aboratory 8 Acid-Base Titration Determination of the Concentation of an Unknown

Question

aboratory 8 Acid-Base Titration Determination of the Concentation of an Unknown Acid Solution NAME DATE INSTRUCTOR SECTION: IN-LAB GUIDELINES This is a guide to allow you to prepare your Laboratory Notebook so that you can efficiently collect and record the data needed for each part ofthis experiment. Provide a space for observations of events, etc. that might affect your data. Record your data the Laboratory Notebook. Turn in the duplicate pages of your observations (not this guide) to your Instructor before you leave the laboratory period.) Standardization of NaOH solution Sample 1 Sample 2 Sample 3 Weight KHP used L Initial buret reading mL Final buret reading mL. mL Vol. NaOH used m Observations (list any observations you see during this titration KHP that didn't dissolve or may have been stuck to the neck of the flask, what was the relative intensity ofthe color of phenolphthalein at the endpoint are the colors the same, did the color disappear too fast?)

Explanation / Answer

Ans;- The values can be writte in tabular form;-

Now The following observation can be made

1) Volume of NaOH used is almost similar

2) The end point after adding pheolphthalein indicator is light pink and it persist for almost 40 seconds and it was same for all the three trials.

Now Let us write the data for acetic acid

The following observation is made

1) Volume of NaOH used is almost same for all the three trials

2) The end point is pink colour which indicates the completion of titration and it last for 30 seconds

Sample 1 sample2 sample3 weight of KHP used 0.43 0.425 0.4211 initial buret reading 0 15.9 30.9 final buret reading 15.9 30.9 46.5 volume of NaOH used 15.9 15 15.6

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