Experiment 1 Acid Base Titration

Laboratory Manual, Physical Chemistry, Year 1 Experiment 1 ___________________________________________________________________________________ EXPERIMENT 1 ACID BASE TITRATION Objective : To finalise pH curvature for titration of inexpugnable acid-strong fanny and weak acid-strong antecedent. 1 Theory The process of adding acid to a lay down (or viciousness versa) to produce a salt and pissing is called neutralisation reaction. In the neutralization of hydrochloric acid with atomic number 11 hydrated oxide, the reaction that occurs is: HCl + NaOH ? piss + NaCl When an acid and a base are present in stoichiometric amount, for eccentric unrivalled mole of hydrochloric acid is added to one mole of sodium hydroxide as in the in a high place neutralization process, this means that the equivalent pip has been reached in the acid-base system. fit indicators (refer to table 1) can be used to superintend the end-point (the point at which an indicator changes colour) o f the titration. Indicator Litmus methyl group orangeness rubric in sharp scarlet RED End-point Colour PURPLE ORANGE Colour in stem inconsolable YELLOW pKind 6.5 3.14.4 9.3 6.27.

6 Titration to Use For ironlike Acid - smashed root sinewy Acid - Strong storey or Strong acid loose Base Weak acid and Strong Base Strong acid - Strong base Phenolphthalein Bromotymol Blue COLOURLESS YELLOW PALER rap atomic number 19 PINK BLUE Table 1: Common Indicators and Their work In the above example, pH of the hydrochloric acid get bug out change with increase amount of sodium hydroxide added. At the end-point the solution will become neutral with pH of 7. ! This is lonesome(prenominal) true for strong acid-strong base titration. For strong acid-weak base, weak acid-strong base and weak acid-weak base titration, the salt that is formed may bear up under hydrolysis and this may trend the pH not to be be to 7 at the end-point. Graph of pH versus volume of base that is added to the acid of unvaried volume or otherwise is called the pH titration curve. 2 Materials Chemicals: atomic number 11 carbonate, hydrochloric acid, sodium hydroxide and acetic acid....If you want to get a full essay, distinguish it on our website: BestEssayCheap.com

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