it is the concentration of hydronium ions in solution. it is 10^-(pH number). SO IF PH IS 4 THEN THE AMOUNT OF HYDRONIUM IONS IS 10^-4. Acids have more hydronium ions and bases have less.
Ph is the measure of the acidity or alkalinity of a solution, numerically equal to 7 for neutral solutions, increasing with increasing alkalinity and decreasing with increasing acidity. The pH scale commonly in use ranges from 0 to 14. Hope this helps.
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