Preparation and Reactions of Boric Acid

To prep be boric acetous from sodium unload (borax) To carry divulge canvass on the prep bed sample of boric vitriolic To study the physical and chemical properties of boric window glass Int terminaluction vitamin B is an element in the p-block of the periodic table. It has the electron configuration of 1s22s22p1 and is in conclave 3 or coup 13 (PUPAS classification). In nature, it consists of two iso tree chokees drink (19. 6%) and BIB (80. 4%). Boron is bonded to the oxygen in nature. The alpha sources of Boron are borax and kerning.Boron sides and their derivatives are technologarithmically important and are comparatively inexpensive to produce. Boron oxides is very difficult to crystallite and normally exists in a glassy state (d=l . CACM-1). Molten boron oxide has a amply melting point of 450 degree Celsius that is readily dissolves metal oxides to form aslope borate specs as one of the main commercial uses of boric oxide. Particularly, borosilicate glasses find wid e applications in glassblowing and the production of glass objects. On top of the boric acid, it is also known as hydrogen borate as a namby-pamby monobasicLewis acid. At room temperature, it exists as white powder or colorless crystals with a chemical formula of HOBBS or B(OH)3. Apparatus and materials sodium deteriorate Concentrated hydrochloric acid Concentrated sulfuric acid methyl group red index Imitation Beaker Methanol Distilled water Electric pot Test organ pipe Test subway system rack Glass rod Suction funnel Suction pump perk up flask Filter idea Spatula Watch glass Splint Procedures 1 . Ab come on log of sodium deteriorate (borax) is dissolved in CACM of water in a beaker. 2.The mixture is boiled and CACM of knockout hydrochloric is added into the effect. 3. The beaker is immersed into a container with ice and water to simmer down down the temperature. 4. After the dissolvent is cooled down, the boric acid is crystallized out by utilize the Boucher funnel, 2 layers of filter papers, sucking pump and a filtering flask. 5. The remaining crystals in the beaker and on the glass rod are process well with ice-cold water for a few times and filtered dispatch with the Boucher funnel. 6. The yield is left aside to be dried and the weight is measurable and recorded.Test 1 1. A little boric acid is inserted into a tally provide. 2. Small amount of distilled water is added to dissolve the acid in the canvasing render. 3. A drop of methyl red indicator is added. 4. Test tube is labeled as A. 5. Steps 1 to 3 are ingeminate again by replacing the acid with the imitation and the bear witness tube is labeled as B. 6. Half of each ancestor 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 Tyrant stewing tube. 2.A little ethanol is added into the boiling tube meet to cover the acid. 3. Some concentrated sulfuric acid is t hen added into the tube. 4. The boiling tube is held by a test tube holder and alter on a Bunsen burner. 5. The vapor produced is eruptd by using a burning wooden splinter. 6. All observations are recorded. Discussion primary and foremost, we managed to yield 4. Egg of HOBBS. According to our calculation, the theoretical mass that we are suppositious to obtain is 6. Egg. This means that our percentage of yield is 74. 64%. According to Vogues text edition ofPractical Organic Chemistry, yields around 100% are called quantitative, whereas yields above 70% are good. This means that our team did quite a great Job. Boric acid is a Lewis acid that is able to interact with the water molecules to give out hydrogen ions and dehydrogenation ion in the solution. In test 1, the methyl red indicator is used to determine the acidity of the each solution in disparate test tubes. The indicator can show the pH range at around 4. 4 6. 2. At pH 4. 4, the solution with the indicator forget appea r 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 by the bye made some mistakes by adding the wrong reactant in the experiment or we were a bit 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 exquisite pink solution is formed. This means that a pie-eyeder acid is formed. It can be simply explained by the stronger acid complex formed in amidst imitation and boric acid. The pH is less than 4 for sure. According to the test 2 results, a beautiful green flame is formed when we ignite the vapor with a burning wooden spl inter. By mixing the intoxicant (methanol) and acid (conch HOSTS) will cause ester (CHI)BIBB. An alcoholic beverage flame itself is usually, ordinarily colorless. The presence of the green 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 existence of a strong acid, an discriminating green flame might non be formed. This is because ester may not formed and even if it is formed, it will exist in equilibrium with the alcohol & boric acid. Thus, making the green flame not really intense. thither are a few precautionary steps that should be interpreted during this experiment. Firstly, suction pump used in test 1 is reigning and thus, 2 layers of filter papers are seed to cover the holes of the Boucher funnel.From our experience, the suction pump will cause the filter paper to be torn if only a piece of filter paper is used. Furthermore, we shall always move the solution slowly on the rod, so that the solution will flowing slowly without causing any wastage. By using this method, we can put up sure the crystals are accumulated 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 wear gloves and handle them with extra care to prevent and rescind any accident to occur. In addition, a tyrant boiling tube is used instead 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 stink hood as the vapor released from the boiling tube is toxic. Therefore, we shall remain our space with the vapor, although the green flame is beautiful. Last but not least, we shall discard the surplusage boric acid i nto the waste bottle instead of basin as to prevent water pollution.