Question

Fresh milk has pH of 6. When milk changes into curd, the pH value will:
1. become 7
2. become less than 6
3. become more than 7
4. remain unchanged

Answer 1

Correct Answer - Option 2 : become less than 6

The correct answer becomes less than 6.

• The pH value of
  • The basic solution is greater than 7.
  • The neutral solution is equal to 7.
  • The acidic solution is less than 7.
• The pH value of milk is 6 since it is acidic in nature.
  • When the milk is converted into curd due to the action of bacteria, lactic acid is formed which is more acidic in nature. Therefore the pH value of the milk is reduced as it turns to curd.

Substance	pH Values
Pure water	7
Human blood	7.35-7.45
Seawater	7.45-8.4
Ammonia	10.6-11.6
Milk	6.5-6.7
Normal rain	5.6-6
Acid rain	2 to 5.6
Human urine	6
Black coffee	5
Beers	4.5
Wines	2.8-3.8
Vinegar	2.9
Lemon juice	2.4