List of pH Value of Different Substances:



 

List of pH Value 

pH is really a measure of the relative amount of hydrogen and hydroxyl in a water solution. Water that has more free hydrogen ions is acidic, whereas water that has more hydroxyl ions is basic. pH is measured on a scale of 0–14. On the pH scale, zero indicates extreme acidity, 14 indicates extreme alkalinity and 7 indicates a neutral state. At 25° C the pH of pure water is very close to 7. Acids have a pH less than 7 while bases have a pH greater than 7.
pH stands for potential hydrogen with the “p” meaning potential and the “H” standing for hydrogen. The pH scale is a scale that is used to rank the relative basicity or acidity of substances to other substances, based on the amount of hydrogen ion activity in a substance.

  

SubstancepH Value
Battery acid1.0
Limes1.8-2.0
Lemon juice2.2-2.4
Fruit jellies2.8-3.4
Vinegar2.9
Apple juice2.9-3.3
Strawberries3.0-3.5
Orange juice3.7
Tomatoes4.0-4.5
Bear4.5
Coffee5.0
Tea5.5
Rainwater5.6-6.0
Peas5.8-6.4
Urine6.0
Corn6.0-6.5
Butter6.1-6.4
Cow’s milk6.4
Maple syrup6.5-7.0
Human saliva6.5-7.5

Water7.0
Human blood7.3-7.5
Seawater7.5-8.5
Egg whites7.6-8.0
Baking soda8.3
Borax9.2
Milk of magnesia10.5
Laundry ammonia11.0
Lime water12.0

Why pH is not more than 14?

As you all know, we measure the pH of all of the samples in water. And the reaction of water is
H+ + OH- ——> H20
In this equilibration constant kw is
[H+] [OH-] = Kw = 1 X 10^-14
By applying -log on both sides
-log [OH-] – log [H+] = 14
You know pH= – log [H+]
Therefore, pH = 14 – (-log [OH-])

You can see from this equation that the higher than a concentration of OH- ions, the lower the value of -log [OH-]. If the concentration of OH- ions reaches 1 mol/dm3, the value of -log [OH-] is zero, which, according to the equation, gives pH=14.0.
However, if the concentration of OH- ions exceeds 1 mol/dm3 (which is very rare), the value of -log [OH-] would be negative, which, according to the equation, gives a pH of greater than 14.0.

Therefore, the pH range does not necessarily have a maximum of 14.0, since there is no limit to the concentration of a base.

9.9pH, Lime - 8.2pH, Avocado - 15.6pH, Garlic - 13.2pH, Mango - 8.7pH, Tangerine - 8.5pH, Pineapple - 12.7pH and Orange - 9.2pH

                            

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