Besides water the loss will include other matter volatile at 105 ºC [2,4]. Sample of five grams was weighed into a pre-weighted flat dish (W1) and dried at an oven temperature at 105 ºC for 3 h (W2). It was allowed to cool in an airtight desiccator, reweighed and again heated in the oven for half
The mixture was placed in a water bath (90ºC) for 10 minutes to allow the reaction to be completed. After the reaction has being completed, the test tube was removed and allowed to be cooled. The alcohol (methyl alcohol) loses OH while the carboxylic acid (salicyclic acid) loses a H. The method which is used in this experiment is only suitable for preparing small amounts of ester. The ester which is formed also can only be categorized by odour. After it has cooled, the fumes was carefully walf by passing our hand over the top of the tube towards our
Ensure that solid is completely dissolved using a stirring rod. Next, a 10 mL beaker is filled with 3 mL of HCl and measure 10 mL of ionized water into a 140 mL beaker. Carefully turn on laboratory burner and start cleaning the Nichrome wire by dipping it into concentrated HCl acid. Hold the Nichrome wire on top of the flame and repeat the step until the wire doesn 't show any color. When the wire is clean, dip the wire again with some of the acid and dip it into the solution with the unknown compound in it.
Stored in light glass bottle. 2.5.2: Formation of PANI(CoFe2O4) 0.1g of Nano material and 50ml of Aniline hydrochloride were mixed in a beaker. Then 50ml of Ammonium peroxydisulphate was added drop wise in reaction mixture with constant stirring below 20 oC. After 24 hours the coated sample was filtered, washed and dried at 60 oC in oven and then grinded into a fine powder in agate
Iodine number is the number of grams of iodine or iodine compound absorbed by 100gm of oil. It is found that saponification and iodine value of sunflower oil are 144 and 133 respectively. Even though there are different kinds of vegetables, this study is limited to sunflower oil. Keywords: Sunflower Oil, Iodine Value and Saponification Value. SUNFLOWER OIL Sunflower Oil is the non-volatile oil expressed from sunflower (Helianthus annuus) seeds.
Materials and synthesis Poly (viny alcohol) (PVA) (99%, Mw. 1,15,000; Loba ) was dried in a hot air oven about 80 ºC at least 12 hours before to use. Poly(oxy-1,4-phenylenecarbonyl-1,4-phenylene) (Mw. 20,800; Sigma aldrich) (PEEK) pellets were dried at 100 ºC in hot air oven overnight before to the sulfonation process. Montmorillonite K10 (Na+MMT) (Himadia), Ion exchange resin (CDH), sulfuric acid (1.84 g cm-3, 98 wt%; Merck), Dimethyl sulfoxide (DMSO) and methanol were used as recieved.
Remove all HNO3 before continuing treatment. All HNO3 will be removed when the solution is clear and no brownish fumes are evident. Do not let the sample dry during this digestion. (ix) Cool and dilute to about 50 ml with water. Heat to almost boiling to dissolve soluble salts slowly.
0.825 g Na2WO4H2O (2.5 mmol), desired amounts of acidic ligand and 44.5 mL 30% hydrogen peroxide (440 mmol) placed in an 100 mL flask, stirred for 10–15 min to get a clear solution at room temperature. Then 10.5 mL cyclohexanone (100 mmol) added into it without stopping stirring. Continue stirring the reaction mixture at a reflux temperature for 8 h. After completion of the reaction, the reaction mixture cooled in the refrigerator for 12 h. Then white crystalline product obtained after filtration, washed with an ice water and dried in the air. The product weighted and the isolated yield of the adipic acid calculated which is based on the cyclohexanone that was put in the reaction flask. Mechanism: Experiment No.
Then gum solution was kept to allow without disturbance up to 12 h at room temperature to detach any undissolved matter. Followed by the PC gum solution was filtered by triple folded muslin cloth and evaporated up to one third of original volume using a rotary vacuum evaporator then cooled and precipitated with isopropanol and air dried. The end product was passed via sieve (no. 85) and stored in desiccators whenever the PC gum was used. 2.3.
Preheat the die using muffle furnace in order to remove the moisture content, and the chilling effects reduced. 4. Once the A356.1 Aluminium alloy melts (Fig 4.2(c)), degassing tablets are added into the crucible in order to remove the gases and it facilitates slag removal (Fig 4.2(d)). 5. Stirring set up is brought near the furnace and the stirrer is dipped in to the molten metal and the speed of stirring is maintained at 100rpm.