive Variac is usually greater than that of an expensive mantle.

Heating Mantle with Magnetic Stirrer, …

Electric heating mantle with magnetic stirrer, various capacities of 100mL, 250mL, 500mL, 1L, 2L and 5L for your options, maximum heating teperature up to 380℃. The mantle is constructed with alkali-free glass fiber inner and has magnetci …

Solved QUESTION REVIEW Question 2 Status: Not yet - …

In order to heat a round bottom flask in a heating mantle, plug the heating mantle into a Variac ( or Powermite ) . Turn the heat up gradually and do not exceed 50-60 % of the maximum output of th… View the full answer

Heating mantle with issues - Equipment - Science Forums

2017-2-12 · THIS is why you should be extremely careful when buying equipment on eBay, I finally thought maybe this is a 110-220 issue, so I popped off the variac housing and voila, sure enough the controller is rated 220-250v and it simply has a standard US plug attached.

Organic Synthesis pre lab - CHM 6095 - Chemical Research

Reflux the mixture for 1 hour using a heating mantle with Variac heat source; Allow the solution to cool; Obtain a separatory funnel and add 50 mL of water; Decant the solution in the separatory funnel and rinse the flask with 35 mL of t-butyl methyl ether; Add the ether into the separatory funnel; Shake funnel and release pressure multiple times

Solved Why does a heating mantle always have to be

Without the variac, the heating mantle will not work. B. Without the variac, the temperature of the heating mantle does not reach above 100 oC. C. Without the variac, the heating mantle will heat uncontrollably and cause a fire hazard. D. The variac helps to maintain the temperature below 100 oC. E. The variac is used in case of a power surge

Heating Mantle with Magnetic Stirrer, …

Electric heating mantle with magnetic stirrer, various capacities of 100mL, 250mL, 500mL, 1L, 2L and 5L for your options, maximum heating teperature up to 380℃. The mantle is constructed with alkali-free glass fiber inner and has magnetci …

Section 5.7 Title: Heating and Cooling Chemical Mixtures

2021-3-24 · Never plug a heating mantle directly into a standard outlet, as it will overheat. When using a heating mantle: • Select a heating mantle that is the appropriate size for your flask. If the flask does not fit perfectly, use a larger heating mantle filled with sand has a heat transfer agent. Sand is available near the large oven in 6319.