Table of Contents
Why is it wrong to substitute H2SO4 in the titration with HNO3 and HCl?
HCl and HNO3 are not used in the titration of Mohr’s salt in place of sulfuric acid because: 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.
Why is HCl not used to make HNO3?
HNO3 . Hint : $ HCl $ is not used in the titration with $ KMn{O_4} $ because it is not able to make the solution acidic in nature. It gets itself oxidised easily and hence does not provide sufficient hydrogen ions to make the solution suitable for titration.
Why could you not substitute H2SO4 for HNO3 in Part A?
Sulfuric acid cannot be substituted for nitric acid because aqua regia requires a strong oxidant, and sulfuric acid is not one; but sodium nitrate can often be used as a substitute for nitric acid.
Why H2SO4 require about twice the volume of NaOH solution for the titration?
The volume of H2SO4 required is smaller than the volume of NaOH because of the two hydrogen ions contributed by each molecule.
What would happen if you use HCl or HNO3 acid instead ofh2so4?
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.
Why is dilute HCl stronger than highly concentrated acetic acid?
HCl is a strong acid, CH3COOH is a weak acid. Strong and weak acid refer to the degrees of dissociation. HCl acid ionises completely to H+ and Cl- ions (that is, about 100 out of 100 molecules donate their hydrogen ion). Hence, dilute HCl acid is stronger than highly concentrated acetic acid.
Why is concentrated sulphuric acid used instead of concentrated nitric acid?
The sulphuric acid is used in the preparation of hydrogen chloride {HCl} and nitric acid {HNO3} because it is a non-volatile{ it has a high boiling point} and HCl and HNO3 are volatile acids.
What happens when HNO3 reacts with h2so4?
Sulfuric acid protonates nitric acid to form the nitronium ion (water molecule is lost). The nitronium ion is a very good electrophile and is open to attack by benzene. Without sulfuric acid the reaction would not occur. 4.
What happens when nitric acid is mixed with sulfuric acid?
A mixture of nitric and sulfuric acids introduces a nitro substituent onto various aromatic compounds by electrophilic aromatic substitution. Many explosives, such as TNT, are prepared this way: C6H5CH3 + 3 HNO3 → C6H2(NO2)3CH3 + 3 H2O. Either concentrated sulfuric acid or oleum absorbs the excess water.
Why must the titration be repeated three times?
Since you know how much standard you have used and its concentration you can work out the concentration of the unknown sample. Remember you should always repeat whole process at least 3 times to ensure you have an accurate result, as there is the potential for both random and systematic errors to affect your results.