ChemicalBook >> CAS DataBase List >>Potassium hydrogen phthalate
Potassium hydrogen phthalate
- CAS No.
- 877-24-7
- Chemical Name:
- Potassium hydrogen phthalate
- Synonyms
- BUFFER;Potassium biphthalate;BUFFER SOLUTION;Potassium acid phthalate;Potassium hydrogen;KAP;Tablet;PHOSPHATE BUFF, PH 7.5;Potassium hydrogen phthalate standard solution;Potassium hydrogen phthalate, acidimetric standard
- CBNumber:
- CB1132397
- Molecular Formula:
- C8H5KO4
- Molecular Weight:
- 204.22
- MDL Number:
- MFCD00146206
- MOL File:
- 877-24-7.mol
- MSDS File:
- SDS
- TDS File:
- TDS
Last updated:2026-08-12 08:01:43
| Melting point | 295-300 °C (dec.) (lit.) |
|---|---|
| Boiling point | 98.5-99.5 ;°C/740 ;mmHg(lit .) |
| Density | 1.006 g/mL at 20 °C |
| bulk density | 900kg/m3 |
| storage temp. | Store at +5°C to +30°C. |
| solubility | H2O: 100 mg/mL, clear, colorless |
| form | Solid |
| color | White |
| Odor | Odorless |
| PH Range | 3.8 - 4.0 (5% aq. sol.) |
| PH | 4.00-4.02 (25.0℃±0.2℃, 0.05M) |
| Water Solubility | 80 G/L (20 ºC) |
| Merck | 14,7612 |
| BRN | 3637128 |
| Stability | Stable. Incompatible with strong oxidizing agents. |
| Cosmetics Ingredients Functions | BUFFERING |
| InChI | 1S/C8H6O4.K/c9-7(10)5-3-1-2-4-6(5)8(11)12;/h1-4H,(H,9,10)(H,11,12);/q;+1/p-1 |
| InChIKey | IWZKICVEHNUQTL-UHFFFAOYSA-M |
| SMILES | [K+].OC(=O)c1ccccc1C([O-])=O |
| LogP | -2.73 |
| CAS DataBase Reference | 877-24-7(CAS DataBase Reference) |
| EWG's Food Scores | 1 |
| FDA UNII | GG9121M623 |
| EPA Substance Registry System | Monopotassium phthalate (877-24-7) |
| Absorption | cut-off at 309nm in H2O at 0.1M |
| UNSPSC Code | 41116121 |
| NACRES | ND.02 |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |  GHS07 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Signal word | Warning | |||||||||
| Hazard statements | H315-H319 | |||||||||
| Precautionary statements | P264-P280-P302+P352-P337+P313-P305+P351+P338-P362+P364-P332+P313 | |||||||||
| Hazard Codes | Xi,C,T | |||||||||
| Risk Statements | 36/38-36/37/38-34-61-60 | |||||||||
| Safety Statements | 26-36-24/25-22-45-36/37/39-53 | |||||||||
| RIDADR | UN 1789 8/PG 3 | |||||||||
| WGK Germany | 1 | |||||||||
| RTECS | CZ4326000 | |||||||||
| F | 34 | |||||||||
| TSCA | TSCA listed | |||||||||
| HS Code | 29173990 | |||||||||
| Storage Class | 13 - Non Combustible Solids | |||||||||
| Toxicity | LD50 orally in Rabbit: > 3200 mg/kg | |||||||||
| REACH Registrations | Active | |||||||||
| NFPA 704 |
|
Potassium hydrogen phthalate price More Price(198)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| Sigma-Aldrich | PX1476 | Potassium Hydrogen Phthalate Meets ACS Specifications GR ACS | 877-24-7 | 500G | $192 | 2026-04-30 | Buy |
| Sigma-Aldrich | PX1476 | Potassium Hydrogen Phthalate Meets ACS Specifications GR ACS | 877-24-7 | 2.5KG | $307 | 2026-04-30 | Buy |
| Sigma-Aldrich | SRP5175 | CDKN3, GST tagged human recombinant, expressed in baculovirus infected Sf9 cells, ≥70% (SDS-PAGE), buffered aqueous glycerol solution | 20 μg | $394 | 2026-04-30 | Buy | |
| Sigma-Aldrich | PX1476 | Potassium Hydrogen Phthalate Meets ACS Specifications GR ACS | 877-24-7 | 12KG | $1600 | 2026-04-30 | Buy |
| Sigma-Aldrich | NIST84L | Potassium hydrogen phthalate NIST? SRM? 84l | 877-24-7 | 60g | $944 | 2026-04-30 | Buy |
Potassium hydrogen phthalate Chemical Properties, Uses, Production
Chemical Properties
white crystalline powder
Uses
As primary standard for preparing volumetric alkali solutions, also as a buffer in pH determinations.
