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Why is potassium hydrogen phthalate KHP used to standardize the NaOH which will be used during the experiment?
Potassium hydrogen phthalate, often called simply KHP, is an acidic salt compound. KHP is slightly acidic, and it is often used as a primary standard for acid–base titrations because it is solid and air-stable, making it easy to weigh accurately. It is not hygroscopic.
How do you standardize NaOH with KHP?
To Standardize: Record the amount of KHP and water used. Add 4 drops of indicator into the flask and titrate to the first permanent appearance of pink. Near the endpoint, add the NaOH dropwise to determine the total volume most accurately.
How do you find the mass of an unknown KHP?
The mass of KHP present in the sample is calculated by multiplying the number of moles of KHP by the molecular weight of KHP.
How do you find the molarity of KHP?
Moles of KHP=0.6939⋅g204.22⋅g⋅mol−1=3.398×10−3⋅mol. And since this molar quantity reacted with 26.55⋅mL of titrant…
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.
What is the reaction between KHP and NaOH?
reaction is called a neutralization reaction because two caustic compounds, KHP, a mild acid, and NaOH, a strong base, are replaced by water and a weaker base.
What is KHP chemistry?
Potassium Acid Phthalate, KHP. Chemical Formula.
What is the chemical equation for KHP and NaOH?
We have a balanced chemical equation in which we now know the exact quantity of one of the reagents (KHP) – NaOH(aq) + KHC8H4O4(aq) = KNaC8H4O4(aq) + H2O(l) – thus we can determine the number of moles of NaOH that reacted with the KHP….Stoichiometry and Solutions.
| M = | mol |
|---|---|
| V(L) |
What is the percentage of KHP in this sample?
The KHP is 96.1 % pure.
What is the molar mass of KHP?
204.22 g/mol
Potassium hydrogen phthalate/Molar mass
KHP (MWT = 204.22 g/mol) is a monobasic acid that contains one mole of neutralizable hydrogen per mole of compound.
What is molarity of KHP?
The “P” in “KHP” is an abbreviation for the phthalate ion (C8H4O-) not a phosphorus atom: the molar mass of KHP is 204.2 g.
What is the percent KHP of the sample?
What happens when a sample is contaminated with NaCl?
If the sample is contaminated with NaCl, then some of the mass of KHP would be replaced by NaCl. As a result, we have less amount of KHP available to react with NaOH than the actual. This would give us less amount of NaOH , because part of the KHP is replaced by NaCl which is non reactive .
Why is KHP used in standardization of NaOH?
Answer : The calculated molarity of the NaOH solution would be lower than the actual . In the standardization of NaOH using KHP, an accurately weighed sample of KHP is used. KHP is a primary standard which means it is highly stable and does not absorb water. Therefore it can be used to standardize reagents used for the chemical reaction.
What happens to the amount of NaOH consumed during the reaction?
The amount of NaOH consumed during the reaction depends upon the amount of KHP. If the sample is contaminated with NaCl, then some of the mass of KHP would be replaced by NaCl. As a result, we have less amount of KHP available to react with NaOH than the actual.