Sulfuric acid often referred to as vitriol oil, is a mineral acid that has the chemical formula H2SO4 and is composed of the elements sulfur, oxygen, and hydrogen. It is a colorless, odorless, viscous liquid that is miscible in water. It plays a very important role in the reactions of different titrations because it is stable towards oxidation. Some of the commonly some of the most often asked questions about H2SO4 used in titration, along with their answers, are listed here, which will be useful to science students and researchers.
Titrimetry often referred to as titration, is a large method of quantifying the analyte in a sample solution. A titrant is placed in the burette, a solute is placed in the conical flask where the reaction takes place, and a color change indicator is added to determine its endpoint or equivalence point.
In which a primary standard solution and secondary standard solution are the two major types of standard solutions are used; a primary standard is a substance with high purity (99.9%) while secondary solutions have a low purity and high reactivity. There are four types based on the type of reaction involved acid-base titrations, complexometric titration, redox titrations, and precipitation titrations.
Frequently Asked Questions (FAQ):
How do you titrate H2SO4?
Click here to get detailed information about the preparation and standardization of 1 m H2SO4.
How will you prepare 0.1 normality of H2SO4?
Pour 500 ml of distilled water into a 1-liter volumetric flask, carefully add 05.43 ml of concentrated sulfuric acid and make up the volume and mix well.
Is H2SO4 a reducing agent?
Sulfuric acid is a powerful oxidizer in which sulphur is in a +6 oxidation state. A redox reaction also has 4 oxygens that it can provide to reducing agents. The oxidizing state of sulphur cannot get any higher; it can only fall. As a result, it is classified as an oxidizing agent, although one that is not as strong as KMnO4.
Phenolphthalein is not a suitable indicator for titration between
Phenolphthalein indicator is not a suitable indicator for titration between HCl and NH4OH (strong acid and weak base), oxalic acid and KMnO4, and ferrous sulphate against KMnO4, etc. In which the phenolphthalein is useless as an indicator since its pH range is 08.30 to 10.0. Phenolphthalein is the best option for a weak acid vs. strong base titration.
What is the color of methyl orange in H2SO4?
In an acidic medium, methyl orange turns red, while in a basic condition, it turns yellow. It's commonly used in titration for acids since it changes color at the pKa of a mid-strength acid.
What is the indicator used when H2SO4 is titrated with NaOH?
Phenolphthalein indicator is used in the titration of sulfuric acid (H2SO4) with sodium hydroxide (NaOH). In acids, it is colorless, and when the entire volume of the analyte has reacted with a small amount of the titrant, the color changes to pink.
What is the role of sulfuric acid when doing the titration of sodium oxalate with potassium permanganate?
Sufficient sulphuric acid is added during the standardization of potassium permanganate against sodium oxalate which is used as a primary standard. The role of sulfuric acid is to provide an oxidation-reduction reaction in which potassium permanganate acts as the oxidizing agent and sodium oxalate acts as the reducing agent.
What happens when potassium permanganate reacts with sulphuric acid?
The reaction of potassium permanganate and sulfuric acid produces ozone, which has strong oxidizing power and quickly oxidizes the alcohol, causing it to combust.
Which acid is stronger H2SO4 or HNO3?
H2SO4 is stronger than HNO3 because it includes four atoms of 02 and two atoms of H2, but HNO3 only has three atoms of O2 and one atom of H2. As a result, H2SO4 is more reactive than HNO3.
Why do we use H2SO4 instead of HNO3 or HCl?
Because H2SO4 is neither oxidizing nor reducing in nature, it is frequently used with potassium permanganate (KMnO4) or potassium dichromate (K2Cr2O7). Hydrochloric acid (HCl) isn't a good choice because it will be oxidized to chlorine gas by the permanganate, while nitric acid (HNO3) is an oxidizing agent and can interfere with the reaction during the experiment.
Why H2SO4 is used in the titration of KMnO4?
Because KMnO4 can only act as an oxidizing agent in an acidic medium, hence, dilute sulfuric acid is added to provide an acidic medium. Sulphuric acid is added to keep the reaction going by preventing hydrolysis and providing surplus H+ ions in the solution. It is neither an oxidizing nor a reducing agent; dilute sulfuric acid is perfect for redox titration.
Why H2SO4 is used in the titration of Mohr salt?
To prevent hydrolysis concentrated sulphuric acid is added to Mohr's salt crystals during the preparation of the standard solution. One more reason is to prevent the oxidation of Fe2+ ions of Mohr's salt to Fe3+ ions.
Why is concentrated sulphuric acid used to prepare nitric acid?
The boiling point of concentrated H2SO4 is very high, it is classified as non-volatile. As a result, it's employed to prepare volatile acids like hydrochloric acid (HCl) and nitric acid (HNo3), and acetic acid (CH3COOH) from their salts by double decomposition. It generally has the role of moisture trapping.
Why is sulphuric acid used in redox titration?
H2SO4 is utilized in the redox titration since it gives the H (+) ions which are essential for the response to occur rapidly while the sulfate (-) ions scarcely react throughout the response. It can be used to give an acidic medium.
Why is universal indicator not used in titration?
Due to the diverse pH ranges of universal indicators, it becomes difficult to determine the specific pH of the solution. Subsequently, the universal indicator is not used in the titration.
Why KMnO4 is added slowly in the titration?
During redox titration, KMnO4 is slowly added to ensure that the reaction is complete. Because of the high concentration, it can do side reactions. As the permanganate reacts with the sample under certain heat and acidity circumstances, the Mn in the 7+ oxidation state in the permanganate will reduce to the 2+ state.
Why one test tube of 2m sulphuric acid is required in permanganate titration?
To prevent oxidation of manganese to form manganese dioxide, one test tube of 2m H2SO4 is required in permanganate titration. Before titrating with potassium permanganate, heat the mixture to 60°C.
Why only H2SO4 is used in KMnO4 titration?
Titration of potassium permanganate (KMnO4) should be performed in a strong acid solution. Therefore sulfuric acid is commonly used instead of HCl, nitric acid, and hydrochloric acid which can participate in competitive oxidation-reduction reactions, reducing the accuracy of the titration.
Why sulphuric acid is added in oxalic acid titration?
Sulfuric acid is added in oxalic acid titration to provide surplus H+ ions in the solution to prevent hydrolysis and to proceed with the reaction and also sulphuric acid is stable towards oxidation.
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