Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Bronsted-Lowry base in inorganic chemistry is any chemical substance that can accept a proton from the other chemical substance it is reacting with.
Question

(5)  a) A nitrous acid/sodium nitrite buffer solution is prepared.  20.0 mL of 6.50 M nitrous acid (HNO2) and 8.52 g of sodium nitrite (NaNO2, molar mass 68.99 g/mol)  are placed in a 250. mL volumetric flask.  The flask is filled to the mark with water and inverted 10 times to mix thoroughly.  What is the pH of this buffer? Take Ka for Nitrous Acid to be 4.52 x 10-4.

 

 

 

 

 

                                                                                                                                    pH:                 

  1. b) 2.00 mL of a 2.50 M solution of NaOH is added to 75.0 mL of the buffer prepared above. What is the pH of this solution?  How much did the pH change? 

 

 

 

 

                                                                                                pH:                      change in pH:         

  1. c) What is the pH of pure distilled water (just give the pH, no calculations are necessary).

                                   

  1. d) If 2.00 mL of 2.50 M NaOH is added to 75.0 mL of distilled water, what is the pH of this solution? How much did the pH change when base was added to distilled water? Compare this to your answer for (b)

 

 

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