{"id":2361,"date":"2026-02-06T22:38:44","date_gmt":"2026-02-06T20:38:44","guid":{"rendered":"https:\/\/science-x.net\/?page_id=2361"},"modified":"2026-02-06T22:38:57","modified_gmt":"2026-02-06T20:38:57","slug":"ph-calculator","status":"publish","type":"page","link":"https:\/\/science-x.net\/?page_id=2361","title":{"rendered":"pH Calculator"},"content":{"rendered":"\n<div class=\"eco-tool wp-block-group\" id=\"eco-tool-ph-4d0a6\">\n  <div class=\"eco-tool__header\">\n    <h2 class=\"eco-tool__title\">pH Calculator<\/h2>\n    <p class=\"eco-tool__lead\">\n      Convert between pH and hydrogen ion concentration. Enter either pH or [H\u207a] and we\u2019ll calculate the other.\n    <\/p>\n  <\/div>\n\n  <form class=\"eco-tool__form\" id=\"eco-ph-form-4d0a6\" novalidate>\n    <div class=\"eco-tool__grid3\">\n      <!-- Mode -->\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-ph-mode-4d0a6\">\n          Calculation<br>mode\n        <\/label>\n        <select class=\"eco-tool__input\" id=\"eco-ph-mode-4d0a6\">\n          <option value=\"fromPh\" selected>pH \u2192 [H\u207a]<\/option>\n          <option value=\"toPh\">[H\u207a] \u2192 pH<\/option>\n        <\/select>\n        <div class=\"eco-tool__hint\">Choose what you want to calculate.<\/div>\n      <\/div>\n\n      <!-- pH input -->\n      <div class=\"eco-tool__field\" id=\"eco-ph-ph-wrap-4d0a6\">\n        <label class=\"eco-tool__label\" for=\"eco-ph-ph-4d0a6\">\n          pH<br>value\n        <\/label>\n        <input class=\"eco-tool__input\" id=\"eco-ph-ph-4d0a6\" type=\"number\" step=\"0.01\" value=\"7.00\" inputmode=\"decimal\" \/>\n        <div class=\"eco-tool__hint\">Typical pH range: 0\u201314 (can be outside in strong cases).<\/div>\n      <\/div>\n\n      <!-- H+ input -->\n      <div class=\"eco-tool__field\" id=\"eco-ph-h-wrap-4d0a6\" style=\"display:none;\">\n        <label class=\"eco-tool__label\" for=\"eco-ph-h-4d0a6\">\n          [H\u207a]<br>value\n        <\/label>\n        <input class=\"eco-tool__input\" id=\"eco-ph-h-4d0a6\" type=\"number\" step=\"any\" value=\"1e-7\" inputmode=\"decimal\" \/>\n        <div class=\"eco-tool__hint\">Must be a positive concentration.<\/div>\n      <\/div>\n\n      <!-- Units -->\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-ph-unit-4d0a6\">\n          Concentration<br>unit\n        <\/label>\n        <select class=\"eco-tool__input\" id=\"eco-ph-unit-4d0a6\">\n          <option value=\"mol\" selected>mol\/L<\/option>\n          <option value=\"umol\">\u00b5mol\/L<\/option>\n        <\/select>\n        <div class=\"eco-tool__hint\">We convert and show both forms.<\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"eco-tool__actions\">\n      <button type=\"button\" class=\"wp-element-button eco-tool__btn\" id=\"eco-ph-calc-4d0a6\">Calculate<\/button>\n      <button type=\"button\" class=\"wp-element-button eco-tool__btn eco-tool__btn--ghost\" id=\"eco-ph-reset-4d0a6\">Reset<\/button>\n      <div class=\"eco-tool__error\" id=\"eco-ph-error-4d0a6\" aria-live=\"polite\"><\/div>\n    <\/div>\n  <\/form>\n\n  <div class=\"eco-tool__result\" id=\"eco-ph-result-4d0a6\" hidden>\n    <h3 class=\"eco-tool__subtitle\">Result<\/h3>\n\n    <div class=\"eco-tool__cards\">\n      <div class=\"eco-tool__card\">\n        <div class=\"eco-tool__metric-label\">pH<\/div>\n        <div class=\"eco-tool__metric-value\" id=\"eco-ph-out-ph-4d0a6\">\u2014<\/div>\n        <div class=\"eco-tool__metric-sub\">pH = \u2212log\u2081\u2080([H\u207a])<\/div>\n      <\/div>\n\n      <div class=\"eco-tool__card\">\n        <div class=\"eco-tool__metric-label\">[H\u207a]<\/div>\n        <div class=\"eco-tool__metric-value\" id=\"eco-ph-out-h-4d0a6\">\u2014<\/div>\n        <div class=\"eco-tool__metric-sub\" id=\"eco-ph-out-hsub-4d0a6\">\u2014<\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"eco-tool__card eco-tool__card--wide\">\n      <div class=\"eco-tool__metric-label\">Interpretation<\/div>\n      <div class=\"eco-tool__metric-sub\" id=\"eco-ph-interpret-4d0a6\"><\/div>\n    <\/div>\n\n    <p class=\"eco-tool__note\">\n      Educational tool. Real chemistry depends on activity, temperature, and ionic strength.