{"product_id":"buffer-standard-clear-ph-7-ph-9","title":"Buffer Standard pH 7, Clear, 500 mL","description":"\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat it is.\u003c\/strong\u003e This pH 7 buffer standard is a clear, colorless reference solution for calibrating pH meters and electrodes at neutral pH. It is supplied in a 500 mL size.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhy pH 7 comes first.\u003c\/strong\u003e A pH electrode produces nearly 0 mV at pH 7, so this buffer sets the meter's zero point, or offset. Nearly every calibration routine starts here, then adds pH 4, pH 10, or both to set the slope.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHow a buffer holds its pH.\u003c\/strong\u003e A buffer contains a weak acid and its conjugate base, or a weak base and its conjugate acid, in balanced amounts. When small amounts of acid or base enter the solution, one partner neutralizes them, so the pH barely moves. That resistance to change is what makes a buffer a reliable reference point for calibration, unlike plain water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhy choose a clear buffer.\u003c\/strong\u003e Clear buffers contain no dye, unlike color-coded yellow pH 7 buffers. That avoids dye residues on electrodes, labware, and sample cups, makes contamination or cloudiness easy to see, and suits labs that prefer dye-free standards for sensitive or colorimetric work. Labeling, rather than color, identifies the buffer, so keep containers clearly marked.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize for routine use.\u003c\/strong\u003e The 500 mL size suits benches that calibrate several times a week and want fresh stock without large volumes sitting open. For higher volumes, Lab Pro also offers color-coded Buffer Solution pH 7, Yellow in a 1-gallon size.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature matters.\u003c\/strong\u003e Buffer pH shifts slightly with temperature, so the stated value applies at 25 °C. Calibrate at the same temperature as your samples, use automatic temperature compensation if your meter has it, and apply temperature-correction values supplied with the buffer when they are provided.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalibration best practice.\u003c\/strong\u003e Rinse the electrode with deionized water and blot it gently between buffers, immerse it in a fresh portion of buffer in a clean beaker, stir gently, and wait for a stable reading before accepting each point. Calibrate before each day's measurements, or more often as the method requires, and record the meter-reported slope to track electrode health.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhere it is used.\u003c\/strong\u003e Use clear pH 7 buffer for calibration and daily verification in water and wastewater labs, environmental testing, pharmaceutical and biotech QC, food and beverage labs, and teaching labs. It pairs with Lab Pro's Buffer Standard, Clear, pH 7 \/ pH 9 and other buffers for two- or three-point calibration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse; border:1px solid #cfcfcf; margin-bottom:28px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003epH 7 buffer standard, clear\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eNominal pH\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003e7 at 25 °C\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eClear (colorless)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eUse\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003epH meter zero-point (offset) calibration\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003ePhysical State\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eLiquid, aqueous solution\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eReference Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003e25 °C\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eCalibration Role\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eZero point (offset)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eRecommended Pairing\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003epH 4, pH 9, or pH 10\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eOdor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eOdorless (typical for aqueous pH buffers)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eSpecific Gravity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eApprox. 1.0 (typical for aqueous pH buffers)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eMelting \/ Boiling Point\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eApprox. 0 °C \/ 100 °C (aqueous)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eStorage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eRoom temperature, tightly closed, protected from light and freezing\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eOpen-Container Stability\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eAcidic\/neutral: low CO2 sensitivity; protect from contamination\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003ePackage Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003e500 mL\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch4\u003eApplications \/ Common Uses\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eZero-point calibration:\u003c\/strong\u003e Sets the meter offset at the start of each calibration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDaily meter verification:\u003c\/strong\u003e Confirms the meter reads correctly before sample runs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDye-free workflows:\u003c\/strong\u003e Avoids dye residues on electrodes and labware.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo- and three-point calibration:\u003c\/strong\u003e Pairs with other buffers to set electrode slope.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrode troubleshooting:\u003c\/strong\u003e Reveals offset drift from fouled or aging electrodes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStorage, Handling \u0026amp; Shipping\u003c\/h4\u003e\n\u003cp\u003eStore the buffer tightly closed at room temperature, protected from light and freezing. Because it has no color code, keep the label intact and legible, pour portions into a clean beaker for each calibration, and discard used buffer.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStorage temperature:\u003c\/strong\u003e Store at room temperature and protect from light and freezing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContamination control:\u003c\/strong\u003e Pour the amount needed into a clean beaker; never return used buffer to stock or dip an electrode into the stock container.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShelf life:\u003c\/strong\u003e Use before the expiration date on the label; once opened, use within the period stated on the certificate or label.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRinsing:\u003c\/strong\u003e Rinse electrodes with deionized water between buffers to prevent carryover.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIdentification:\u003c\/strong\u003e Keep the original label legible; clear buffers cannot be identified by color.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eRelated Categories \u0026amp; Services\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eShop \u003ca href=\"https:\/\/labproinc.com\/collections\/ph-buffers-test-kits\" target=\"_blank\" rel=\"noopener noreferrer\"\u003ePH Buffers \u0026amp; Test Kits\u003c\/a\u003e for related products in this category.\u003c\/li\u003e\n\u003cli\u003eExplore \u003ca href=\"https:\/\/labproinc.com\/collections\/ph-buffers\" target=\"_blank\" rel=\"noopener noreferrer\"\u003epH Buffers\u003c\/a\u003e and \u003ca href=\"https:\/\/labproinc.com\/pages\/buffers-standards-solutions\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eBuffers, Standards \u0026amp; Solutions\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/labproinc.com\/pages\/be-a-lab-pro-vmi-program\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eVendor Managed Inventory (VMI) Program\u003c\/a\u003e: Lab Pro can stock, track, and replenish this item on site so it never runs out. Contact info@labproinc.com or 888-452-2776 to set up a VMI assessment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eRelated Articles\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/labproinc.com\/blogs\/chemicals-and-solvents\/which-ph-buffer-solution-should-i-use\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eWhich pH Buffer Solution Should I Use When Calibrating?\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/labproinc.com\/blogs\/lab-equipment-calibration\/the-role-of-calibration-in-quality-control-maintaining-consistency-and-compliance\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eThe Role of Calibration in Quality Control: Maintaining Consistency and Compliance\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/labproinc.com\/blogs\/chemicals-and-solvents\/what-is-the-proper-deionized-water-conductivity-range\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eWhat Is The Proper Deionized Water Conductivity Range?\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lab Pro Inc","offers":[{"title":"Default Title","offer_id":67674936737941,"sku":"LP-BC2007-5","price":26.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/2327\/6437\/files\/MainImage_aef6f8de-9652-4245-a2c3-c8e3faa8e395.png?v=1791876322","url":"https:\/\/labproinc2.myshopify.com\/products\/buffer-standard-clear-ph-7-ph-9","provider":"Lab Pro Inc Plus","version":"1.0","type":"link"}