Lab 5 Report

Lab 5 Report - INV38 Lab 5 10/25 Investigation # 38 What Is...

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INV38 Lab 5 10/25 Investigation # 38 What Is the Acid Dissociation Constant? Investigation Team Members: Group 1: Shuangchao Ma, Albert Hsia, John Thompson. 10/25/2007 1
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INV38 Lab 5 10/25 Introduction: The identification for different chemicals is always important, and the one of the basic principles mainly depends on the acid dissociation constant. In this experiment, standardized base was need to neutralize the unknown acid so that the morality of the solution of the weak acid can be determined. Two methods were carried out to gain the Ka while several trials were carried out, and graphical relationship between pH and added NaOH is required as well. The average of Ka will be taken to finally explore the identity of the weak acid. Following equations were used: (1) HA(aq) + H 2 O (l) H 3 O + (aq)+ A - (aq) (2) Ka = ([H 3 O + ] eq [A - ] eq )/([HA] eq ) = (10 -PH ) 2 /C(HA) (For Method 1) (3) C(HA)V(HA) = C(NaOH) V(NaOH) = (10 -PH ) 2 /C(HA) (4) PKa = PH 1/2 Ka = 10 -PKa (For Method 2) Experimental: Materials n Equipment Quantity Flask and Cylinder As Needed Burets and Other Volumetric Measuring Equipment As Needed PH meter 1 2
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INV38 Lab 5 10/25 Buffer Solutions to Calibrate PH meter As Needed Tissues As Needed Flasks and Pipets As Needed Material Amount 0.1M NaOH (aq) (standardized) As Needed Unknown Weak Acid Solution As Needed Procedure Before started any of the following trail, the pH meter was set up properly as the introduction indicated. The buret was cleaned by pure water and then wash with NaOH one time. The bubble was ignored afterwards by NaOH solution as well. Other related containers were washed carefully before used. For each trial, 15ml of the acid was placed in a flask under the buret and all the things were recleaned before anther trial began. The first trail was carried out while 1ml of base was controlled to flow into the flask each
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This note was uploaded on 04/17/2008 for the course CHM 116 taught by Professor Unknown during the Fall '08 term at ASU.

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Lab 5 Report - INV38 Lab 5 10/25 Investigation # 38 What Is...

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