Why is HCl not used in KMnO4 titration?

Hydrochloric acid (HCl) is usually not used in the process of titration because it reacts with the indicator potassium permanganate (KMnO4) that is used in the process. It reacts with KMnO4 solution and gets oxidized which further results in the liberation of chlorine gas.

What will happen if HCl will be used instead of H2SO4 in titration?

HCl and HNO3 are not used in the titration of Mohr’s salt in place of sulfuric acid because: HCl is a mild reducing agent and it reacts with some of the indicator that is KMnO4 solution so the final value of the indicator used come to be more than the actual value disturbing the experiment.

Why KMnO4 Cannot be used in presence of HCl or HNO3 in titration?

The acid used in this titration is dilute sulphuric acid. Nitric acid is not used as it is itself an oxidising agent and hydrochloric acid is usually avoided because it reacts with KMnO4 according to the equation given below to produce chlorine and chlorine which is also an oxidising agent in the aqueous solution.

Why is H2SO4 used instead of HCl?

Sulfuric acid is used because it is stable towards oxidation; whereas, for example, hydrochloric acid would be oxidized to chlorine by permanganate.

Why we add H2SO4 in iodometric titration?

Sulphuric Acid (H2SO4) is used in the redox titration process because it provides the H(+) ions necessary for the reaction to occur more quickly whilst the sulphate(-) ions barely react during the reaction. Therefore, sulfuric acid is added to make the solution acidic.

Why do we use H2SO4 instead of HNO3 or HCl?

HCl isn’t suitable, as will be oxidised to chlorine gas by the permanganate whilst HNO3 is an oxidising agent itself and would interfere with the reaction. H2SO4 (as long as it’s dilute) doesn’t have this problem, so is the preferred medium for such oxidations (especially for titrations).

Why H2SO4 is used instead of HCl?

What is the difference between H2SO4 and HCl?

Generally, both Hydrochloric acid (HCl) and Sulfuric acid (H2SO4) are really strong acids compared to any other acids. However, HCl is stronger than H2SO4. This is mainly due to the difference in the basicity of both acids. Additionally, if we look at the pKa value HCl has a pKa of -6.3 and sulfuric acid has a pKa ~-3.

Why dilute H2SO4 is the most suitable as compared to HCl and HNO3 in potassium permanganate titration?

HNO3 is also a powerful oxidizing agent along with KMnO4 so it also plays its role in oxidation which causes a decline in the value of KMNo4 used. As dilute sulfuric acid is ideal for redox titration because it is neither an oxidizing agent and nor a reducing agent.

Why KMnO4 solution should not be added to rapidly during a titration?

Finely divided MnO2 will form if the KMnO4 is added too rapidly and will cause the solution to acquire a faint brown discoloring. This is not a serious problem of sufficient oxylate remains to reduce the MnO2 to Mn2+; simply discontinue the titration until the brown color disappears.

Why is H2SO4 used instead of HCL?

Why can’t we use nitric acid instead of HCl in KMnO4?

HCl is not used because some of the KMnO4 will oxidize chloride ions to chlorine gas. Nitric acid cannot be used because it is itself a strong oxidizing agent and may oxidize the reducing agent, thereby introducing error in the analysis. , B.S., M.S.,

Why H2SO4 is not used in titration of KMnO4?

Generally when creating an acidic medium for titration with KMnO4, the acid of choice is H2SO4 as the S is in a +6 oxidation state and cannot be further oxidised. HCl is not used since the Cl- can be oxidised to give Cl2.

What happens when H2SO4 is added to MnO4?

H2SO4 increase the acidic content of the solution so as to prevent MnO4 (purple) to reduced to MnO2 (dark brow). Hence sulfuric acid is stable in the present of strong oxidising agent. If HCl acid is use it will be oxidised to Cl and make the end point much higher.

Why is KMnO4 used as a self indicator in potassium permanganate solution?

The moment there is an excess of potassium permanganate present the solution becomes purple. Thus, KMnO4 serves as self indicator in acidic solution. Potassium permanganate is standardized against pure oxalic acid. It involves a redox reaction. Oxalic acid is oxidised to carbon dioxide by KMnO 4, which itself gets reduced to MnSO 4.