Potassium Hydrogen Phthalate
CAS 877-24-7·C₈H₅KO₄
The primary standard for alkali standardisation and for pH 4.00 buffer preparation.
Grades offered
- ARAnalytical ReagentHigh purity with certified assay and stated trace-impurity limits.
- AR/ACSAnalytical Reagent, ACS specificationAR grade additionally meeting American Chemical Society limits.
Typical applications
- Primary standard for standardising NaOH
- pH 4.00 buffer preparation
- Total organic carbon (TOC) calibration standard
Potassium Hydrogen Phthalate
C₈H₅KO₄ · M.W. 204.22 g/mol
- CAS
- 877-24-7
- Assay
- ≥ 99.95% (primary standard)
- Batch
- Use before
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Pack sizes
- 100 g
- 500 g
Identification
| CAS number | 877-24-7 |
|---|---|
| Molecular formula | C₈H₅KO₄ |
| Molecular weight | 204.22 g/mol |
| Assay | ≥ 99.95% (primary standard) |
| Also known as | KHP, Potassium biphthalate, Potassium acid phthalate |
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