Section 410IAC7-21-23. "pH" defined

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"pH" means the symbol for the negative logarithm of the hydrogen ion concentration, which is a measure of the degree of acidity or alkalinity of a solution. Values between zero (0) and seven (7) indicate acidity, and values between seven (7) and fourteen (14) indicate alkalinity. The value for pure distilled water is seven (7), which is considered neutral. (Indiana State Department of Health; 410 IAC 7-21-23; filed Jan 7, 2002, 10:16 a.m.: 25 IR 1617, eff one hundred twenty (120) days after filing with secretary of state; readopted filed Jul 14, 2008, 2:14 p.m.: 20080806-IR-410080322RFA; readopted filed Sep 10, 2014, 2:08 p.m.: 20141008-IR-410140299RFA)

                    
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