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Heating Mantle With Variac Control -

A heating mantle can easily generate enough heat to vaporize most organic materials and will melt a flask if used on full power. Always plug the heating mantle into a grounded variable voltage transformer or percentage timer control (which runs at full power but cycles on and off to control the heat). Such devices are often known by the trademarked name, Variac (below, …

Can you please help me for synthesis of 4-aminobenzoic ...

apparatus with clamps, and heat the mixture at a gentle reflux for 60-75 minutes using a heating mantle and Variac power controller. The solid should dissolve as …

Preparation and Characterization of Methyl ... - Graduateway

Apr 05, 2017 Reflux apparatus was assembled using a 10 mL round flask and water cooled condenser. Heating mantle and a Variac was used as a heat source. The flask was heated gently at 70 oC for two hrs until the reflux mixture turned cloudy with a layer on the top of it. Subsequently the reflux mixture was cooled to the room temperature.

1.4G: Heating Mantles - Chemistry LibreTexts

Aug 03, 2021 Figure 1.51: a) Three sizes of heating mantle, b) Heating mantle connected to a Variac, c) Filling a heating mantle with sand. Heating mantles take some time to warm up (so may be pre-heated during setup of an apparatus), and also take some time to cool down. The mantle will remain warm even after turning off the Variac, and therefore flasks ...

Heating mantel variac questions - Distillation - Future4200

Aug 26, 2020 I am having issues with my heating mantel jumping way past sp temps. By like 10 to 20c i have read that you can achieve better temp control using a variac and a kill a volt. What i am unsure of is exactly how to connect these parts to …

Chem 211 - Techniques - Wellesley College

Because the entire apparatus is raised above the level of the table, the heating mantle can be lowered, as shown on the right, to cool the flask quickly. It is very important to include boiling stones in the flask and to plug the heating mantle into a Variac.

Sciencemadness Discussion Board - Heating mantle question ...

Dec 05, 2006 posted on 29-6-2006 at 10:29. Heating mantle question. Alright, so let's say one plugs in a heating mantle, with the variac, and seconds later it begins smoking, the netting turns an awful brown color (which leaves a residue on the flask), and so you unplug it. You look under the netting and there are rings of burn marks on the cotton underneath.

Heat Sources and Heating Baths - Stony Brook University

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

Feb 12, 2017 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.

Philmore Model 48-1205 Variac 500va Variable AC ... - eBay

Find many great new used options and get the best deals for Philmore Model 48-1205 Variac 500va Variable AC Regulating Transformer at the best online prices at eBay! Free shipping for many products! ... - Best Selling in Heating Mantles. 5000ml 120v Electric Heating Mantle 1000w 5l Temp Control Sleeves American Plug. No ratings or reviews yet ...

PowerPoint Presentation

H2SO4 + H2O 120 V H2O in H2O out Variac condenser heating mantle set Variac to ≈ 75% of line voltage clamp ring clamp The reaction is heated to reflux After 1 hour the reaction is cooled and water is added; the layers are separated and the organic layer is washed with NaHCO3 and separated. The organic layer is dried over anhydrous MgSO4 or ...

The Recrystallization of Benzoic Acid

Heating mantle and variac. Addition of boiling water to impure crystals. 4) Add a small amount of charcoal to the solution (page 113, OCLSM) and gravity filter (pages 106-109, OCLSM) using a funnel fitted with fluted filter paper (pages 117-118, OCLSM). Collect the filtrate in a 250 mL Erlenmeyer flask.

Recipes for Cooling Baths - University of Rochester

Heating mantle full of sand controlled by a Variac. Sand is less messy than oil and high temperatures are easy to attain. Put a thermometer in the sand and then experiment with the Variac until you achieve the correct temperature. Hot plate/water bath. Sometimes convenient for gentle heating (35-80 degrees). See Also: Complete list of heat ...

Heating Mantle - PCE Instruments

Heating Mantle. In case of heating mantle it goes about a device which is used in laboratories to heat special media in glass vessels. Due to the various sizes of the glass vessels the exact amounts of liquids can be heated. The scope of volumes of heating mantle at PCE ranges from 100 ml up to 10

Heating Mantles Selection Guide: Types Features ...

Heating mantles are available in either fabric or rigid constructions. Fabric mantles are flexible, and can be molded to accommodate a wide variety of flask shapes and sizes. ... Instead, a transformer, such as a variac, or some form of electronic relay or switch, should be used between the heating mantle and the wall socket. Configurations ...

Orgo II Lab Final Flashcards - Quizlet

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 the device. What is meant by the term bumping? Sudden and uncontrolled boiling of liquid.

Stereochemistry: Addition of Bromine to Trans-Cinnamic ...

