Advertisements
Advertisements
Questions
Why \[\ce{HCl}\] should not be used for potassium permanganate titrations?
Why is permanganate titration not carried out in the presence of \[\ce{HCl}\]?
Advertisements
Solution
Permanganate titrations in the presence of hydrochloric acid are unsatisfactory since hydrochloric acid is oxidised to chlorine. Permanganate titration cannot be performed with hydrochloric acid as it can be oxidized to produce chlorine gas. As a result, we do not obtain accurate endpoints for any titration.
APPEARS IN
RELATED QUESTIONS
When chromite ore FeCr2O4 is fused with NaOH in presence of air, a yellow-coloured compound (A) is obtained, which on acidification with dilute sulphuric acid gives a compound (B). Compound (B) on reaction with KCl forms an orange coloured crystalline compound (C).
(i) Write the formulae of the compounds (A), (B) and C.
(ii) Write one use of compound (C).
Complete the following equation :
`2MnO_4^(-)+6H^++5NO_2^(-)rarr`
Complete the following equations:Cr2O72- + 2OH- →
Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with iron (II) ions? Write the ionic equation for the reaction.
Write the formula of an oxo-anion of Manganese (Mn) in which it shows the oxidation state equal to its group number.
Write the ionic equation showing the oxidation of Fe(II) salt by acidified dichromate solutions.
Which of the following reactions are disproportionation reactions?
(a) \[\ce{Cu^{+} -> Cu^{2+} + Cu}\]
(b) \[\ce{3MnO^{-}4 + 4H^{+} -> 2MnO^{-}4 + MnO2 + 2H2O}\]
(c) \[\ce{2KMnO4 -> K2MnO4 + MnO2 + O2}\]
(d) \[\ce{2MnO^{-}4 + 3Mn^{2+} + 2H2O -> 5MnO2 + 4H^{+}}\]
Potassium permanganate on heating at 513 K gives a product which is ______.
Indicate the steps in the preparation of \[\ce{K2Cr2O7}\] from chromite ore.
Indicate the steps in the preparation of \[\ce{K2Cr2O7}\] from chromite ore.