Uses
As a primary standard for preparing volumetric alkali solutions and as a buffer in pH determinations. Potassium hydrogen phthalate is used as a primary standard for acid- base titrations as well as for calibrating pH meters. It acts as a buffer in pH determination. It finds application as a useful standard for total organic carbon testing.
Uses
Potassium hydrogen phthalate [KHP; pH(S) = 4.005 (25 °C)] is a certified secondary standard reference material used as a calibration buffer standard for pH instruments or pH electrodes.
General Description
Flammability and Explosibility
Not classified
Purification Methods
Crystallise it first from a dilute aqueous solution of K2CO3, then H2O (3mL/g) between 100o and 0o. Before being used as a standard in volumetric analysis, analytical grade potassium hydrogen phthalate should be dried at 120o for 2hours, then allowed to cool in a desiccator. [Beilstein 9 IV 3169.]
Potassium hydrogen phthalate Preparation Products And Raw materials
Global Suppliers ( 569)
| Supplier | Tel | Country | ProdList | Advantage | |
|---|---|---|---|---|---|
| Shanghai Aladdin Bio-Chem Technology Co.,LTD | 400-6206333 13167063860 | anhua.mao@aladdin-e.com | China | 29985 | 65 |
| Manhag Testing Technology Co., Ltd | 400-818 0104 18918165978 | yanyan.guo@bestown.net.cn | China | 7770 | 58 |
| Jiangyin shell Chemical Co., Ltd | 0510-15312220685 15312220685 | 3750554602@qq.com | China | 326 | 58 |
| Shenyang Shengyuan chemical industry co., ltd | 13190211560 | 1319074246@qq.com | China | 95 | 58 |
| henyang Zhuohua Biotechnology Co., Ltd. | 13940293610 13940293610 | 332189598@qq.com | China | 96 | 58 |
| J & K SCIENTIFIC LTD. | 18210857532 18210857532 | jkinfo@jkchemical.com | China | 96815 | 76 |
| Meryer (Shanghai) Chemical Technology Co., Ltd. | 4006356688 18621169109 | market03@meryer.com | China | 40202 | 62 |
| 3B Pharmachem (Wuhan) International Co.,Ltd. | 18930552037 | 3bsc@sina.com | China | 15813 | 69 |
| Alfa Aesar | 400-6106006 | saleschina@alfa-asia.com | China | 30103 | 84 |
| TCI (Shanghai) Development Co., Ltd. | 021-67121386 | Sales-CN@TCIchemicals.com | China | 24512 | 81 |
Related articles
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- Aug 12,2026
Related Questions
Ask a questionQ:How do you prepare a potassium hydrogen phthalate buffer solution?STAR - Jun 25,2026
A:Potassium hydrogen phthalate (KHP) buffer solution is a highly stable standard solution, primarily used for calibrating pH meters and electrodes. Method for preparing a 0.05 M standard KHP solution (pH 4.00): Accurately weigh out 10.21 g of KHP and place it in a clean 500 mL beaker. Add 400 mL of deionised water to the beaker, allow to dissolve, and leave to stand for 10 minutes. Transfer the solution to a 1000 mL volumetric flask, make up to the 1000 mL mark with water, secure the stopper tightly, and invert the flask several times to ensure the solution is homogeneous.
View Latest Price from Potassium hydrogen phthalate manufacturers
| Image | Update time | Product | Price | Min. Order | Purity | Supply Ability | Manufacturer | |
|---|---|---|---|---|---|---|---|---|
 |
2026-05-28 | Potassium Hydrogen Phthalate
877-24-7
|
$6.00 | 1kg | 99% | 10000kg | Hebei Chuanghai Biotechnology Co,.LTD | |
 |
2026-03-20 | Potassium hydrogen phthalate
877-24-7
|
$10.00 | 100KG | 99% | 100 mt | Hebei Chuanghai Biotechnology Co., Ltd | |
 |
2026-02-06 | Potassium hydrogen phthalate
877-24-7
|
$1.00-25.00 | 1kg | 99+ | 80000 | JIANGYIN SHELLCHEMICAL |
-
- Potassium Hydrogen Phthalate
877-24-7
- $6.00
- 99%
- Hebei Chuanghai Biotechnology Co,.LTD
-
- Potassium hydrogen phthalate
877-24-7
- $10.00
- 99%
- Hebei Chuanghai Biotechnology Co., Ltd
-
- Potassium hydrogen phthalate
877-24-7
- $1.00-25.00
- 99+
- JIANGYIN SHELLCHEMICAL
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