- Why indicator is not used in KMnO4 titration?
- Why is KMnO4 a self indicator?
- How does k2cr2o7 react with conc HCl?
- What does potassium permanganate react with?
- Why is hno3 not used to acidify KMnO4?
- Why is h2so4 used instead of HCl?
- Why is concentrated HCL an unsuitable replacement for sulfuric acid?
- Why Dil h2so4 added during titration?
- What happens when KMnO4 reacts with HCl?
- Why can’t we acidify KMnO4 with HCl in redox titration with Mohr’s salt?
- Why HCl is not used in redox titration?
- What happens when solid potassium permanganate is treated with conc h2so4?
Why indicator is not used in KMnO4 titration?
The color of the permanganate IS the indicator.
As you add the permanganate titrant to reaction vessel, the intensely colored MnO4- is reduced to the (almost) colorless Mn2+.
The first drop of excess MnO4- will impart a permanent pink color to the reaction solution—so there is no need for an added indicator..
Why is KMnO4 a self indicator?
KMnO4 solutions are dark purple. When used as a titrant, as soon as the endpoint is reached and the KMnO4- is in excess, the solution has a permanent pink hue (provided that the solution is initially colorless). Thus KMnO4 acts as its own indicator.
How does k2cr2o7 react with conc HCl?
Potassium dichromate react with hydrogen chloride to produce potassium chloride, chromium dioxide-dichloride and water. This reaction takes place heating the reaction mixture.
What does potassium permanganate react with?
Glycols and polyols are highly reactive toward KMnO4. For example, addition of potassium permanganate to an aqueous solution of sugar and sodium hydroxide produces the chemical chameleon reaction, which involves dramatic color changes associated with the various oxidation states of manganese.
Why is hno3 not used to acidify KMnO4?
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 is concentrated HCL an unsuitable replacement for sulfuric acid?
As dilute sulfuric acid is ideal for redox titration because it is neither an oxidizing agent and nor a reducing agent. HCL being a strong electrolyte dissociates in water to give H+ and Cl- ions. KMnO4 being a strong oxidising agent oxidises Chloride ion(Cl-) to Cl2.
Why Dil h2so4 added during 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.
What happens when KMnO4 reacts with HCl?
Potassium permanganate is a powerful oxidising agent and it does react with conc. HCl at high temperatures. It is a redox reaction. Hydrochloric acid, a mild reducing agent, is oxidised to free chlorine gas when it is heated with the permanganate salt.
Why can’t we acidify KMnO4 with HCl in redox titration with Mohr’s salt?
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 HCl is not used in redox titration?
Acid is needed to provide the H+ (aq) ions, so that this particular reaction occurs. If HCl (aq) were used instead of sulfuric acid, the permanganate ions would oxidise the Cl- ions to form Cl2 (g) and so would not be available to react with the oxalic acid.
What happens when solid potassium permanganate is treated with conc h2so4?
When potassium permanganate is dissolved in concentrated sulphuric acid,a highly explosive substance,Mn₂O7 is formed. This explosive Mn₂O7 further changes to MnO₂. In this reaction oxidation state of manganese and oxygen changes.