What is the pH of a buffer made from 0.42 M H3BO3 and 0.32 M H2BO3-, if the Ka for H3BO3 is 7.3 x 10-10 ? (use 2 decimal places for pH)

Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter15: Acid–base Equilibria
Section: Chapter Questions
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If applicable, ensure you include all units and formulas used and you follow significant figure rules. 

4.  What is the pH of a buffer made from 0.42 M H3BO3 and 0.32 M H2BO3-, if the Ka for H3BOis 7.3 x 10-10 (use 2 decimal places for pH) 

 

5.  Write a balanced chemical equation for the following reactions:  **You do not need to indicate s, l, g or aq.**

a)     potassium carbonate and hydrobromic acid

b)    solid magnesium metal and phosphoric acid

 

6. If 46.3 mL of a 0.794 M Ca(OH)2 solution is required to neutralize a 40.0 mL sample of HCl, what is the molarity of the acid solution? ensure you write a balanced neutralization reaction.

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