What is the pH value of the plating solution?

The pH value of the bath is a relative value of the pH of the bath. Strictly speaking, it is the negative logarithmic value of the concentration of hydrogen ions in the solution . Why should we take the negative logarithmic value? This is because in the neutral , the degree of dissociation of water is very small, that is to say, the concentration of H ⁺ and HO ^- in the aqueous solution is very low, and their ion product K[H ₂ O] is only 10 ^{- 14} , [H ⁺ ] and [HO ^- are only 1.0X10 ^-7 mol/L respectively, so it is very inconvenient to use these values ​​to express the acidity and alkalinity of the solution. After being processed by mathematical methods , it is only necessary to use the value of the index of its concentration to express it in normal use. The numerical value is set as an indicator, called pH value. This is because the nature of acid is essentially the property of hydrogen ions . Therefore, the concentration of hydrogen ions in the solution also reflects the acidity of the solution . Since the negative logarithm value is the number of zeros contained in the number, the higher the value The higher the pH value, the lower the concentration of hydrogen ions . Therefore, the larger the pH value, the weaker the acidity, and vice versa, the stronger the acidity. In neutral water, the concentration of hydrogen ions that can be dissociated is exactly equal to the concentration of hydroxide ions and its negative logarithm value is equal to 7'. Therefore, pH=7 represents neutrality. Obviously, anything less than 7 is acidic, and anything greater than 7 is alkaline, and if you subdivide it further, it can be divided into weakly acidic and weakly alkaline.