\n    <\/p>\n  <\/div>\n\n  <details class=\"eco-tool__details\">\n    <summary class=\"eco-tool__summary\">Formula<\/summary>\n    <div class=\"eco-tool__details-body\">\n      <p class=\"eco-tool__text\">\n        pH = \u2212log\u2081\u2080([H\u207a]) and [H\u207a] = 10<sup>\u2212pH<\/sup>.\n      <\/p>\n    <\/div>\n  <\/details>\n<\/div>\n\n<style>\n.eco-tool{\n  border: 1px solid rgba(0,0,0,.12);\n  border-radius: 12px;\n  padding: 16px;\n}\n.eco-tool__grid3{\n  display: grid;\n  grid-template-columns: 1fr;\n  gap: 16px;\n}\n@media (min-width: 860px){\n  .eco-tool__grid3{ grid-template-columns: 1fr 1fr 1fr; }\n}\n.eco-tool__field{ display:flex; flex-direction:column; gap:6px; }\n.eco-tool__label{ font-weight:600; }\n.eco-tool__input{\n  height:44px; padding:0 12px;\n  border:1px solid rgba(0,0,0,.2);\n  border-radius:10px; background:#fff; font:inherit; box-sizing:border-box;\n}\n.eco-tool select.eco-tool__input{ appearance:none; padding-right:40px; }\n.eco-tool__hint{ font-size:.92em; opacity:.78; min-height:38px; }\n\n.eco-tool__actions{\n  display:flex; gap:10px; margin-top:16px; align-items:center; flex-wrap:wrap;\n}\n.eco-tool__btn{ padding:10px 22px; }\n.eco-tool__btn--ghost{\n  background:transparent !important;\n  border:1px solid rgba(0,0,0,.2) !important;\n}\n.eco-tool__btn--ghost:hover,\n.eco-tool__btn--ghost:focus{\n  background:rgba(0,0,0,.06) !important;\n  border-color:rgba(0,0,0,.35) !important;\n}\n.eco-tool__error{ font-weight:600; min-height:1.2em; flex:1 1 240px; }\n\n.eco-tool__result{ margin-top:16px; }\n.eco-tool__subtitle{ margin:0 0 10px; }\n\n.eco-tool__cards{\n  display:grid; gap:10px; grid-template-columns:1fr;\n}\n@media (min-width: 860px){\n  .eco-tool__cards{ grid-template-columns: 1fr 1fr; }\n}\n.eco-tool__card{\n  border:1px solid rgba(0,0,0,.12);\n  border-radius:12px;\n  padding:12px;\n}\n.eco-tool__card--wide{ margin-top:10px; }\n\n.eco-tool__metric-label{ opacity:.85; font-weight:600; }\n.eco-tool__metric-value{ font-size:1.6em; font-weight:800; margin-top:6px; line-height:1.1; }\n.eco-tool__metric-sub{ opacity:.85; margin-top:6px; }\n.eco-tool__note{ margin-top:10px; opacity:.9; }\n\n.eco-tool__details{ margin-top:14px; }\n.eco-tool__summary{ cursor:pointer; font-weight:700; }\n.eco-tool__details-body{ margin-top:10px; }\n<\/style>\n\n<script>\n(function(){\n  const S=\"4d0a6\";\n  const el=id=>document.getElementById(id+\"-\"+S);\n\n  const modeEl=el(\"eco-ph-mode\");\n  const phWrap=el(\"eco-ph-ph-wrap\");\n  const hWrap=el(\"eco-ph-h-wrap\");\n  const phEl=el(\"eco-ph-ph\");\n  const hEl=el(\"eco-ph-h\");\n  const unitEl=el(\"eco-ph-unit\");\n\n  const calcBtn=el(\"eco-ph-calc\");\n  const resetBtn=el(\"eco-ph-reset\");\n  const errEl=el(\"eco-ph-error\");\n\n  const resEl=el(\"eco-ph-result\");\n  const outPh=el(\"eco-ph-out-ph\");\n  const outH=el(\"eco-ph-out-h\");\n  const outHsub=el(\"eco-ph-out-hsub\");\n  const interp=el(\"eco-ph-interpret\");\n\n  function setError(msg){ errEl.textContent = msg || \"\"; }\n  function showMode(){\n    const m = modeEl.value;\n    if (m === \"fromPh\"){\n      phWrap.style.display = \"\";\n      hWrap.style.display = \"none\";\n    } else {\n      phWrap.style.display = \"none\";\n      hWrap.style.display = \"\";\n    }\n  }\n\n  function fmtSci(x){\n    if (!Number.isFinite(x)) return \"\u2014\";\n    if (x === 0) return \"0\";\n    \/\/ show scientific for very small\/large\n    if (Math.abs(x) < 0.0001 || Math.abs(x) >= 10000) return x.toExponential(3);\n    return x.toLocaleString(undefined,{maximumFractionDigits:6});\n  }\n\n  function interpretPH(ph){\n    if (!Number.isFinite(ph)) return \"\";\n    if (ph < 3) return \"Very acidic.