The pH of Common Chemicals

pH is a measure of how acidic or basic a chemical is when it’s in aqueous (water) solution. A neutral pH value (neither an acid nor a base) is 7. Substances with a pH greater than 7 up to 14 are considered bases. Chemicals with a pH lower than 7 down to 0 are considered acids. The closer the pH is to 0 or 14, the greater its acidity or basicity, respectively

pH of Common Acids

Fruits and vegetables tend to be acidic. Citrus fruit, in particular, is acidic to the point where it can erode tooth enamel. Milk is often considered to be neutral, since it’s only slightly acidic. Milk becomes more acidic over time. The pH of urine and saliva is slightly acidic, around a pH of 6. Human skin, hair, and nails tends to have a pH around 5.

Substance pH Type
Hydrochloric Acid (HCl) 0.0 Acid
Battery Acid (H2SO4 sulfuric acid) 1.0 Acid
Gastric juice 1.2 Acid
lemon juice 2.2 Acid
Vinegar 2.8 Acid
Apples 3.0 Acid
Soft drinks 3.0 Acid
Wine and Beer 4.0 Acid
Tomatoes 4.5 Acid
Black coffee 5.0 Acid
Human saliva 6.4 Acid
Rain water 6.5 Acid
Milk 6.8 Acid

Neutral pH Chemicals

Distilled water tends to be slightly acidic because of dissolved carbon dioxide and other gases. Pure water is nearly neutral, but rain water tends to be slightly acidic. Natural water rich in minerals tends to be alkaline or basic.

7.0 – Pure Water

pH of Common Bases

Many common cleaners are basic. Usually, these chemicals have very high pH. Blood is close to neutral, but is slightly basic.


Human Blood 7.4 Base
Tears 7.4 Base
Egg 7.8 Base
Baking Soda (Sodium Bicarbonate) 8.3 Base
Milk of Magnesia 10.5 Base
Ammonia 11.0 Base
Lime (Calcium Hydroxide) 12.4 Base
Sodium Hydroxide (NaOH) 14.0 Base
Oven cleaner 13.8 Base

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