Jan 10, 2022 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 ...

Stereochemistry: Addition of Bromine to Trans-Cinnamic ...

Jul 27, 2018 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 due ...

Fact Sheet: Heating Reactions PennEHRS

Jun 01, 2021 142-500. Sand. NA. 25-500+. Most oil baths are good for heating reactions 200 oC as they provide a more even distribution of heat and are easier to regulate. For reactions requiring higher temperatures, heating mantles and sand or salt baths must be used. Heating mantle apparatuses are controlled using a variable voltage regulator (Variac ...

Fact Sheet: Heating Reactions PennEHRS

Jun 01, 2021 Most oil baths are good for heating reactions 200 oC as they provide a more even distribution of heat and are easier to regulate. F or reactions requiring higher temperatures, heating mantles and sand or salt baths must be used. Heating mantle apparatuses are controlled using a variable voltage regulator (Variac), and therefore the reaction temperature …

Obscure Gear: What the heck is a Variac? - Creativeshory

Jun 15, 2020 Without variac transformers, heating mantles would cause hazardous effects. Thus, variac transformers provide the safety inside the lab. (5) Hot-wire cutting of Styrofoams. Regulated heat temperature is a requirement for cutting styrofoams. Hotwires are vulnerable for pressing too much heat, affecting the standard and shape of styrofoams.

Section 5.7 Title: Heating and Cooling Chemical Mixtures ...

low (~10 %) and turn it on. As the heating mantle equilibrates, slowly increase the setting on the Variac until the desired temperature is reached. • Never leave heating mantles unattended until you know that the desired temperature has been reached and is stable. It is very easy to accidentally overheat heating mantles. • When you are done ...

DC Variac Variac For Sale Gordo Sales

Model 36TBP controls provide a full-wave rectified, infinitely variable DC output voltage from a single-phase AC input. Phase-angle control via power semiconductors varies the AC input voltage, which in turn is full-wave rectified. The result is the infinitely variable DC output. Because power semiconductors replace contacts and brushes to ...

Synthesis of a Renewable Resource Block Copolymer

Plug the heating mantle into a variac (be sure not to plug it into a regular outlet) and set the variac to ca. 30-40 to begin heating. When the temperature reaches approximately 92-94 C (the melting point of L-lactide), dig a well in the sandbath using a metal scoopula large enough for

Heating Mantles VWR

SP Wilmad-LabGlass Reaction Kettle Heating Mantles, SP Industries. Supplier: SP Industries. Description: These all-glass constructed heating mantles are for use with LG-8071 through LG-8089 reaction kettles. They provide even heat distribution. ,14201-048EA,14201-112EA,14200-650EA,14200-916EA.

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. …

Exp 3 - Distillation - F17

The flask is situated into an appropriately sized heating mantle. The heating mantle should not be plugged directly into an outlet. The heating mantle should be plugged into a variable voltage controller (variac), which is then plugged into a wall outlet. Make sure the variac is turned down to zero initially. Do not plug the variac into an ...

Organic laboratory Heat Sources

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.

How to set up a reflux apparatus

The heating mantle should fit the flask size. The temperature will be difficult to control if the heating mantle lacks contact with the flask. The heating mantle will overheat or burn out if left unintended for too long. • Add the sand into the heating mantle. Make sure the sand occupies 2/3 of the heating mantle. Figure 1 Reflux Apparatus

Banana oil Lab Report - CHEM 2311 - Organic Lab - StuDocu

The solution was distilled using a simple distillation apparatus, and a heating mantle (variac 55-60). After the boiling point range has been obtained the flask was left to cool down, weighed and then an IR and NMR samples were submitted for identification. Reagents Table.

Columbia University in the City of New York

The variac is a device that modulates AC current. Wall current is 120 V; a variac can adjust that to anywhere between 0 and 120 V. Plugging the heating mantle into a variac allows you to control the temperature by controlling the voltage supplied to it. Test the mantle and variac by briefly turning the dial up to 100%.

The Benzophenone/Ketyl Tetrahydrofuran(THF) Still

Variac, heating mantle, and lab jack. Ver. 8/2009 CMP/WO and allow the mixture to stand overnight. Then quench the residual solvent with a small amount of absolute methanol under argon over several hours until the sodium metal is destroyed and allowed to stand overnight again. Add small amount absolute methanol again, and then check the ...

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 ...

Experiment 4: Purification of Liquids by Distillation

you will use to heat the flask. 4. Your heating mantle has a separate cord – be sure to securely plug and twist the cord on, then slide the heating mantle under the round bottom flask and adjust the iron ring so the flask is snuggly nestled inside the mantle. Plug the heating mantle into the Variac (which should be set to “off” and a ...

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