In this article I’ll explain how the pH of hair products can affect your hair’s condition and how you can avoid unnecessary damage. The structure of the hair is made of two main parts. The outer layer, called the cuticle consists of overlapping scales which protect the cortex underneath.
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Acetic acid with a molar concentration of 0.9 or approximately 1.0 M has a pH value of about 2.4, which is also the pH of vinegar that contains about 5 percent acetic acid. Acetic acid with a molar concentration of 0.1 M has a pH of 2.87, and 0.0001 M of acetic acid has a pH of 4.3.
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You can measure the pH of anything that is water soluable. The pH indicates how acid or alkaline a substance is. The scale ranges from 0 to 14 with 0 being a very strong acid and 14 being a very strong alkali (aka a base).
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The acidity or alkalinity of a substance is measured using the pH scale. A high pH represents a substance which is alkaline and a low pH represents a substance that is acidic. In order to test the pH of a substance special paper is used that changes color when reacting with the material.
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pH of Bleach. The main ingredient in household bleach is sodium hypochlorite. This is usually diluted with water to a concentration of approximately 5 percent. The pH of this solution is approximately 11. This means that it is very alkaline and pH paper will turn dark blue/purple when it makes contact with household bleach.
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Since peroxide has a pH of 7 all the alkalinity comes from the powder. If in doubt mix your bleach to a thinner consistancy with more peroxide and avoid lumps of powder which can cause breakage. If you use a lot of powder the bleach is going to have a high pH which causing damage to the hair.
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Bleach has a pH value of around 12 or 13. The pH scale is used as a measure of the acidity or basicity of solutions in which the solvent is water. Solutions with a pH value of 7 or less are acidic, while those above this number are basic. Continue Reading.
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Pure water has a pH value of 7. Substances with lower, or more acidic values, include lemons (2.2), wine and beer (4.0) and battery acid (1.0). Substances with higher, or more basic, pH values include bleach, as well as ammonia (11.0) and human blood (7.4).
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Most permanent hair colours are alkaline. When an alkaline substance is applied to hair it opens up the cuticle. With hair colour this allows the mixture to penetrate to the cortex where it can react with the hair’s pigment molecules to produce a colour change. Permanent colours have a pH of around 7-8. With bleach the colour molecules are oxidised, producing the lightening effect. Bleach usually has a pH of around 8 or 9 and if used too often or mixed too strong it will cause the scales in the cuticle layer to break off which causes permanent damage.
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What is pH. pH is a measure of the hydorgen ion concentration of a solution. Solutions with a high concentration of hydrogen ions have a low pH and solutions with a low concentrations of H+ ions have a high pH. This may seem like a confusion way to express these reationships, and it is, until you understand what pH stands for. The equation that defines pH is given as follows:
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what is ph of bleach
The pH of bleach is around 12 or 13.