\";\n    if (ph < 7) return \"Acidic.\";\n    if (ph === 7) return \"Neutral (pure water at 25\u00b0C, idealized).\";\n    if (ph <= 11) return \"Basic (alkaline).\";\n    return \"Very basic.\";\n  }\n\n  function calculate(){\n    setError(\"\");\n\n    const mode = modeEl.value;\n    const unit = unitEl.value;\n\n    let ph = null;\n    let H = null; \/\/ mol\/L\n\n    if (mode === \"fromPh\"){\n      ph = Number(phEl.value);\n      if (!Number.isFinite(ph)){\n        setError(\"Please enter a valid pH value.\");\n        resEl.hidden = true;\n        return;\n      }\n      H = Math.pow(10, -ph); \/\/ mol\/L\n    } else {\n      let hIn = Number(hEl.value);\n      if (!Number.isFinite(hIn) || hIn <= 0){\n        setError(\"Please enter a positive [H\u207a] concentration.\");\n        resEl.hidden = true;\n        return;\n      }\n      \/\/ Convert input to mol\/L if user selected \u00b5mol\/L\n      if (unit === \"umol\") hIn = hIn * 1e-6;\n      H = hIn;\n      ph = -Math.log10(H);\n    }\n\n    \/\/ Output concentration in both units\n    const Hmol = H;\n    const Humol = H * 1e6;\n\n    outPh.textContent = ph.toLocaleString(undefined,{maximumFractionDigits:3});\n    outH.textContent = (unit === \"umol\")\n      ? `${fmtSci(Humol)} \u00b5mol\/L`\n      : `${fmtSci(Hmol)} mol\/L`;\n\n    outHsub.textContent = (unit === \"umol\")\n      ? `Also: ${fmtSci(Hmol)} mol\/L`\n      : `Also: ${fmtSci(Humol)} \u00b5mol\/L`;\n\n    interp.textContent = interpretPH(Math.round(ph*1000)\/1000);\n\n    resEl.hidden = false;\n  }\n\n  function reset(){\n    modeEl.value = \"fromPh\";\n    unitEl.value = \"mol\";\n    phEl.value = \"7.00\";\n    hEl.value = \"1e-7\";\n    setError(\"\");\n    showMode();\n    resEl.hidden = true;\n  }\n\n  \/\/ init\n  showMode();\n  modeEl.addEventListener(\"change\", showMode);\n  calcBtn.addEventListener(\"click\", calculate);\n  resetBtn.addEventListener(\"click\", reset);\n})();\n<\/script>\n\n","protected":false},"excerpt":{"rendered":"<p>pH Calculator Convert between pH and hydrogen ion concentration. Enter either pH or [H\u207a] and we\u2019ll calculate the other. Calculationmode pH \u2192 [H\u207a][H\u207a] \u2192 pH Choose what you want to&hellip;<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":2354,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","footnotes":""},"_links":{"self":[{"href":"https:\/\/science-x.net\/index.php?rest_route=\/wp\/v2\/pages\/2361"}],"collection":[{"href":"https:\/\/science-x.net\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/science-x.net\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/science-x.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/science-x.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2361"}],"version-history":[{"count":1,"href":"https:\/\/science-x.net\/index.php?rest_route=\/wp\/v2\/pages\/2361\/revisions"}],"predecessor-version":[{"id":2362,"href":"https:\/\/science-x.net\/index.php?rest_route=\/wp\/v2\/pages\/2361\/revisions\/2362"}],"up":[{"embeddable":true,"href":"https:\/\/science-x.net\/index.php?rest_route=\/wp\/v2\/pages\/2354"}],"wp:attachment":[{"href":"https:\/\/science-x.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2361"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}