is khp a primary standard

It forms white powder, colorless crystals, a colorless solution, and an ionic solid that is the monopotassium salt of phthalic acid

. 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.

Full Answer

What does KHP stand for?

Cm B C) 90 Potassium hydrogen phthalate (KHP) is a widely used primary standard (functioning as a mono- protic acid) for acid/base titrations.

What is potassium hydrogen phthalate (KHP)?

Potassium hydrogen phthalate. 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. It is also used as a primary standard for calibrating pH meters because, besides the properties just mentioned,...

Is KHP an acid or base or neutral?

Potassium hydrogen phthalate, often called simply KHP, is an acidic salt compound. It forms white powder, colorless crystals, a colorless solution, and an ionic solid that is the monopotassium salt of phthalic acid. KHP is slightly acidic, and it is often used as a primary standard for acid-base titrations because it is solid and air-stable, ...

What is KHP used for titration?

Cm B C) 90 Potassium hydrogen phthalate (KHP) is a widely used primary standard (functioning as a mono- protic acid) for acid/base titrations. The titration curve in Table 1 shows an example of using KHP to determine NaOH concentration (a process called standardization).

Is KHP a primary standard solution?

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.

Is KHP a secondary standard?

Potassium Hydrogen Phthalate (KHP) is a classic primary standard substance in that it is readily available in high purity; is relatively inexpensive; is easy to dry; is neither hygroscopic, oxidized by air, nor affected by Carbon Dioxide (thus making it easy to weigh out); does not undergo decomposition during storage; ...

What makes KHP a good primary standard?

Potassium hydrogen phthalate makes for a good primary standard because it is stable, high in purity, non-hydroscopic, highly soluble, non-toxic, high in molecular weight, cheap, and available.

Why is KHP chosen as the primary standard for NaOH What are the other primary standards for NaOH?

To check the concentration of NaOH, a chemist must titrate a primary standard—in this case, a solution of potassium hydrogen phthalate (KHP). KHP does not absorb water or carbon dioxide, and it can provide visual confirmation that a 1-gram solution of NaOH really contains 1 gram.

What is the KHP standard?

Potassium hydrogen phthalate (KHP) is a widely used primary standard (functioning as a mono- protic acid) for acid/base titrations.

Which substance is primary standard?

A primary standard is a reagent that is extremely pure, stable, has no water of hydration and has a high molecular weight . Some primary standards are sodium carbonate, potassium hydrogen iodate, potassium dichromate, oxalic acid etc.

What are primary standards in titration?

A primary standard is a reference chemical used to measure an unknown concentration of another known chemical. It can be used directly when performing titrations or used to calibrate standard solutions.

What is primary standard and secondary standard in titration?

A primary standard is an ultrapure compound that serves as the reference material for a titration or for another type of quantitative analysis. A secondary standard is a compound whose purity has been determined by chemical analysis.

Why NaOH is not a primary standard?

NaOH has no criteria given above. It is not suitable for the primary standards because they absorb the moisture from the atmosphere. It also absorbs carbon dioxide from the atmosphere. Hence, NaOH is not a primary standard because it has no quality of primary standard.

What is used as primary standard for standardization of NaOH?

In this experiment, the primary standard is oxalic acid dihydrate, H2C2O4 ∙ 2H2O. It will be used to standardize a solution of sodium hydroxide. Sodium hydroxide solutions pick up carbon dioxide from the air.

What is the difference between a primary and secondary standard?

But what, exactly, is the difference between primary vs secondary standards? To put it simply, a primary standard is a factual universal measurement while a secondary standard is a device directly calibrated previously by the primary standard.

Why KMnO4 is not a primary standard?

KMnO4 is not used as primary standard because it is difficult to obtain the pure state of KMnO4 as it is not free from MnO2. Also, the colour is so intense that it acts as its own indicator. Stay tuned with BYJU'S to learn more about other concepts such as types of titration.

Is NaOH a secondary standard?

Note: NaOH is secondary standard because NaOH contains impurities of NaCl, Na2SO4 etc. It absorbs water from the atmosphere and determines the concentration of NaOH in a solution, which is titrated against a primary standard weak acid.

Is HCl a primary standard?

HCl cannot be considered to be a primary standard because of its gaseous form at room temperature, but its solutions may be standardized against anhydrous Na2CO3.

Why NaOH is not a primary standard?

NaOH is not suitable for use as a primary standard because they readily absorb moisture, H2O, from the atmosphere. They readily absorb carbon dioxide from the atmosphere.

What is the use of KHP in acid base titration?

The titration of NaOH with KHP involves adding NaOH from the burette to a known volume of KHP. The molarity of the KHP solution is determined from the mass and volume of KHP used to prepare the KHP solution. The data from the titration is then used to calculate the molarity of the NaOH.

What is KHP used for?

KHP is used in the manufacture of buffers, organic carbon standards, acidimetric standards and other products. It is also used in the quality control of Potassium Hydroxide and Sodium Hydroxide solutions, and in the standardization of Perchloric Acid in Glacial Acetic Acid. A typical acidimetric reaction is:

What is the phenolphthalein indicator used for?

Phenolphthalein Indicator is most commonly used in titrations where KHP is used as an acidimetric standard to standardize solutions of bases. 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.

Is potassium a standard substance?

Potassium Hydrogen Phthalate. Potassium Hydrogen Phthalate (KHP) is a classic primary standard substance in that it is readily available in high purity; is relatively inexpensive; is easy to dry; is neither hygroscopic, oxidized by air, nor affected by Carbon Dioxide (thus making it easy to weigh out); does not undergo decomposition during storage;

What is the mass of KHP transfer?

Mass of KHP Transfer = Weight of weighing boat with KHP – Weight of weighing boat after transfer

What is potassium hydrogen phthalate?

Potassium Hydrogen Phthalate ( referred to in the experiment as KHP) was a brittle, white, crystalline substance. The crystals required intense stirring before it could dissolved in water. The resultant Acidic solution was transparent, with a small amount of undissolved granules of KHP.

What is the uncertainty of NaOH?

The percentage uncertainty calculated of the concentration of NaOH was 2.57%, which indicates that the level of precision, although not low, could have been better. The expected % uncertainty that was expected was 0.500%, and the uncertainty I obtained was 0.503%. Also, the % uncertainty of the volume of NaOH was ±1.05%, taking the value of 9.50 cm 3. Therefore, due to flaws in raw data values taken from systematic errors, there has been a deviation in uncertainty too, indicating the impact of methodical flaws. The uncertainty of 2.57% indicates that my values were accurate up to within ±2.57%.

What is the theoretical value of sodium hydroxyl?

The theoretical value of the Sodium Hydroxide that was expected to be used was 9.50 cm 3. However, there has been a deviation of 0.9 cm 3, which is significant, but not high. The resulting percentage error out of this deviation is: