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Self-Assembly of Collagen in Different pH Values. The pH value of the phosphate buffer was adjusted to 5.7, 7.0, 8.0, and 9.2 with 0.1 M NaOH, and the original collagen solution (4 mg/ml, pH = 7.0) was dissolved in phosphate buffer with the different pH values to make the final concentration at 0.2 mg/ml of all the samples [15, 16].


Definition of pH scale: A measure of acidity or alkalinity of water soluble substances (pH stands for 'potential of Hydrogen'). A pH value is a number from 1 to 14, with 7 as the middle (neutral) point.


The neutral value of the pH depends on the temperature, being lower than 7 if the temperature increases. The pH value can be less than 0 for very strong acids, or greater than 14 for very strong bases. The pH scale is traceable to a set of standard solutions whose pH is established by international agreement.


The pH scale is a logarithmic scale that usually runs from 1 to 14. Each whole pH value below 7 (the pH of pure water) is ten times more acidic than the higher value and each whole pH value above 7 is ten times less acidic than the one below it.


Rough pH measurements can be made using litmus paper or another type of pH paper known to change colors around a certain pH value. Most indicators and pH papers are useful only to tell whether a substance is an acid or a base or to identify pH within a narrow range.


A pH Value is a whole number in the range of 1 to 14 which describes the measure of alkalinity or acidity of water soluble substances. If the pH level of any water soluble substance is 7, it is neutral and not considered as an acidic or alkaline substance.


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.


pH is a measure of how acidic/basic water is. The range goes from 0 to 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.


But, this equation in most cases provides the same value as the more common formula, so in introductory chemistry the previous equation is given as the definition of pH. Most substances have a pH in the range of 0 to 14, although extremely acidic or alkaline substances may have pH < 0, or pH > 14.


You may have heard the word “pH” used to describe drinking water quality, but do you know what it means? pH is a measurement of electrically charged particles in a substance.