"Henderson-Hasselbalch equation" meaning in English

{
  "etymology_text": "Named after Lawrence Joseph Henderson, who devised a related equation in 1908, and Karl Albert Hasselbalch, who re-expressed it in logarithmic terms.",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "An equation describing the derivation of pH as a measure of acidity (using pKa, the negative log of the acid dissociation constant) in biological and chemical systems."
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        [
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        [
          "acidity",
          "acidity"
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          "biological",
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          "chemical",
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      "raw_glosses": [
        "(chemistry) An equation describing the derivation of pH as a measure of acidity (using pKa, the negative log of the acid dissociation constant) in biological and chemical systems."
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ],
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        "Henderson-Hasselbalch equation"
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  "word": "Henderson-Hasselbalch equation"
}

{
  "etymology_text": "Named after Lawrence Joseph Henderson, who devised a related equation in 1908, and Karl Albert Hasselbalch, who re-expressed it in logarithmic terms.",
  "forms": [
    {
      "form": "Henderson-Hasselbalch equations",
      "tags": [
        "plural"
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        "An equation describing the derivation of pH as a measure of acidity (using pKa, the negative log of the acid dissociation constant) in biological and chemical systems."
      ],
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        "(chemistry) An equation describing the derivation of pH as a measure of acidity (using pKa, the negative log of the acid dissociation constant) in biological and chemical systems."
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
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}