![]() The pH scale is logarithmic and therefore pH is a dimensionless quantity. Commercial standard buffer solutions usually come with information on the value at 25 ☌ and a correction factor to be applied for other temperatures. HIPAA is the acronym for the Health Insurance Portability and Accountability Act of 1996, and the term is also frequently used to mean the many regulations. ![]() When more than two buffer solutions are used the electrode is calibrated by fitting observed pH values to a straight line with respect to standard buffer values. Further details, are given in the IUPAC recommendations. The reading from a second standard buffer solution is then adjusted using the "slope" control to be equal to the pH for that solution. To calibrate the electrode, it is first immersed in a standard solution, and the reading on a pH meter is adjusted to be equal to the standard buffer's value. Two or more buffer solutions are used in order to accommodate the fact that the "slope" may differ slightly from ideal. It is calibrated against buffer solutions of known hydrogen ion ( H +) activity proposed by the International Union of Pure and Applied Chemistry ( IUPAC). A combined glass electrode has an in-built reference electrode. In practice, a glass electrode is used instead of the cumbersome hydrogen electrode. ![]() pH = − log ( a H + ) ≈ − log ( ), the "Nernstian slope". The pH scale is logarithmic and inversely indicates the activity of hydrogen ions in the solution. PHI exists in the context of HIPAA, whereas PII is not necessarily. Personally Identifiable Information (PII), by contrast, is a general term and covers any data that can be used to identify an individual. Acidic solutions (solutions with higher concentrations of hydrogen ( H +) ions) are measured to have lower pH values than basic or alkaline solutions. PHI stands for Protected Health Information and is any data that was degenerated, used, or disclosed during a patient’s medical care. It is a scale used to specify the acidity or basicity of an aqueous solution. In chemistry, pH ( / p iː ˈ eɪ tʃ/ pee- AYCH), also referred to as acidity, historically denotes "potential of hydrogen" (or "power of hydrogen").
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