ChemicalBook > CAS DataBase List > Potassium hydrogen phthalate

Potassium hydrogen phthalate

Product Name: 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;PHOSPHATE BUFF, PH 7.5;Potassium hydrogen phthalate, acidimetric standard;KHP, Phthalic acid monopotassium salt, Potassium biphthalate, Potassium hydrogen phthalate;CIP2
CBNumber: CB1132397
Molecular Formula: C8H5KO4
Formula Weight: 204.22
MOL File: 877-24-7.mol

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Potassium hydrogen phthalate Property

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.
InChIKey: IWZKICVEHNUQTL-UHFFFAOYSA-M
LogP: -2.73
CAS DataBase Reference: 877-24-7(CAS DataBase Reference)
EPA Substance Registry System: Monopotassium phthalate (877-24-7)
Absorption: cut-off at 309nm in H2O at 0.1M

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Safety

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: Yes
HS Code: 29173990
Toxicity: LD50 orally in Rabbit: > 3200 mg/kg

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Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H315Causes skin irritation

H319Causes serious eye irritation

Precautionary statements

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P302+P352IF ON SKIN: wash with plenty of soap and water.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P332+P313IF SKIN irritation occurs: Get medical advice/attention.

P337+P313IF eye irritation persists: Get medical advice/attention.

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N-Bromosuccinimide Price

Sigma-Aldrich

Product number: PX1476
Product name: Potassium Hydrogen Phthalate
Purity: Meets ACS Specifications GR ACS
Packaging: 500G
Price: $182
Updated: 2025/07/31

Sigma-Aldrich

Product number: PX1476
Product name: Potassium Hydrogen Phthalate
Purity: Meets ACS Specifications GR ACS
Packaging: 2.5KG
Price: $292
Updated: 2025/07/31

Sigma-Aldrich

Product number: SRP5175
Product name: CDKN3, GST tagged human
Purity: recombinant, expressed in baculovirus infected <I>Sf</I>9 cells, ≥70% (SDS-PAGE), buffered aqueous glycerol solution
Packaging: 20 μg
Price: $362
Updated: 2025/07/31

Sigma-Aldrich

Product number: PX1476
Product name: Potassium Hydrogen Phthalate
Purity: Meets ACS Specifications GR ACS
Packaging: 12KG
Price: $1520
Updated: 2025/07/31

Sigma-Aldrich

Product number: P5244
Product name: Phosphate buffer solution
Purity: 0.1?M
Packaging: 100mL
Price: $49.14
Updated: 2025/07/31

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Potassium hydrogen phthalate Chemical Properties,Usage,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

SRM 2185_cert SRM 2185 _SDS

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

Raw materials

Potassium hydroxide Phthalic anhydride

Preparation Products

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View Lastest Price from Potassium hydrogen phthalate manufacturers

Hebei Chuanghai Biotechnology Co., Ltd

Product: Potassium hydrogen phthalate 877-24-7
Price: US $10.00/KG
Min. Order: 100KG
Purity: 99%
Supply Ability: 100 mt
Release date: 2024-10-31

Hebei Zhuanglai Chemical Trading Co.,Ltd

Product: Potassium hydrogen phthalate 877-24-7
Price: US $70.00/kg
Min. Order: 1kg
Purity: 99
Supply Ability: 5000
Release date: 2024-06-06

Hebei Chuanghai Biotechnology Co,.LTD

Product: Potassium Hydrogen Phthalate 877-24-7
Price: US $6.00/kg
Min. Order: 1kg
Purity: 99%
Supply Ability: 10000kg
Release date: 2024-08-21

877-24-7, Potassium hydrogen phthalateRelated Search:

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Potassium hydrogen phthalate, reagent ACS, acidimetric standard

POTASSIUM ACID PHTHALATE BIO-REFINED

potassium hydrogen phthalate, primary standard, acs

POTASSIUMBIPHTHALATE,BIOTECHGRADE

POTASSIUMBIPHTHALATE,CRYSTAL,REAGENTSPECIAL,ACS

POTASSIUMBIPHTHALATE,ULTRAPURE

SODIUM AMYL XANTHTATE

POTASSIUM ACID PHTHALATE PRIMARY STANDARD (ACS)

POTASSIUM ACID PHTHALATE SOLUTION, 0.100 N

KAP(potassium acid phthalate)

2,5-dimethyl-4-nitro-2H-pyrazole-3-

4-(4-fluoro-phenoxymethyl)-benzoate

Potassium hydrogen phthalate, 0.05N Standardized Solution

Potassium hydrogen phthalate, primary standard, ACS, 99.95-100.05%

Hydrogen potassium phthalate: (Phthalic acid, monopotassium salt)

POTASSIUM HYDROGEN PHTHALATE extrapure AR

Potassium acid phthalate, 0.05N Standardized Solution

KHP, Phthalic acid monopotassium salt, Potassium biphthalate, Potassium hydrogen phthalate

Potassium Biphthalate, Crystal, Reagent Special

POTASSIUM HYDROGEN PHTHALATE CERTIFIED S

POTASSIUM HYDROGEN PHTHALATE FOR ANALYSI

POTASSIUM HYDROGEN PHTHALATE VOLUMETRIC

1,2-Benzenedicarboxylic acid, MonopotassiuM salt (9CI)

KAP

MonopotassiuM 1,2-benzenedicarboxylate

Phthalic acid, MonopotassiuM salt (8CI)

potassiuM 2-carboxybenzoate

PotassiuM Biphthalate, Reagent, ACS

PotassiuM Hydrogen Phthalate, AcidiMetric Standard, Crystal, Reagent Special, ACS

ELECTRODE STORAGE SOLN

ELECTRODE STORAGE SOLUTION

Potassium hydrogen phthalate, acidimetric standard, 99.99%

CDKN3, GST tagged human

CIP2

FLJ25787

MGC70625

potassiuM 2-carboxybenzoate dihydrate

1,2-Benzenedicarboxylicacid, potassiuM salt (1:1)

ANTI-KAP (CENTER) antibody produced in rabbit

Potassium phthalate monobasic ACS reagent, acidimetric standard

Potassium phthalate monobasic puriss. p.a., >=99.5% (T)

Potassium phthalate monobasic Vetec(TM) reagent grade, 99%

KHP, Phthalic acid monopotassium salt, Potassium biphthalate, Potassium hydrogen phthalate, Potassium phthalate monobasic

PROTEIN ASSAY BRADFORD PROTEOMICS GRADE

BUFFER SOLUTION

COD STANDARD

FISHER ACCUMET METER ELECTRODE STORAGE SOLUTION

1,2-Benzenedicarboxylicacid,monopotassiumsalt

1,2-Benzenedicarboxylicacidmonopotassiumsalt

POTASSIUM DISODIUM PHOSPHATE

PHOSPHATE BUFF, PH 7.2

PHOSPHATE BUFF, PH 7.5

POTASSIUM HYDROGEN PHTHALATE, 99.95-100. 05%, A.C.S. ACIDIMETRIC STANDAR

POTASSIUM HYDROGEN PHTHALATE ACS*REAGENT ACIDIMETRI

POTASSIUM HYDROGEN PHTHALATE R. G., BUFF ER SUBSTANCE, REAG. PH. EUR.

POTASSIUM HYDROGENPHTHALATE, REAGENTPLUS , 99.99+%

POTASSIUM HYDROGEN PHTHALATE SIGMAULTRA

PotassiumHydrogenPhthalateAr