prelab8.docx - Title Determination of pKa of Bromocresol Green Purpose The purpose of this lab is to determine the pKa of Bromocresol Green by using

prelab8.docx - Title Determination of pKa of Bromocresol...

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Title: Determination of pKa of Bromocresol Green Purpose: The purpose of this lab is to determine the pKa of Bromocresol Green by using spectrophotometry Materials: 0.20 grams of Bromocresol Green ( C 21 H 14 Br 4 O 5 S ), 500 mL of 95% ethanol or reagent alcohol, 1M of NaOH solution which is a volumetric standard, 1L of 0.1M acetic acid, 1L of 0.2M sodium acetate, 500mL of 0.1M HCl, 100 mL of 0.1M NaOH, pH 4 buffer, pH 10 buffer, pH meter, Ocean optics, Kimwipes, and parafilm. Safety: ( C 21 H 14 Br 4 O 5 S )- no hazards identified 95% ethanol- flammable, toxic, health hazard, irritant, toxic if swallowed, may cause drowsiness or dizziness NaOH- corrosive, serious eye damage, corrosive to metals Sodium acetate-not classified as physical or health hazard HCl- Corrosive, irritant, skin corrosion, organ toxicity, causes severe skin burns Procedure: Bring beaker to Obtain stock solutions of acetic acid, sodium
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