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Battery acid
0-1
Gastric juice
1.0
Stomach acid
2.0
Lemon juice
2.4
Orange juice
3.5
Wine, tomato, banana
4.0
Black coffee
5.0
Rain water
6.0
Sea water
8.0
Baking soda
9.0
Toilet soap
10
Household ammonia
11.5
Household bleach
13
Drain cleaner
14
