Florence flask

Flat-bottomed flask (the so-called Florence flask) with vial mouth. The sizes vary between 50 ml. and 40 litres. 

Rund-faser, /. round fiber, -feile, /. roimd file, -filter, m. round or circular filter, -flasche,/. round flask, Florence flask, -funk, m. (radio) broadcasting, rundhohl, a. concave. 

Place approximately 4 g NaOH in a 500-mL Florence flask. Add enough water to dissolve the pellets and bring the volume of the NaOH solution to about 400 mL. CAUTION The solution will get hot. Keep the stopper in the flask. 

B) Preparation of Sample. Place three of the bottles on a steam heated water bath, retaining one bottle as a reserve sample. Heat until all crysts are completely dissolved and then pour all three bottles into a heated, dry 500 ml Florence flask. Mix well and analyze as follows ... 

A mixture of 158 g. (5.6 moles) of acrolein (Note 1) and 450 ml. of absolute alcohol (Note 1) is placed in a 1-1. Florence flask. The neck of the flask is closed by a plug of cotton,1 and the flask is then immersed up to its neck in an ice bath containing about 1.5 kg. of ice. When the temperature of the mixture is about 0°, 50 ml. of absolute alcohol containing 2 g. of hydrogen chloride is added with swirling. The temperature is apt to rise very rapidly. The flask is clamped firmly in place and left 48-60 hours the ice is allowed to melt and is not renewed. 

Apparatus. The electrolytic cell consists of a 250-ml. widemouthed Erlenmeyer or Florence flask (pyrex) into... 

They did create some laboratory flasks, similar to the Erlenmeyer and Florence flasks that are still used today. 

A beaker (below left) is a cylindrical cup with a notch at the top. They are often used for making solutions. An Erlenmeyer flask (below center) is a conical flask. A liquid in an Erlenmeyer flask will evaporate more slowly than when it is in a beaker and it is easier to swirl about. A round-bottom flask (below-right) is also called a Florence flask. It is designed for uniform heating, but it requires a stand... 

A. Rubber tubing, Florence flask, Buchner funnel... 

A Florence flasks are round-bottomed and are used for uniform heating. They do not have the hose barb or the thick wall needed to serve as a filter flask during vacuum filtration. Only a designated filter flask should be used during vacuum filtration. Every other piece of equipment could be used in filtration. A spatula is often used to scrape dried product off of filter paper. 

For if you boil Water in a Florence-Flask, you see bubbles arising from the Bottom, these are Steam, as they mount they are condensed again by the cold supernatant Fluid, and their Sides clapping together make that Noise called Simmerring. I41 When Water boils in the /Eolipile or closed Tea-Ketde, what a Quantity of Steam ... 

Flasks. Various types of flasks find use in the organic laboratory. The student is already familiar with the boiling or Florence flask and the Erlenmeyer flask. The sizes of the former most useful for beginners are the 250 ml, 500 ml, and 1000 ml capacity of the Erlenmeyer flasks the 125 ml, 250 ml and 500 ml are the sizes most... 

B) Preparation of Nitrol nzene (M.). The same procedure is used as described in section (A). Use a 500-ml roxmd-bottom or Florence flask. Place in it 35 g (25 ml) of concentrated nitric acid, immerse the flask in a pail of cold water, and add in small portions 50 g (28 ml) of concentrated sulfuric acid, shaking between additions. Cool and add in small portions 25 g (30 ml) of benzene at such rate that the temperature does not rise above 50°. Heat for about 45 minutes at 50-60° and follow the procedure in section (A). Use 10 g of calcium chloride to dehydrate the product, and warm in a water bath for a few minutes to aid the dehydration. The yield is about 35 g. 

D) Preparation of Butanone (M.). The same procedure is used as in the semimicro preparation of butanone section (B). Arrange a 500 ml round-bottom or Florence flask for fractional distillation as shown in Figure 27. The stopper which connects the fractionating column to the flask has an opening for a separatory funnel. The condenser fits through an adapter to a receiving flask immersed in cold water or ice-salt mixture. 

B) Preparation of Benzoic Add (M.). For the preparation of one mole of the Grignard reagent use is made of the apparatus shown in Figure 52. It consists of a three-neck flask having a mercury-seal stirrer. An ordinary 500-ml round-bottom or Florence flask without a stirrer may be used for amounts less than 0.5 mole, although the time required for the preparation is longer. 

B) Preparation of a-Bromopropionic Acid (M.). Arrange a 500-ml Florence flask as shown in Figure 46, without the dropping funnel the absorption train is the same as used in the preparation of chloroacetic acid (page 225). The rubber stopper which connects the reflux condenser to the flask is painted with sodium silicate twice, and allowed to dry each time. 

A) Preparation of Glycine (Sm.). Place 17 g of ammonium carbonate and 15 ml of water in a 125- or 250-ml Florence flask. Warm to 40-50° for 15 minutes and then cool to room temperature. Add 20 ml of concentrated aqueous ammonia, and 5 g of commercial... 

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