What will happen to the pH fo a substance if the concentration of hydrogen ions increases from 1.0x10-8 to 1.0x106-6?
If the concentration of hydrogen ions increases from 1.0x10^-8 to 1.0x10^-6, the pH of the substance will decrease. This is because pH is the negative logarithm of hydrogen ion concentration, so an increase in hydrogen ion concentration leads to a decrease in pH.