What is an Indicator?

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Published on March 1, 2014

Author: littlevagabond

Source: slideshare.net

Description

What is a pH indicator, how does it work and what is it used for

Learning Goals: To understand how a pH indicator works To know a variety of pH indicators

Hydrochloric Acid H+ H+ Cl Cl Cl H+  All acids contain (H+) in solution.  pH is a fancy measure of the number of H+ ions in solution (but backward)  What will sort of number will an acid with lots of H+ give us?

Sulphuric Acid SO4 H+  All acids contain (H+) in solution. H+ H+ H+ SO4 H+ SO4 H+  Is the pH of this acid higher than HCl?  More H+ ions means a stronger acid?

Hydrochloric Acid H+ H+ Cl Cl Cl H+  Indicators detect H+ ions  H+ ions change the shape of the indicator molecule  A different shaped molecule means a different colour

DILUTE Cl H+ H+ Cl Has the number of H+ ions changed? Has the pH changed? Cl H+

CONCENTRATED Has the number of H+ ions changed Has the pH changed? Cl H+ Cl H+ H+ Cl

Red in acid Litmus Blue in alkali Phenolphthalein Colourless in acid Pink/Red in alkali

Bromothymol Blue Yellow in acid Blue in alkali Red in acid Methyl Orange Orange in alkali

Explain what the following litmus test tells you about the solution in the test tube alkali ?

What does the following litmus test tells you about the solution in the test tube acid ?

Explain what the following litmus test tells you about the solution in the test tube acid ?

What does the following litmus test tells you about the solution in the test tube alkali ?

Textbook: Read p220 P222 Q6

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