Download - PH of Strong Base
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pH of Strong BasesPART III
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In order for you to obtain the pH of strongbases, you must be able to recognize astrong base.
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In order for you to obtain the pH of strongbases, you must be able to recognize astrong base.
If you do not know how to recognize an baseor if you do not know which ones are strong,this slide show may be useless to you.
Go back and learn the difference betweenstrong soluble bases, insoluble (slightlysoluble) bases and weak soluble bases!
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In order for you to obtain the pH of strongbases, you must be able to recognize astrong base.
If you do not know how to recognize an baseor if you do not know which ones are strong,this slide show may be useless to you.
Go back and learn the difference betweenstrong soluble bases, insoluble (slightlysoluble) bases and weak soluble bases!
A review of Brnsted-Lowry acid-baseconcepts would also be helpful.
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pH of Strong Bases
The strong soluble bases are either from the group I metalhydroxides or the group II metal hydroxides. These are solidswhen not dissolved in water and completely ionize* whendissolved in water.
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pH of Strong Bases
The strong soluble bases are either from the group I metalhydroxides or the group II metal hydroxides. These are solidswhen not dissolved in water and completely ionize* whendissolved in water.
Group I: MOH ! M+ + OH!
Group II: M(OH)2 ! M2+ + 2OH!
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pH of Strong Bases
The strong soluble bases are either from the group I metalhydroxides or the group II metal hydroxides. These are solidswhen not dissolved in water and completely ionize* whendissolved in water.
Group I: MOH ! M+ + OH!
Group II: M(OH)2 ! M2+ + 2OH!
Thus for group I, the molarity of the OH! ion is the same asthat calculated for the formal concentration of the hydroxide.
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pH of Strong Bases
The strong soluble bases are either from the group I metalhydroxides or the group II metal hydroxides. These are solidswhen not dissolved in water and completely ionize* whendissolved in water.
Group I: MOH ! M+ + OH!
Group II: M(OH)2 ! M2+ + 2OH!
Thus for group I, the molarity of the OH! ion is the same asthat calculated for the formal concentration of the hydroxide.
Group I: [OH!] = CM(MOH)
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pH of Strong BasespH of Strong Bases
The strong soluble bases are either from the group I metalhydroxides or the group II metal hydroxides. These are solidswhen not dissolved in water and completely ionize* whendissolved in water.
Group I: MOH ! M+ + OH!
Group II: M(OH)2 ! M2+ + 2OH!
Thus for group I, the molarity of the OH! ion is the same asthat calculated for the formal concentration of the hydroxide.
Group I: [OH!] = CM(MOH)For group II, the molarity of the OH! ion is twice that of theformal concentration of the hydroxide.
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pH of Strong BasespH of Strong Bases
The strong soluble bases are either from the group I metalhydroxides or the group II metal hydroxides. These are solidswhen not dissolved in water and completely ionize* whendissolved in water.
Group I: MOH ! M+ + OH!
Group II: M(OH)2 ! M2+ + 2OH!
Thus for group I, the molarity of the OH! ion is the same asthat calculated for the formal concentration of the hydroxide.
Group I: [OH!] = CM(MOH)For group II, the molarity of the OH! ion is twice that of theformal concentration of the hydroxide.
Group II: [OH!] = 2CM(M(OH)2)
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Example 1: What is the pH for a solution of 0.015 M NaOH?
pH of Strong Bases
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Example 1: What is the pH for a solution of 0.015 M NaOH?
This is a group I metal hydroxide, therefore:
pH of Strong Bases
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Example 1: What is the pH for a solution of 0.015 M NaOH?
This is a group I metal hydroxide, therefore:
[OH!] = CM(MOH)
pH of Strong Bases
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Example 1: What is the pH for a solution of 0.015 M NaOH?
This is a group I metal hydroxide, therefore:
[OH!] = CM(MOH)
[OH!] = 0.015
pH of Strong Bases
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Example 1: What is the pH for a solution of 0.015 M NaOH?
This is a group I metal hydroxide, therefore:
[OH!] = CM(MOH)
[OH!] = 0.015
pOH = !log(0.015)
pH of Strong Bases
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Example 1: What is the pH for a solution of 0.015 M NaOH?
This is a group I metal hydroxide, therefore:
[OH!] = CM(MOH)
[OH!] = 0.015
pOH = !log(0.015)
pOH = 1.82
pH of Strong Bases
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Example 1: What is the pH for a solution of 0.015 M NaOH?
This is a group I metal hydroxide, therefore:
[OH!] = CM(MOH)
[OH!] = 0.015
pOH = !log(0.015)
pOH = 1.82
But: 14.00 = pH + pOH
pH of Strong Bases
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Example 1: What is the pH for a solution of 0.015 M NaOH?
This is a group I metal hydroxide, therefore:
[OH!] = CM(MOH)
[OH!] = 0.015
pOH = !log(0.015)
pOH = 1.82
But: 14.00 = pH + pOH
So: pH = 12.18
pH of Strong Bases
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Example 2: What is the pH for a solution of 0.015 MBa(OH)2?
pH of Strong Bases
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This is a group II metal hydroxide, therefore:
pH of Strong Bases
Example 2: What is the pH for a solution of 0.015 MBa(OH)2?
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[OH!] = 2CM(MOH)
pH of Strong Bases
This is a group II metal hydroxide, therefore:
Example 2: What is the pH for a solution of 0.015 MBa(OH)2?
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[OH!] = 2 0.015
pH of Strong Bases
[OH!] = 2CM(MOH)
This is a group II metal hydroxide, therefore:
Example 2: What is the pH for a solution of 0.015 MBa(OH)2?
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pOH = !log(0.030)
pH of Strong Bases
[OH!] = 2 0.015
[OH!] = 2CM(MOH)
This is a group II metal hydroxide, therefore:
Example 2: What is the pH for a solution of 0.015 MBa(OH)2?
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pOH = 1.52
pH of Strong Bases
pOH = !log(0.030)[OH!] = 2 0.015
[OH!] = 2CM(MOH)
This is a group II metal hydroxide, therefore:
Example 2: What is the pH for a solution of 0.015 MBa(OH)2?
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But: 14.00 = pH + pOH
pH of Strong Bases
pOH = 1.52pOH = !log(0.030)[OH!] = 2 0.015
[OH!] = 2CM(MOH)
This is a group II metal hydroxide, therefore:
Example 2: What is the pH for a solution of 0.015 MBa(OH)2?
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So: pH = 12.48
pH of Strong Bases
But: 14.00 = pH + pOHpOH = 1.52pOH = !log(0.030)[OH!] = 2 0.015
[OH!] = 2CM(MOH)
This is a group II metal hydroxide, therefore:
Example 2: What is the pH for a solution of 0.015 MBa(OH)2?
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pH of Strong BasesPART III
THE END
Go on to the slideshow on weak acids.