What is the pKa of KHP in the titration?
occurs at nearly the same pH as the pH at the reactions equivalence point. It turns out that the pka of KHP is 5.5.
What is the pH of potassium hydrogen phthalate?
The pH should be 4.00–4.02 at 25.0 ± 0.2 °C.
What is the Ka value of KHP?
The literature value of the Ka for KHP is 3.91×10^-6.
Is potassium hydrogen phthalate a weak acid?
Potassium hydrogen phthalate ( KHP ) has the molecular formula C8H5KO4 and is known to be a weak acid. Because the concentration of water is presumed constant and therefore not included in the expression, the equilibrium constant for this reaction is called acid dissociation constant, Ka .
Is potassium hydrogen phthalate an indicator?
When KHP is used as a basimetric standard (e.g., in standardization of Perchloric Acid in Glacial Acetic Acid), Methyl Violet or Crystal Violet indicator is commonly used….Potassium Hydrogen Phthalate.
| Potassium Hydrogen Phthalate Potassium Acid Phthalate, KHP | |
|---|---|
| Chemical Formula | HOCO(C6H4)COOK |
| CAS No. | 877-24-7 |
What pH is NaOH?
13.0
Some common bases as sodium hydroxide, ammonia and more
| Base | Normality | pH |
|---|---|---|
| Sodium carbonate (washing soda) | 0.1 N | 11.6 |
| Sodium hydroxide (caustic soda) | N | 14.0 |
| Sodium hydroxide | 0.1 N | 13.0 |
| Sodium hydroxide | 0.01 N | 12.0 |
What is the cation of potassium hydrogen phthalate?
(K+)
KHP dissociates completely in water, giving the potassium cation (K+) and hydrogen phthalate anion (HP− or Hphthalate−).
What is potassium hydrogen phthalate used for?
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.
Why is potassium hydrogen phthalate used?
Does pKa equal pH?
Remember that when the pH is equal to the pKa value, the proportion of the conjugate base and conjugate acid are equal to each other. As the pH increases, the proportion of conjugate base increases and predominates.