University:
Hunter College CUNY
Course:
CHEM 106 | General Chemistry Laboratory
Academic year:

2019
Views:

381

Pages:

6
Author:

Dominick Dickson

Experiment: Determination of Solution Concentration vis Titration Title: Determination of Solution Concentration vis Titration Purpose: Understand what titration, ionic equation and net ionic equation are. Determine moles number by using molarity and volume. Introduction: There is always a chemical reaction that happens when two different solutes are mixed. Water as the solvent provides the medium in which the reaction takes place, and water will not react. Titrations determine the concentration of an identified analyte, and it is used as a lab method of quantitative chemical analysis. Metathesis, also knowing as a double replacement, is a reaction in which the positive and negative ions of two ionic compounds exchange places to form two new compounds. The ionic equation is a chemical equation in which the dissolved ionic compounds are written as separated ions. The net ionic equation is the equation that removes spectator ions, and it represents the actual chemical change occurring between the ionic compounds. Materials Use: vinegar, 100 mL beaker, three of 125 mL Erlenmeyer flasks, deionized water, NaOH solution, phenolphthalein solutions, volumetric pipette, pipette bulb, burette, ring stand, funnel, paper. Safety Precautions: Wear safety glasses, lab coat, gloves in the lab. Beware of acids and bases. Procedure: 1. Place three of 125 mL Erlenmeyer flasks and 30 mL of vinegar in a 100 mL beaker. Transfer 10.00 mL of vinegar from this beaker should be using a volumetric pipette and pipette bulb into each flask. Record the data to the datasheet. 2. Add about 10 mL of deionized water and three drops of phenolphthalein to each flask. 3. Clamp a burette to a ring stand and fill the burette with an aqueous 0.5 M NaOH solution by using a funnel. Make sure there is no air in the top. Record the data. 4. Place paper under the flask, and the flask should be under the burette, so the NaOH solution in the burette could be dropwise into the flask. Then swirling the flask until the solution turns to pink color and add some deionized water while swirling. Record the data of the volume of the burette. 5. Refill the burette and repeat step 4 for another two Erlenmeyer flasks, and record the data. Calculation and Results: Data Sheet Sources of error The vinegar that adds in flasks must be exactly 10.00ml; otherwise, it will affect the result. Questions ：