5. Acids, Bases and Salts MAHARASHTRA BOARD SCIENCE STD:9TH

1. BY…
SHARIYAM ALI

2.  SOLUTE:Subtance to be dissolved
 SOLVENT:Subtance into which dissolved
 SOLUTION: Dissolved solute in a solvent
 CONCENTRATION: The proportion of a solute in a
solution is called the concentration of the solute in
that solution
Solution
HIGH
CONCENTRATED
LOW
DILUTE SOLUTION

3. UNITS TO EXPRESS CONCENTRATION
1) Gram per litre ,g/L
2) Moles per litre M( molarity ) [NaCL]=1 molarity of
Nacl Solution is 1 M

4. PH OF SOLUTION
 Acids & Bases dissociate in water forming H+ & OH-
 These H+ & OH- ions are found in all natural aq.
Solution
Eg:Soil,blood,cell sap, fermentation etc
 In common aq.solutions, the range of h+ ions
concentration is very wide from 10 to 10^-4 to 10 ^ -14
mol/L

5. • In 1909, Danish Scientist Sorenson introduced the pH
scale(Power of Hydrogen)
• The pH scale extends from 0 to 14
• pH of pure water is 7 (neutral)
• pH of acidic solution (less than 7)
• pH of basic solution (more than 7)

6. Methods of pH determination
1) Conductivity meters
2) pH meter
3) Universal Indicator : Phenolphthalein
Bromothymol Blue