![10. A particular variety of beer has a pH of 4.2. (a) What is the molarity of the hydrogen ion? [H+] (2) (b) What is the mola](http://img.homeworklib.com/questions/1a59c1e0-7254-11ea-8ec7-e747f1896daf.png?x-oss-process=image/resize,w_560)
Homework Answers
a)
Molarity ( concentration ) of hydrogen ion can be calculated from the pH of a solution. As we know, pH is the negative logarithm of the concentration of hydrogen ions (H+).
![pH = -log[ht] [ht] = 10PH =10 4.2 = 0.000063 m = 6.3x108 M](http://img.homeworklib.com/questions/1b06c5a0-7254-11ea-922f-cfc770192047.png?x-oss-process=image/resize,w_560)
So molarity of hydrogen ion is 6.3×10-5 M
b)
Molarity of the hydroxide ion can be calculated from the molarity of hydrogen ion as follows.
![We have the equation [ht] [OH-] = 1x1004 [OH-] = 1x104 [14] We have [list] = 6.3x10 3 M . [OH] = 1x10th 6.3x105 = 1.587*10 m](http://img.homeworklib.com/questions/1baf3bc0-7254-11ea-861b-bd04f523ffd1.png?x-oss-process=image/resize,w_560)
So molarity of the hydroxide ion is 1.587×10-10 M
c)
POH Can be can be calculated from the pH of a solution.
So, pOH for the given compound is 9.8
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