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Example

Calculate the pH value of 1) 0.1m HCl 2) solution obtained by mixing 5 gms of conc. HCl to get 1 liter volume.

1) \ pH = - log10 [ H+ ]

= - log10 [0.1]

= - log10 (1 ´ 10- 1 ) = +1

2) Molar concentration = 5

36.46 g/mole

= 0.137 molar

\ pH = - log10 [ H+ ]

= - log10 (0.137)

= - log10 (1.37 ´ 10- 1 ) = 0.86


pH indicators

An indicator is a chemical which indicates the nature of the solution, by means of a sharp change in color.

Universal indicator

Acid-base indicator

  • Is a mixture of organic dyes
  • Indicates strength of solution
  • Change in color is sharp at any pH
  • is a chemical such as Methyl orange, phenolphthalein
  • Does not indicate strength of solution
  • change in its color is abrupt at a particular pH

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Index

12.1 - Lowry and Bronsted Concept
12.2 - Conjugate Acid Base Pairs
12.3 - Amphoteric Substance
12.4 - Lewis Acids and Bases
12.5 - Strong and Weak Acids and Bases
12.6 - Dissociation
12.7 - Ostwald's Dilution Law
12.8 - Hydrogen Ion Concentration : pH
12.9 - Polyprotic Acids
12.10 - Salts
12.11 - Methods of Preparation of Salts
12.12 - Properties of Salts

Chapter 13





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