Is K2Cr2O7 more soluble in H2SO4 than water?

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SUMMARY

K2Cr2O7 (potassium dichromate) exhibits significantly higher solubility in concentrated sulfuric acid (H2SO4) compared to its solubility in water, which is only 4.9 g/100 mL. When K2Cr2O7 is dissolved in H2SO4, it undergoes protonation, leading to the formation of chromic acid. This reaction facilitates a greater dissolution of K2Cr2O7 in sulfuric acid, allowing for the preparation of Jones reagent effectively.

PREREQUISITES
  • Understanding of solubility principles in chemistry
  • Knowledge of acid-base reactions
  • Familiarity with the preparation of Jones reagent
  • Basic concepts of chromate and dichromate chemistry
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  • Research the solubility of chromic acid in concentrated sulfuric acid
  • Study the preparation and applications of Jones reagent
  • Explore the chemical properties of K2Cr2O7 in various solvents
  • Investigate the protonation effects on chromate salts in acidic solutions
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Chemistry students, laboratory technicians, and professionals involved in organic synthesis and reagent preparation will benefit from this discussion.

jmnew51
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I understand that when making Jones reagent you dissolve X amount of K2Cr2O7 in an equal amount of Conc. H2SO4.

How do you get that much K2Cr2O7 to go into that little H2SO4.

From what I know K2Cr2O7 only has a solubility in water of 4.9 gm/100ml.

Is K2Cr2O7 more soluble in H2SO4 than water?

Thanx for looking.

Jim
 
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In water, the chromate salt is sparingly protonated. In sulfuric acid, is chromic acid produced? If so, what is the solubility of chromic acid in sulfuric acid?
 
I understand what happens now.

Thank You
 

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