Chemistry Lab Report free essay sample

An acid-base titration is a procedure used in quantitative chemical analysis to determine the concentration of either an acid or a base. Titration is the slow addition of an acid (or a base) of known concentration from a burette (a narrow graduated cylinder) to a base (or an acid) of unknown concentration fin an Erlenmeyer flask. There are two types of acids: strong acid and weak acid, and also two types of bases: strong base and weak base. Therefore four types of acid-base titrations are possible: strong acid-strong base, strong base-weak acid, weak acid-strong base and strong acid-weak base titrations. Acid + Base Salt + Water The end point occurs when the stoichiometric amount of base (or acid) has been added to the acid (or the base). The end point is frequently detected using a visual indicator. An acid-base indicator is a substance, which changes colour with pH. Objective The main objective is to discover/determine the unknown acid sample using titration method and to calculate volume to neutralize acid sample. We will write a custom essay sample on Chemistry Lab Report or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page The aim of the experiment is to determine the molarity and percent by weight of acetic acid in the vinegar solution through titration method, using standard solution— sodium hydroxide solution. The standardization of sodium hydroxide solution uses KHP solution and also phenolphthalein (an acid-base indicator). The calculation selection is using formula of Stoichiometry and others. The aim of the experiments is also to learn the ways to conduct experiment safe and properly, and the importance of teamwork and leading skill. Hypothesis In part A When sodium hydroxide solution is prepared by dissolving sodium hydroxide pellets with distilled water, colourless solution will be observed. In part B If 3-5 drops of phenolphthalein are added to 20 mL of 0. 1 M KHP solution, a pink solution will be found. The prepared sodium hydroxide solution is added from burette into the KHP solution in the flask and it is swirled constantly during the process.