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Lecture- 17
Subject – Pharmaceutical Analysis-I
Course – B. Pharm 1st Year
Faculty Name – Umesh Kumar
Dichrometry
 These are titrations in which, potassium dichromate is
used as in oxidising agent in acidic medium.
 The medium is maintained acidic by the use of dilute
sulphuric acid.
 The solution of potassium dichromate can be directly
used for titrations.
 It is mainly used for the estimation of ferrous salts and
iodides.
Conti………
 The half reaction for the dichromate system is:
7Cr2O 2- + 14H+ + 6e- → 2Cr3+ + 7H2O
Conti……
 dichromate titrations require an
indicator.
 There are three indicators that may be
used for the titration of Fe2+ with
K2Cr2O7.
 These are diphenylamine,
diphenylbenzidine and
diphenylamine sulfonate.
 The colour change for all three
indicators is green to violet.
Advantages of Potassium Dichromate (K2Cr2O7) as
powerful oxidizing agent;
◦ It is available in pure form and stable form.
◦ The standard solution of exactly known concentration of
K2Cr2O7 can be prepared by weighing out the pure dry salt and
dissolving it in proper volume of water.
◦ Aqueous solution is sufficiently stable on proper storage.
◦ It can be used in acid as well as alkaline solution.
◦ It is stable towards light.
Principle
 Ferrous ammonium sulphate (FAS) or Mohr’s salt is a
stable double salt with FeSO4 as an active constituent.
 Acidic potassium dichromate solution is a strong
oxidizing agent and is rapidly reduced by ferrous ion at
the ordinary temperature to green chromic acid when
added to FAS solution containing dilute sulphuric acid.
 In this reaction ferrous sulphate is oxidized to ferric
sulphate while ammonium sulphate remains unreacted.
N-phenyl anthranilic acid is used as an indicator.
Conti………
 Indicator is not oxidised as long as Fe+2 ions are there in
the solution.
 The slight excess amount of dichromate will oxidize the
indicator when all the Fe+2 ions have been converted to
Fe+3 ions resulting in colour change of the solution from
green to purple.
To be continued in Next video

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Lecture - 17 Dichrometry.pptx

  • 1. Lecture- 17 Subject – Pharmaceutical Analysis-I Course – B. Pharm 1st Year Faculty Name – Umesh Kumar
  • 2. Dichrometry  These are titrations in which, potassium dichromate is used as in oxidising agent in acidic medium.  The medium is maintained acidic by the use of dilute sulphuric acid.  The solution of potassium dichromate can be directly used for titrations.  It is mainly used for the estimation of ferrous salts and iodides.
  • 3. Conti………  The half reaction for the dichromate system is: 7Cr2O 2- + 14H+ + 6e- → 2Cr3+ + 7H2O
  • 4. Conti……  dichromate titrations require an indicator.  There are three indicators that may be used for the titration of Fe2+ with K2Cr2O7.  These are diphenylamine, diphenylbenzidine and diphenylamine sulfonate.  The colour change for all three indicators is green to violet.
  • 5. Advantages of Potassium Dichromate (K2Cr2O7) as powerful oxidizing agent; ◦ It is available in pure form and stable form. ◦ The standard solution of exactly known concentration of K2Cr2O7 can be prepared by weighing out the pure dry salt and dissolving it in proper volume of water. ◦ Aqueous solution is sufficiently stable on proper storage. ◦ It can be used in acid as well as alkaline solution. ◦ It is stable towards light.
  • 6. Principle  Ferrous ammonium sulphate (FAS) or Mohr’s salt is a stable double salt with FeSO4 as an active constituent.  Acidic potassium dichromate solution is a strong oxidizing agent and is rapidly reduced by ferrous ion at the ordinary temperature to green chromic acid when added to FAS solution containing dilute sulphuric acid.  In this reaction ferrous sulphate is oxidized to ferric sulphate while ammonium sulphate remains unreacted. N-phenyl anthranilic acid is used as an indicator.
  • 7. Conti………  Indicator is not oxidised as long as Fe+2 ions are there in the solution.  The slight excess amount of dichromate will oxidize the indicator when all the Fe+2 ions have been converted to Fe+3 ions resulting in colour change of the solution from green to purple.
  • 8.
  • 9. To be continued in Next video