12 a Expriment

Topics: Chromates, Chromate, Sodium Pages: 3 (577 words) Published: November 10, 2012
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Experiment 12A Investigating chemical equilibrium
ABSTRACT 1. What is equilibrium and how can you tell it has been reached? __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ 2. What is a “stress” and how does it affect an equilibrium? __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ 3. What are the 4 objectives to this experiment? __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________

MATERIALS AND PROCEDURE As per Essential Experiments for Chemistry pages 163–170

RESULTS TABLE 1 Equilibrium involving bromocresol green Initial colour of bromocresol green in water = Reagent added HCl (step 3) more HCl (step 4) NaOH (step 5) more NaOH (step 6) Stress Colour change and # of drops required Direction of shift

ver. 02/2012

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Chemistry 12

Unit 2 Reaction Equilibrium

TABLE 2 Equilibrium involving iron(III) thiocyanate ion Colour of FeCl3...
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