Answer the following question briefly: 1. Why do we need to calibrate the pH meter before using?

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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Answer the following question briefly:

1. Why do we need to calibrate the pH meter before using?

2. Why distilled water is used in washing the electrodes after testing each sample?

3.  Compare the pH value of the following compounds:    

 a. Acetic acid and monochloroacetic acid    

b. Acetamide and acetone    

c. Glycine and lysine    

d. Isopropyl alcohol and phenol

 

4.  Which of the following sample above are classified as stated below. Support your answer by writing the structural formula and encircling the part that makes it acidic, basic or neutral as the case may be:    

a. Bronsted acid    

b. Bronsted base    

c.  Lewis acid    

d.  Lewis base

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