Section 410IAC7-24-61. "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 7-24-61; filed Oct 13, 2004, 12:30 p.m.: 28 IR 828; readopted filed Jul 15, 2010, 12:12 p.m.: 20100728-IR-410100261RFA; readopted filed Nov 10, 2016, 8:45 a.m.: 20161207-IR-410160371RFA)

                    
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