W2003ExpI101 - page 7 of 12

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I-7

OBSERVATIONS SHEET - EXPERIMENT I

BUFFER SOLUTIONS

Part I.

Preparation of the Acetic Acid-Acetate Buffer Solution

A. acetic acid solution

____________ M

pH ___________

(See demonstration set up.)

B. sodium acetate solution ____________ M

pH ___________

(See demonstration set up.)

C. initial pH of acetic acid-acetate buffer solution

pH ___________

Part II.

Effect of the Addition of a Strong Acid on Deionized Water

pH of pure water

____________

pH of water after the addition of 2 drops of 0.20 M HCl

____________

Part III. Study of the Buffer Solutions

Determine the Effect of Dilution on the Buffer Solutions

Part III

acetic acid-acetate buffer

Part IV

commercial buffer

pH of the initial undiluted buffer solution

(repeated from above)

____________

pH of the buffer solution after dilution

____________

___________________________

_____________________________

_______________

Signature of Laboratory Instructor

Name of Student

Laboratory Section