Copper

chemical compound

Copper_sulfate.jpg
Copper(II)-sulfate-pentahydrate-xtal-1985-Cu-coord-3D-bs-17.png
Copper(II)-sulfate-pentahydrate-unit-cell-1985-3D-bs-17.png
Copper(II) sulfate is an inorganic compound with the chemical formula · CuSO4. It forms hydrates · CuSO4·nH2O, where n can range from 1 to 7. The pentahydrate (n = 5), a bright … Wikipedia
Factsheet
Names IUPAC name
Copper(II) sulfate
Identifiers
CAS Number 7758-98-7 (anhydrous) Y
7758-99-8 (pentahydrate) Y
16448-28-5 (trihydrate) N
19086-18-1 (heptahydrate) N
Factsheet
Names IUPAC name
Copper(II) sulfate
Identifiers
CAS Number 7758-98-7 (anhydrous) Y
7758-99-8 (pentahydrate) Y
16448-28-5 (trihydrate) N
19086-18-1 (heptahydrate) N
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Wikipedia
en.wikipedia.org › wiki › Copper(II)_sulfate
Copper(II) sulfate - Wikipedia
December 6, 2025 - The pentahydrate form, which is ... When water is then added to the anhydrous compound, it turns back into the pentahydrate form, regaining its blue color. Copper(II) sulfate pentahydrate can easily be produced by crystallization from solution as copper(II) sulfate, which ...
Preparation and occurrence
Chemical properties
Uses
Other forms of copper sulfate
Toxicological effects
Bibliography
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Testbook
testbook.com › home › general science › chemistry
[Solved] What is the colour of copper sulphate?
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"Option 4 is correct, i.e. Blue. Key Points Copper sulphate-   Another name for Copper sulphate is Blue Vitriol. The number of water molecules in the Copper Sulphate solution is 5. The chemical formula for Copper Sulphate in its hydrated form is CuSo4. 5H2O. Water is present in the form of crystals in Copper Sulphate. It is IUPAC name is Copper Sulphate Pentahydrate. An aqueous solution of copper sulphate turns blue litmus red as it is acidic in nature. Litmus paper is made by an extract of the line plant. Extra facts:     Name of Indicator Colour of the Indicator Colour in Acid medium Colour in alkali medium Litmus paper Blue Red Blue (Remain Same) Litmus paper Red Red (Remain Same) Blue Methyl orange Orange Red Yellow Phenolphthalein Colourless Colourless Pink"
Videos
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Color of Copper (II) sulfate [hydrous and anhydrous] - YouTube
February 22, 2022
00:23
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Copper Sulfate Colour Change (reaction only) - YouTube
August 20, 2012
05:15
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How to Prepare a Standard Solution of Copper(II) Sulfate - YouTube
October 14, 2024
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02:19
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Crystals of copper sulphate contain water of crystallization - YouTube
June 16, 2022
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Why does the colour of copper sulphate solution change when ...
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Give reason why? The blue colour of the Copper sulphate ...
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Doubtnut
doubtnut.com › qna › 646550644
What is the colour of copper sulphate ?
Copper sulphate solution is Blue in colour. However, the solid may be white or blue. The white form of copper sulphate powder is the dehydrated form, which contains no water. The hydrated form of copper sulphate powder is blue in colour.
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Quora
quora.com › What-is-the-color-of-the-copper-sulphate-solution
What is the color of the copper sulphate solution? - Quora
Answer (1 of 12): Copper(II)Sulphate is blue in colour in presence of water of crystallization (image source- google) The one on the left side is copper Sulphate with water of crystallization (CuSO4.5H2O) and on the right is anhydrous copper sulphate (CuSO4) .5H2O in the blue copper sulphate i...
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ChemicalBook
chemicalbook.com › article › chemical-properties-and-color-changes-of-copper-sulfate.htm
Chemical properties and color changes of copper sulfate_Chemicalbook
Anhydrous copper (II) sulfate is white and only turns blue when it comes into contact with water molecules. Copper sulphate pentahydrate is the most prevalent form, with the chemical formula CuSO4.5H2O.
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ECHEMI
echemi.com › home › news › faq › why is copper sulfate blue and it properties
Why is copper sulfate blue and it properties - ECHEMI.com
July 27, 2022 - The truth about copper sulfate is that there are several compounds that make up the molecule and therefore gives it its blue color, such as copper ion, sulfur and hydrogen peroxide.
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Quora
quora.com › What-is-the-colour-of-CuSO4
What is the colour of CuSO4? - Quora
Answer (1 of 34): CuSo_4 is also known as anhydrous copper sulphate and it is white in color. Anhydrous copper sulphate absorb moisture and form CuSo_4.5H_2O which is blue in color.
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Vedantu
vedantu.com › question-answer › blue-color-of-copper-sulfate-solution-in-water-class-12-chemistry-cbse-5f4d22c5d1fa823ca526e824
Why the blue color of copper sulfate solution in water class 12 chemistry CBSE
June 21, 2024 - Why the blue color of copper sulfate solution in water changes to yellow when treated with concentrated hydrochloric acid
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Unacademy
unacademy.com › question & answer › chemistry questions › why does the colour of copper sulphate change when an iron nail is kept in it?
Why does the colour of Copper Sulphate change when an iron nail is kept in it?
February 28, 2023 - When an iron nail is dipped in copper sulphate solution originally in blue colour, the surface of the iron develops a brown copper coating, and the colour of the copper sulphate solution changes from blue to pale green as the iron is dissolved ...
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Filo
askfilo.com › cbse › smart solutions › the colour of copper sulphate solution
The colour of copper sulphate solution... | Filo
January 17, 2025 - Copper sulfate solution is known for its distinctive blue color.
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Doubtnut
doubtnut.com › class 10 › chemistry
Why does blue colour of copper sulphate solution start fading when a zinc rod is dipped in it?
To understand why the blue color ... the Components - Copper Sulfate Solution: The solution is blue in color due to the presence of copper ions (Cu²⁺). - Zinc Rod: Zinc is a more reactive metal compared to cop...
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KnowledgeBoat
knowledgeboat.com › question › select-the-correct-answer-colour-of-an-aqueous-solution-of--585760232869899100
The colour of an aqueous solution of copper sulphate is: | KnowledgeBoat
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Blue Reason Aqueous solution of copper sulphate is blue.
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Homework.Study.com
homework.study.com › explanation › what-color-is-a-copper-sulphate-solution.html
What color is a copper sulphate solution? | Homework.Study.com
Copper sulphate and sodium carbonate react with glucose to form a brick-red precipitate. Write the ionic equation for this reaction. ... Calculate the amount, in g, of copper sulfate produced when 10g of copper oxide is reacted with 20mL of 0.5M of sulfuric acid. CuO+H2SO4 \rightarrow CuSO4+H2O. Describe how a spectrophotometer measures the absorbance of a coloured solution.
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Reddit
reddit.com › r/chemistry › why is the pentahydrate of copper sulfate blue?
r/chemistry on Reddit: Why is the Pentahydrate of Copper sulfate blue?
December 20, 2022 -

