Properties of Potassium dichromate:
Physical properties:
1. It made orange red crystals that melt at 396°C.
2. It is fairly soluble in cold water and however freely soluble in hot water.Chemical properties:
1. Action of Heat:
On heating, K2Cr2O7 decomposes to provide potassium chromate with the evolution of O2 gas.
4K2Cr2O7 → 4K2CrO4 + 2Cr2O3 + 3O22. With Alkalies:
Whenever an alkali is added to an orange-red solution of K2Cr2O7, a yellow solution outcomes due to the formation of potassium chromate.
K2Cr2O7 + 2KOH → 2K2CrO4 + H2OOrange-red YellowOn acidifying the yellow color of K2CrO4 again alters to orange red due to the reformation of K2Cr2O7.
2K2CrO4 + H2SO4 → K2Cr2O7 + K2SO4 + H2O Orange redThe inter conversion is demonstrated on the basis of the fact that in K2Cr2O7 solution, orange red Cr2O72- ions are in symmetry with yellow CrO42- ions.
Cr2O72- + H2O ↔ 2CrO42- + 2H+Orange red Yellow3. Oxidising properties:
K2Cr2O7 is a powerful oxidising agent. In the presence of dilute H2SO4, one mole of this compound provides three atoms of oxygen as illustrated below.K2Cr2O7 + 4 dil.H2SO4 → K2SO4 + Cr2(SO4)3 + 4H2O + 3(O)4. Chromyl chloride test:
Whenever salt having chloride is treated with K2Cr2O7 and concentrated H2SO4 reddish brown vapors of chromyl chloride are acquired.
K2Cr2O7 + 4KCl + 6H2SO4 → 2CrO2Cl2 + 6 KHSO4 + 3H2O ChromylchlorideThis reaction is utilized in the detection of chloride ions in qualitative analysis.
Latest technology based Chemistry Online Tutoring Assistance
Tutors, at the www.tutorsglobe.com, take pledge to provide full satisfaction and assurance in D Block Elements homework help via online tutoring. Students are getting 100% satisfaction by online tutors across the globe. Here you can get homework help for D Block Elements, project ideas and tutorials. We provide email based D Block Elements homework help. You can join us to ask queries 24x7 with live, experienced and qualified online tutors specialized in D Block Elements. Through Online Tutoring, you would be able to complete your homework or assignments at your home. Tutors at the TutorsGlobe are committed to provide the best quality online tutoring assistance for Inorganic-Chemistry Homework Help and assignment help services. They use their experience, as they have solved thousands of the Chemistry assignments, which may help you to solve your complex issues of D Block Elements. TutorsGlobe assure for the best quality compliance to your homework. Compromise with quality is not in our dictionary. If we feel that we are not able to provide the homework help as per the deadline or given instruction by the student, we refund the money of the student without any delay.
tutorsglobe.com state preferences assignment help-homework help by online choice under uncertainty tutors
www.tutorsglobe.com offers functional group reactions of electrophilic additions, addition reactions of alkenes, homework help, assignment help, online tutoring assistance, organic chemistry solutions by online qualified tutor's help.
Feeding Relationships in Ecology tutorial all along with the key concepts of Autotrophs and Heterotrophs, Trophic Levels, Food Chain, Food webs and Ecological Pyramids
Carbon NMR tutorial all along with the key concepts of 13C-NMR Spectra, Interpretation of 13C-NMR Spectra, Examples of 13C-NMR Spectra Interpretation and 13C Spectrum of Alanine
tutorsglobe.com working capital forecasts assignment help-homework help by online working capital management tutors
Enthalpy changes tutorial all along with the key concepts of Enthalpy and enthalpy changes, Relationship between CP and CV of an ideal gas, Adiabatic expansion and Joule-Thomson effect
theory and lecture notes of market structure all along with the key concepts of monopolistic competition, product differentiation, preference specification, monopolistic competition equilibrium, determinants of mc equilibrium. tutorsglobe offers homework help, assignment help and tutor’s assistance on market structure.
Theory and lecture notes of Effects of Deficits all along with the key concepts of effects of deficits, Open-Economy Effects, Short Run Consequences, Political Consequences. Tutorsglobe offers homework help, assignment help and tutor’s assistance on effects of deficits.
tutorsglobe.com skin assignment help-homework help by online receptor organs tutors
alkaline earth metals tutorial all along with the key concepts of extraction of alkaline earth metals, uses of alkaline earth metals, physical properties, solubility, lattice energy and hydration energy
Phylum Echinodermata tutorial all along with the key concepts of Diversity of echinoderms, Echinoderm organization, Locomotion in Phylum Echinodermata, Feeding and digestion in Phylum Echinodermata, Nervous system and sense organs, significance of echinoderms
Theory and lecture notes of Real Zeros of Polynomial Functions all along with the key concepts of Long Division of Polynomials, Remainder Theorem, Synthetic Division, Descartes' Rule of Signs, Rational Root Test, Upper and Lower Bounds. Tutorsglobe offers homework help, assignment help and tutor’s assistance on Real Zeros of Polynomial Functions.
www.tutorsglobe.com offers Correlation and Regression homework help, Correlation and Regression assignment help, online tutoring assistance, math solutions by online qualified tutor's help.
tutorsglobe.com food microbiology assignment help-homework help by online environmental, food and industrial microbiology tutors
properties of amino acids tutorial all along with the key concepts of physical properties of amino acids, optical activity of amino acids, absorption of light by amino acids, acid-base property of amino acids and titration curve of simple amino acids
1938365
Questions Asked
3689
Tutors
1491060
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!