Hydrogen Ions and Acidity Section 192 To test a diagnosis of diabetic coma a doctor orders several tests including the acidity of the patients blood Results from this test will be expressed in units of ID: 159962
Download Presentation The PPT/PDF document "Indicators and" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
Indicators andHydrogen Ions and Acidity
Section 19.2Slide2
To test a diagnosis of diabetic coma, a doctor orders several tests, including the acidity of the patient’s blood. Results from this test will be expressed in units of
pH.
You will learn how the pH scale is used to indicate the acidity of a solution and why the pH scale is used.Slide3
Hydrogen Ions from Water
The reaction in which water molecules produce ions is called the
self-ionization
of water.Slide4
In aqueous solutions:(Something dissolved in water)
The concentration of H
+ and the concentration of OH- multiplied together will equal
1.0
10-14.
Concentration of H
+
= [H+]Concentration of OH- = [OH-] Slide5
Neutral, Acidic, or Basic?
When [H
+] and [OH
-
] are equal, it is described as a neutral solution.An acidic solution
is one in which [H
+
] is greater than [OH-].A basic solution is one in which [H+] is less than [OH].[H+] > 1.0 x 10-7 = acidic[H+
] < 1.0 x 10-7 = basicSlide6
Calculation 1: Using H+ or OH-
to find concentrationsSlide7
Where does pH come into play?
Use your hydrogen ion concentration to calculate the pH of your substance.Slide8
Relating pH to [H+]
A solution in which [H
+] is greater than 1 10–7 M
has a pH less than 7.0 and is acidic
.The pH of pure water or a neutral aqueous solution is 7.0.A solution with a pH greater than 7 is basic and has a [H+] of less than 1 10–7 M.Slide9Slide10
Calculation 2: Calculate pH from [H+]:Slide11
Calculation 3: Using pH to find [H+]: Slide12
Calculation 4: Calculating pH from [OH-]: Slide13
Acid-Base Indicators: An indicator is a valuable tool for measuring pH because its acid form and base form have different colors in solution.Slide14
Acid-Base Indicators: 1) Universal Indicators: Slide15
Acid-Base Indicators: 2) pH Meters:Slide16
Acid-Base Indicators:
3) Phenolphthalein
changes from colorless to pink at pH 7–9.
This indicator is used for
TITRATIONS. Slide17
AssignmentComplete Lab
Use pH values to calculate the [H
+] of each substance. Turn in when completed.