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Titration of Acids and Bases
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Title: Titration of Acids and Bases
Description: CHEMISTRY
April 21, 2020

LEARNING OBJECTIVES:
    1) Define the terms indicator, titration, endpoint (equivalence point), standard solution.
    2) Know the color change of litmus, phenolpthalein and bromthymol blue in acids/bases.
    3) Understand how to titrate a solution to determine the concentration of an unknown (including making a calibration curve).
    4) Be able to calculate the concentration of an unknown solution from titration data.

Introduction to titration using an acid and a base with an indicator.

Show indicators: bromthymol blue (blue - base) --> (yellow - acid)
                        phenolpthalein (colorless - acid) --> (pink - base)
                        universal indicator (ROYGBIV) pH 4-10
                        litmus paper (red --> blue...base) and (blue --> red...acid)
                        pH paper - use glass rod to touch paper (don't dip paper into solution).

 

Demonstrate titration using 0.3 M HCl to titrate an unknown base (NaOH).
    Show how to read buret and record data.
    Calculate the concentration of the base (M1V1 = M2V2).
    Show students the actual value of base and it will be same as what is calculated.

Video on Titration:                                                                                                       Setting Up and Performing a Titration video:

        


How to make a calibration curve


LAB: Students will collect 5 data points using 0.3 M acid and an unknown concentration of base.
    Students will graph acid vs base concentration on a graph and calculate the Molarity of the base for each trial (reporting the average molarity).

Homework:    Titration WS
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