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Indicators and Indicators and

Indicators and - PowerPoint Presentation

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Uploaded On 2015-10-14

Indicators and - PPT Presentation

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

indicators solution acid concentration solution indicators concentration acid base water calculation basic acidic greater ions acidity neutral calculate hydrogen

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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.Slide9
Slide10

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.