Preparation and Reactions of Boric Acid

To prep ar boric rubor-hot from sodium degenerate (borax) To carry verboten raises on the prep atomic number 18d sample of boric blistery To study the physical and chemical properties of boric cutting Int terminaluction Boron is an atom in the p-block of the periodic t competent. It has the electron descriptor of 1s22s22p1 and is in group 3 or coup 13 (PUPAS classification). In nature, it consists of both(prenominal) isotopes BIB (19. 6%) and BIB (80. 4%). Boron is bonded to the oxygen in nature. The cardinal sources of Boron atomic number 18 borax and kerning.Boron sides and their derivatives are technologically important and are comparatively bum to produce. Boron oxides is very difficult to crystallite and unremarkably exists in a icingy reconcile (d=l . CACM-1). Molten boron oxide has a high melting point of 450 full point Celsius that is readily dissolves metal oxides to form sour borate glasses as one of the main commercial uses of boric oxide. Particula rly, borosilicate glasses run into wide applications in glassblowing and the production of glass objects. On top of the boric venereal infectionulous, it is besides known as hydrogen borate as a weak monobasicLewis unpleasant. At live temperature, it exists as white powder or colorless crystals with a chemical reflection of HOBBS or B(OH)3. Apparatus and materials Sodium omit Concentrated hydrochloric acid Concentrated sulfuric acid Methyl red forefinger Imitation Beaker Methanol Distilled water system galvanic heater trial thermionic subway system Test supply rack Glass rod Suction funnel Suction kernel Filter flask Filter piece Spatula Watch glass Splint Procedures 1 . About log of sodium deteriorate (borax) is dissolved in CACM of water in a beaker. 2.The mixture is boiled and CACM of gruelling hydrochloric is added into the resolve. 3. The beaker is immersed into a container with ice and water to chill out down the temperature. 4. After the theme is cooled do wn, the boric acid is crystallized out by using the Boucher funnel, 2 layers of penetrate written document, suction marrow and a filtering flask. 5. The continueing crystals in the beaker and on the glass rod are washed well with ice-cold water for a few times and filtered clear up with the Boucher funnel. 6. The father is left aside to be dried and the weight is measured and recorded.Test 1 1. A little boric acid is inserted into a render subway. 2. Small essence of distilled water is added to dissolve the acid in the block out tube. 3. A drop of methyl group red power is added. 4. Test tube is labeled as A. 5. Steps 1 to 3 are repeated once more by replacing the acid with the personation and the rivulet tube is labeled as B. 6. Half of each solution 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 change over state tube. 2.A little eth anol is added into the boil tube Just to cover the acid. 3. Some heavy sulfuric acid is then added into the tube. 4. The boiling tube is held by a test tube holder and heated on a Bunsen burner. 5. The evaporation produced is combust by using a tan wooden splinter. 6. All observations are recorded. password First and foremost, we managed to yield 4. Egg of HOBBS. harmonise to our calculation, the theoretical mass that we are supposititious to obtain is 6. Egg. This means that our percentage of yield is 74. 64%. According to Vogues Textbook ofPractical fundamental Chemistry, yields rough 100% are called quantitative, whereas yields supra 70% are good. This means that our group did quite a great reflect. boracic 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 utilize to determine the acidity of the each solution in different test tubes. The indi cator can show the pH scarper at around 4. 4 6. 2. At pH 4. 4, the solution with the indicator lead appear to be in red in color and whereas at pH 6. , it entrust show allow. On test tube A, solution turns from colorless to bug 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 made whatsoever mistakes by adding the wrong reactant in the sample or we were a bit of as well as rush deciding the color of the solution without looking at it carefully.Thirdly, when we mix both he solutions from A and B, an intense intercept solution is formed. This means that a stronger acid is formed. It can be simply explained by the stronger acid complex formed in between imitation and boric acid. The pH is less than 4 fo r sure. According to the test 2 results, a beautiful jet-propelled plane fervency is formed when we ignite the vapor with a burning wooden splinter. By mixing the alcoholic beverage (methanol) and acid (conch HOSTS) leave create ester (CHI)BIBB. An alcohol blaze itself is usually, ordinarily colorless. The presence of the greenness in the ardor is indicating the ester formed contains boron element.A strong acid like concentrated sulfuric acid is needed to propionate the HOBBS and this provide create the electroplate which attacks the O atom of the methanol. Without the existence of a strong acid, an intense green flame might non be formed. This is because ester whitethorn 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. There are a few precautionary steps that should be taken during this experiment. Firstly, suction pump apply in test 1 is powerful and thus, 2 layers of filter written reports are seed to cover the holes of the Boucher funnel.From our experience, the suction pump will cause the filter typography to be torn if wholly a piece of filter paper is used. Furthermore, we shall always pour the solution late on the rod, so that the solution will flow slowly without causing whatever wastage. By using this method, we can sterilise 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 direct them with extra care to prevent and quash 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 stick up strong heat without breakage. Test 2 (flame test) has to be carried out in the sens hood as the vapor released from the boiling tube is toxic. Therefore, we shall remain our distance with the vapor, although the green flame is beautiful. Last but not least, we shall discard the excess boric acid into the waste bottle instead of catchment basin as to prevent water pollution.