ACID-BASE TITRATION
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Titration: It is the determination of the unknown concentration of a solution from another with known concentration. Glassware: Burette and Erlenmeyer Reagents: Vinegar and NaOH Indicator: Phenolphthalein QUESTIONS: 01- Titration is a laboratory procedure that allows determining the unknown concentration of a substance from a substance of known concentration. In a titration represented by the equation: the equipment used to carefully add the appropriate volume of NaOH solution is called a) graduated pipette. b) test tube. c) burette. d) volumetric pipette. 02- Milk of magnesia, used as an antacid and laxative, contains the compound Mg(OH)2 in its formulation. The concentration of a 10 mL sample of milk of magnesia that was titrated with 12.5 mL of 0.50 mol.L–1 is, in mol.L–1, approximately a) 0.1. b) 0.3. c) 0.5. d) 0.6. e) 1.2. 03- One of the parameters that determines the quality of olive oil is its acidity, normally expressed on the packaging as a percentage, and which can be directly associated with the oleic acid content in its composition. A sample of a commercial olive oil was added to a solution containing ethanol and ethoxyethane (diethyl ether), in volume, with the indicator phenolphthalein. Under constant stirring, it was titrated with an ethanolic solution containing up to total __________. For this sample, they used the base, which allows us to conclude that it is a __________ type of olive oil. The words that correctly complete the gaps are: Note and adopt: Classification of olive oils by acidity (in mass of oleic acid per olive oil): Type Acidity Extra virgin Less than Virgin fine From to Semi-fine Greater than to Refined Greater than Oleic acid (acid octadec-9-enoico) Formula: Molar mass = a) oxidation; semifine. b) neutralization; thin virgin. c) oxidation, virgin fine. d) neutralization; extra virgin. e) neutralization, semifine.
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