PPT - Acids, Bases & Salts Class 7 Notes | EduRev

Science Class 7

Created by: Praveen Kumar

Class 7 : PPT - Acids, Bases & Salts Class 7 Notes | EduRev

 Page 1


CHAPTER - 5 
 
ACIDS, BASES AND SALTS 
Page 2


CHAPTER - 5 
 
ACIDS, BASES AND SALTS 
1) Tastes of some common edible substances :- 
     Edible substances have different tastes. Some have sour 
taste, some have bitter taste, some have sweet taste and 
some have salty taste. 
Sl.No. Substance Taste 
1 Lemon juice Sour 
2 Orange juice Sour/Sweet 
3 Vinegar Sour 
4 Curd Sour 
5 Tamarind Sour 
6 Sugar Sweet 
7 Common salt Salty 
8 Amla Sour 
9 Baking soda Bitter 
10 Grapes Sour/Sweet 
11 Unripe mango Sour 
12 Glucose Sweet 
Page 3


CHAPTER - 5 
 
ACIDS, BASES AND SALTS 
1) Tastes of some common edible substances :- 
     Edible substances have different tastes. Some have sour 
taste, some have bitter taste, some have sweet taste and 
some have salty taste. 
Sl.No. Substance Taste 
1 Lemon juice Sour 
2 Orange juice Sour/Sweet 
3 Vinegar Sour 
4 Curd Sour 
5 Tamarind Sour 
6 Sugar Sweet 
7 Common salt Salty 
8 Amla Sour 
9 Baking soda Bitter 
10 Grapes Sour/Sweet 
11 Unripe mango Sour 
12 Glucose Sweet 
2) Acids :- 
    Acids are substances which have sour taste. These 
substances are acidic in nature. 
Sl.No. Substance Name of acid 
1 Vinegar Acetic acid 
2 Ant’s sting Formic acid 
3 Citrus fruits like lemon, 
orange etc. 
Citric acid 
4 Curd Lactic acid 
5 Spinach Oxalic acid 
6 Amla  Ascorbic acid 
7 Tamarind, grapes, unripe 
mangoes etc. 
Tartaric acid 
Page 4


CHAPTER - 5 
 
ACIDS, BASES AND SALTS 
1) Tastes of some common edible substances :- 
     Edible substances have different tastes. Some have sour 
taste, some have bitter taste, some have sweet taste and 
some have salty taste. 
Sl.No. Substance Taste 
1 Lemon juice Sour 
2 Orange juice Sour/Sweet 
3 Vinegar Sour 
4 Curd Sour 
5 Tamarind Sour 
6 Sugar Sweet 
7 Common salt Salty 
8 Amla Sour 
9 Baking soda Bitter 
10 Grapes Sour/Sweet 
11 Unripe mango Sour 
12 Glucose Sweet 
2) Acids :- 
    Acids are substances which have sour taste. These 
substances are acidic in nature. 
Sl.No. Substance Name of acid 
1 Vinegar Acetic acid 
2 Ant’s sting Formic acid 
3 Citrus fruits like lemon, 
orange etc. 
Citric acid 
4 Curd Lactic acid 
5 Spinach Oxalic acid 
6 Amla  Ascorbic acid 
7 Tamarind, grapes, unripe 
mangoes etc. 
Tartaric acid 
3) Bases :- 
   Bases are substances which have bitter taste and have a 
soapy touch. These substances are basic in nature. 
Sl.No. Substance Name of base 
1 Lime water Calcium hydroxide 
2 Window cleaner Ammonium hydroxide 
3 Soap Sodium hydroxide 
Potassium hydroxide 
4 Milk of magnesia Magnesium hydroxide 
Page 5


CHAPTER - 5 
 
ACIDS, BASES AND SALTS 
1) Tastes of some common edible substances :- 
     Edible substances have different tastes. Some have sour 
taste, some have bitter taste, some have sweet taste and 
some have salty taste. 
Sl.No. Substance Taste 
1 Lemon juice Sour 
2 Orange juice Sour/Sweet 
3 Vinegar Sour 
4 Curd Sour 
5 Tamarind Sour 
6 Sugar Sweet 
7 Common salt Salty 
8 Amla Sour 
9 Baking soda Bitter 
10 Grapes Sour/Sweet 
11 Unripe mango Sour 
12 Glucose Sweet 
2) Acids :- 
    Acids are substances which have sour taste. These 
substances are acidic in nature. 
Sl.No. Substance Name of acid 
1 Vinegar Acetic acid 
2 Ant’s sting Formic acid 
3 Citrus fruits like lemon, 
orange etc. 
Citric acid 
4 Curd Lactic acid 
5 Spinach Oxalic acid 
6 Amla  Ascorbic acid 
7 Tamarind, grapes, unripe 
mangoes etc. 
Tartaric acid 
3) Bases :- 
   Bases are substances which have bitter taste and have a 
soapy touch. These substances are basic in nature. 
Sl.No. Substance Name of base 
1 Lime water Calcium hydroxide 
2 Window cleaner Ammonium hydroxide 
3 Soap Sodium hydroxide 
Potassium hydroxide 
4 Milk of magnesia Magnesium hydroxide 
4) Neutral substances :- 
    Substances which are neither acidic nor basic are  
called neutral substances. 
 Eg:- sugar solution, salt solution, distilled water etc. 
 
5) Indicators :- 
    Substances which change their colour in acidic and  
basic solutions are called indicators. 
    Eg :- Litmus, Turmeric, China rose petals are some  
naturally occuring indicators. 
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