Preparation and Reactions of Boric Acid

To prep argon boracic stinging from sodium deteriorate (borax) To carry come on discharges on the prepa ruddy sample of boracic pungent To study the physical and chemic properties of boracic sulfurous Int terminaluction vitamin B complex is an element in the p-block of the periodic table. It has the electron configuration of 1s22s22p1 and is in group 3 or coup 13 (PUPAS classification). In nature, it consists of two isotopes drink (19. 6%) and BIB (80. 4%). Boron is bonded to the oxygen in nature. The important sources of Boron atomic number 18 borax and kerning.Boron sides and their derivatives atomic number 18 technologic all(prenominal)y important and are comparatively inexpensive to produce. Boron oxides is very problematical to crystallite and normally exists in a glassy state (d=l . CACM-1). Molten bacillus oxide has a high melting stop consonant of 450 degree Celsius that is readily dissolves metal oxides to figure verboten simulationed borate specs as geni us of the main commercial uses of boric oxide. Particularly, borosilicate glasses find wide applications in glassblowing and the proceeds of glass objects. On top of the boric stinging, it is also known as atomic number 1 borate as a weak monobasicLewis bitter. At room temperature, it exists as white grind or colorless crystals with a chemical formula of HOBBS or B(OH)3. Apparatus and materials sodium deteriorate knockout hydrochloric acid Concentrated sulfuric acid Methyl red index finger Imitation Beaker Methanol Distilled weewee Electric heater riddle tobacco pipe seek pipage rack render rod sucking funnel Suction pump pick up flask Filter wallpaper Spatula Watch glass splint Procedures 1 . About log of sodium deteriorate (borax) is dissolved in CACM of wet in a beaker. 2.The incorporateture is turn and CACM of operose hydrochloric is added into the resultant role. 3. The beaker is immersed into a container with ice and piddle to cool down the temperatur e. 4. After the resoluteness is cooled down, the boric acid is crystallized out by using the Boucher funnel, 2 layers of get across papers, suction pump and a filtrateing flask. 5. The be crystals in the beaker and on the glass rod are washed well with cold pissing for a few generation and get acrossed off with the Boucher funnel. 6. The yield is left excursion to be dried and the weight is mensural and recorded.Test 1 1. A little boric acid is inserted into a judge tube. 2. depressed fare of distilled water is added to dissolve the acid in the keepvas tube. 3. A terminate of methyl red index number is added. 4. Test tube is designate as A. 5. travel 1 to 3 are ingeminate again by replacing the acid with the imitation and the exam tube is tagged as B. 6. Half of for each one result in test tube A and B are mixed in a test tube labeled as C. 7. All results and observation are recorded. -rest 2 1. A small amount of boric acid crystals is inserted into a tyran t turn tube. 2.A little ethanol is added into the boiling tube Just to bilk the acid. 3. well-nigh concentrated sulfuric acid is thus added into the tube. 4. The boiling tube is held by a test tube holder and modify on a Bunsen burner. 5. The vapour produced is wakend by using a burning wooden splinter. 6. All observations are recorded. Discussion First and foremost, we managed to yield 4. clump of HOBBS. harmonize to our calculation, the theoretical mass that we are alleged(a) to obtain is 6. Egg. This intend that our portion of yield is 74. 64%. According to Vogues casebook ofPractical Organic Chemistry, yields around 100% are called quantitative, whereas yields above 70% are good. This means that our team did quite a extensive Job. Boric acid is a Lewis acid that is able to interact with the water molecules to picture out hydrogen ions and dehydrogenation ion in the solvent. In test 1, the methyl red index finger is used to determine the acidity of the each radic al in different test tubes. The indicator send word show the pH range at around 4. 4 6. 2. At pH 4. 4, the solution with the indicator will appear to be in red in color and whereas at pH 6. , it will show allow. On test tube A, solution turns from colorless to pink color. This shows that boric acid is a relatively weak acid with pH around 4-5. Next on test tube B, the methyl red indicator is added into a imitation solution. The color of the solution seemed to remain unchanged. It is colorless. In fact, the solution is supposed to change from colorless to yellow. Perhaps, we accidentally do some mistakes by adding the wrong reactant in the experiment or we were a cow dung of too rush deciding the color of the solution without looking at it carefully.Thirdly, when we mix both he solutions from A and B, an backbreaking pink solution is spend a penny. This means that a stronger acid is formed. It can be solely explained by the stronger acid complex formed in between imitation an d boric acid. The pH is less than 4 for sure. According to the test 2 results, a splendiferous discolour ardour is formed when we ignite the vapor with a burning wooden splinter. By mixing the alcohol (methanol) and acid (conch HOSTS) will create ester (CHI)BIBB. An alcohol flame itself is usually, ordinarily colorless. The presence of the gullible in the flame is indicating the ester formed contains boron element.A strong acid like concentrated sulfuric acid is needed to propionate the HOBBS and this will create the electroplate which attacks the O atom of the methanol. Without the organism of a strong acid, an intense green flame might not be formed. This is be obtain ester may not formed and tear down if it is formed, it will exist in equipoise with the alcohol &038 boric acid. Thus, making the green flame not really intense. thither are a few precautionary steps that should be taken during this experiment. Firstly, suction pump used in test 1 is powerful and thus, 2 layer s of imbue papers are seed to cover the holes of the Boucher funnel.From our experience, the suction pump will cause the filter paper to be lacerated if only a piece of filter paper is used. Furthermore, we shall always pour the solution slowly on the rod, so that the solution will flow slowly without causation any wastage. By using this method, we can make sure the crystals are hive away in the middle of the filter paper and it eases our Job to take out the filter paper from the funnel. On top of the safety, all acids are corrosive. In this experiment, we use concentrated hydrochloric acid and concentrated elliptic acid.We shall fail gloves and handle them with extra care to delay and avoid any accident to occur. In addition, a tyrant boiling tube is used kind of of a test tube in test 2 (flame test). A boiling tube can withstand strong heat without breakage. Test 2 (flame test) has to be carried out in the fume hood as the vapor released from the boiling tube is toxic. There fore, we shall remain our hold with the vapor, although the green flame is beautiful. Last tho not least, we shall discard the excess boric acid into the waste bottle instead of basin as to prevent water pollution.