PH OF DIFFERENT SUBSTANCES:
   Apple : 2.9-3.3
   pure water : 7
   butter : 6.1-6.4
   milk : 6.3-6.6
   wheat flour : 5.5-6.5
   cola : 3
   dates : 6.2-6.4
   tomato juice : 4.
STRONG ACID
 
   An acid which ionize in aqueous solution to large extent is called "strong acid".
   Example: HCl, H2SO4, HNO3
WEAK ACID
STRONG ACID - WEAK ACID - TYPES OF SALT - ACIDIC SALT - BASIC SALT - NEUTRAL SALT - TITRATION
   An acid which ionizes in aqueous solution to smaller extent, is called "weak acid".
   Example: CH3COOH, oxalic acid (COOH-COOH), formic acid (HCOOH).
HYDROLYSIS
 
   Reaction of a substance with water in which pH of water is changed is called "Hydrolysis". In hydrolysis bond    between H and O in water are broken down. Hydrolysis is reverse reaction of neutralization.
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NH4Cl + H2O NH4OH + HCl
TYPES OF SALT
 
   There are three types of salts
   (1) Acidic salt.
   (2) Basic salt.
   (3) Neutral salt.
ACIDIC SALT
STRONG ACID - WEAK ACID - TYPES OF SALT - ACIDIC SALT - BASIC SALT - NEUTRAL SALT - TITRATION
   Salt formed by the reaction between strong acid and weak base is called "Acidic salt"
.  Example: NH4Cl, CuSO4
weak base + strong acid acidic salt + water
NH4OH + HCl NH4Cl + H2O
BASIC SALT
 
   Salt formed by the reaction between strong base and weak acid is called " basic salt".
.  Example: CH3COONa, Na2S
strong base + weak acid basic salt + water
2NaOH + H2CO3 Na2CO3 + 2H2O
NEUTRAL SALT
 
   Salt formed by the reaction between strong acid and strong base is called "neutral salt".
   Example: NaCl, KNO3
strong base +strong acid neutral salt + water
NaOH + HCl NaCl + H2O
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