I'm a highschool student and we had a lab experiment about hydrates. The teacher noted that we need to explain in the Lab report about the blue color of the Copper sulfate pentahydrate.

After some research the only thing I got is that when Anhydrous copper sulfate is a white powder which I already knew and that when you add water to the white powder it returns to it's hydrated state. My question is why whenever water is mixed into the Copper sulfate structure it becomes blue and when none is mixed it is white.

Top answer
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Because electron levels change when we add ligands to metal. The energy difference correlates with wavelength and so on. Hydrated copper ion absorbs red, anhydrous cuso4 has no absorbance in visible area.
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Have you learned about s, p and d orbitals? Crystal Field Theory is a simple model that can explain why many transition metal complexes have nice colors.
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Science Forums
scienceforums.net › home › sciences › chemistry › problem with my cuso4 solution
Problem with my CuSO4 solution - Chemistry - Science Forums
August 20, 2009 - As we know, the colour of a CuSO4 solution is light blue, I got a green colour in my cuSO4 solution. I suspect that some impurities may have mixed but when i re crystaly it, normal CuSo4 crystels formed. Any ideas?
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Vedantu
vedantu.com › question-answer › aqueous-copper-sulphate-solution-blue-in-colour-class-11-chemistry-cbse-5f626a8996466665ae05aa16
Aqueous copper sulphate solution blue in colour gives class 11 chemistry CBSE
December 20, 2025 - Aqueous copper sulphate soluti... ... Hint: Copper sulphate is a chemical compound composed from the elements copper, sulphur and oxygen. It is used as fungicide and herbicide in agriculture and non agricultural fields. Copper sulphate is blue in aqueous form.
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BYJUS
byjus.com › chemistry › cuso4
Copper Sulfate (CuSO4)
October 14, 2020 - In hydrated CuSO4, the water molecules surrounding the Central Metal (Cu) act as ligands resulting in d-d transition and therefore emitting blue colour in the visible region due to which hydrated CuSO4 appears blue.
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Filo
askfilo.com › cbse › smart solutions › what is the colour of copper sulphate solution? (a) green (b)
What is the colour of copper sulphate solution? (A) Green (B) Blue (C) Y..
September 25, 2025 - The color of copper sulphate solution is (B) Blue.
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Teachoo
teachoo.com › 12850 › 3497 › Question-1-Page-13 › category › Questions-from-inside-the-book
Why does the colour of copper sulphate solution change when an iron
June 30, 2021 - When a piece of iron nail is placed in Copper Sulphate solution, ... Hence, the colour of the solution turns from blue to transparent , because Fe displaces Cu from CuSO 4 (Copper Sulphate) to form FeSO 4 (Ferrous sulphate) , which is transparent.
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ScienceDirect
sciencedirect.com › topics › engineering › copper-sulfate
Copper Sulfate - an overview | ScienceDirect Topics
This method is simple and reasonably specific as it depends on the reaction of copper(II) with four N atoms in the peptide bonds of proteins. Compounds containing peptide bonds give a characteristic purple colour when treated in alkaline solution with copper sulfate.