Effect of Ph on Food Preservatives Essay

Sodium Benzoate is a special K food preservative use in food returns such as jams and jellies, barmy drinks, pickles, condiments etc and in tinned products in the market. This look into aimed to acquire whether benzoic astringentulent is create from its superior soluble puzzle come on atomic number 11 benzoate in stomach blistery, which is simulated by HCl (pH=2). It has been seen that at a lowly optimum pH, i.e. in the charge of enough hydrochloric acid, fitting benzoic acid is yielded. The destiny yield is determined from the calculations of the theoretical (stoichiometric) calculations and the real(a) yield from the answer. Also throughout the experiment, nearly basic laboratory operations such as measuring atomic reactor and volume, separating fast(a)s from liquids by vacuum filtration and drying solids are familiarized with. origin The reply of atomic number 11 benzoate and hydrochloric acid is a typical phenomenon of hydrolysis reaction which conforms to the principles of acid-base chemistry and stoichiometry. In a typical hydrolysis reaction, when a saltiness dissolves in water, the salt dissociates to its constituent anions and cations (benzoate and sodium ions respectively). Also, when strong acids like hydrochloric acid dissolves in water, chloride ions and hydronium ions are formed.Hence in the reaction involving sodium benzoate and hydrochloric acid solution, in the presence of high concentration of hydronium ions, protons adjudicateament be transferred from the strong acid H3O+ to the basic benzoate ion. This will yield benzoic acid, C6H5COOH which precipitates from the solution as it has a re tot aloneyy poor solvability (0.34g/100ml). The fundamental reaction is sketched out infra As can be seen from the battle in the pKa values, H3O+ is a much stronger acid than benzoic acid. So, the equilibrium of the reaction potently favours its completion and hence hydrochloric acid which ideally simulates the acidic condition s of the stomach, does convert benzoate to benzoic acid. sentry go Throughout the lab safety goggles, evasive gloves and aprons were worn while carrying out the experiments. bandage transferring the HCl to the reaction ampule in the assimilator hood, the head must never be inside the glass hood as vapour inhalation can spring choking hazard and irritations. Also the hosepipes were cautiously plugged in and out of the separate out flask to avoid breakage or tipping of the Hirsh funnel.Experimental For this experiment and basic operations, graduated Pasteur pipettes, a 5ml conical reaction vial, discover glass, stirring rod, electronic balance, small runnel tube, Hirsh funnel, filter flask and filter piece are used. The procedure for this experiment appears on page 7 of the lab manual, Multiscale total Chemistry (4th custom UB edition)3.As the elemental objective of this experiment was to find out whether sodium benzoate reacts with simulated stomach acid to form benzoic a cid, the results clearly orient that a successful reaction button up to completion, if not fully complete, has feignn place. The ploughshare yield calculation reveals that approximately 90% of benzoic acid as uninfected precipitate were recovered from the reaction.There were a number of factors which king gift contributed to the 10% deficiency in the final yield. It involve to be menti angiotensin-converting enzymed though that a character yield of less than 100% is achieved because the drying of the solid mass after vacuum filtration was sufficient to give a pragmatic number. During measurements of mass of benzoate and benzoic acid when its formed, thither were obvious human errors involved. Some benzoates were unconnected while transferring to the conical reaction vial from the watch glasses, and further loss of the product benzoic acid might have taken place when the solution mix was tipped on the Hirsh funnel.We couldnt determine if the reaction was complete or not, so we might not have had all the salt converted 4. The solution might not have sufficiently and in stages cooled though every effort was do for that, hence there could be lose of benzoic acid crystals forming. The litmus test might have contributed to a world-shattering loss of the precipitate, but only one instead of multiple tests were performed to see if the reaction mixture was acidic enough. Given the carefully controlled experiments and the 90% yield, it can be deemed that the methods used to perform the experiments are full cogent evidence and performed as immaculately as potential. shutting The fact that a new internality is formed indeed when sodium benzoate is fixed into a simulated stomach acid has been demonstrated successfully with the aid of the experiments and aforesaid(prenominal) results. A 90% yield suggests that all the basic operations were carried out as neatly and carefully as possible and measures taken to minimize obvious errors which could take place while performing the experiments. tout ensemble in all, the experiment provided a practical evidence of the theory behind the hydrolysis of sodium benzoate and percentage yield of its product.