Is the dehydration and hydration of CuSO4 5h2o reversible?

Asked By: Astou Pancho | Last Updated: 6th March, 2020
Category: science chemistry
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The chemical formula of a typical hydrated compound, such as copper(II) sulfate pentahydrate, is written as CuSO45H2O. The dot in the formula indicates that the two compounds are bound together. Upon heating, the water can be evaporated leaving an anhydrous salt. This process is reversible.

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Subsequently, one may also ask, is dehydration of a hydrate reversible?

The water molecules in a hydrate crystal can be removed by heating. In this dehydration reaction the crystal structure of the solid will change slightly and the color of the solid salt may also change. Decomposition is irreversible dehydration.

Similarly, why is CuSO4 5h2o considered a hydrate? The reason that CuSO4. 5H20 is considered a 'Hydrate', or more accurately a 'pentahydrate' is due to these water molecules that are integrated into the crsytals in the hydrated form.

In respect to this, is the dehydration of CuSO4 5h2o a physical or chemical change?

Dehydration of hydrates is considered to be a chemical change. The water molecules are trapped in the crystal structure of the copper ii sulphate, and there are always five of them per formula unit; this gives the compound a reliable formula, and allows stoichiometric calculations to be made.

How do you separate water from a hydrate?

Experimentally measuring the percent water in a hydrate involves first heating a known mass of the hydrate to remove the waters of hydration and then measuring the mass of the anhydrate remaining.

39 Related Question Answers Found

Why is CuSO4 blue?

In hydrated CuSO4 the water molecules surrounding the Central metal (Cu) function as ligands which bring d-d transition and hence emits blue colour in visible region due which hydrated CuSO4 appears blue and as anhydrous CuSO4 doesn't have any water of crystallisation hence remains white in colour.

What happens when you add water to anhydrous CuSO4?

What happens if a drop of water is poured over anhydrous copper sulphate? Visually, some of the white copper sulphate will turn blue. Chemically, the copper sulphate crystal would absorb the water molecules in a ratio of 5 water molecules per copper sulphate unit.

Are the dehydration and hydration of the three salts used in the experiment reversible?

Answer Expert Verified
The answer to this question is true, the dehydration and hydration of salts are reversible. This salt has an anhydrous/dry and hydrous/wet form called hexahydrate. The dry form is blue but the wet form is purple. If you put water on the anhydrous form it will become purple.

How do you prepare hydrated copper sulphate?

Preparation of Pure, Dry Hydrated Copper (II) Sulfate Crystals
  1. Add dilute sulfuric acid into a beaker and heat using a bunsen burner flame.
  2. Add copper (II) oxide (insoluble base), a little at a time to the warm dilute sulfuric acid and stir until the copper (II) oxide is in excess (stops disappearing)

What happens if you overheat a hydrate?


If you don't heat the hydrate enough, you won't get all the water to evaporate, which means the final product will still contain some water. When you overheat the hydrate, you drive off all the water, but lose some of the anhydrous CuSO4 , which breaks down to form copper (II) oxide.

What happens when hydrated CuSO4 is heated?

When the hydrated salt (CuSO4. 5H2O ) is heated, it loses its water of crystallisation and becomes anhydrous salts (without water of crystallisation). The blue colour of CuSO4 is due to the presence of water of crystallisation. Hence, when it loses its water of crystallisation, the solution becomes colourless.

What is CuSO4 made up of?

Copper sulfate commonly refers to copper (II) sulfate or cupric sulfate. This chemical compound is made up of two ions- a copper (II) ion and sulfate ion. Copper (II) ion or cupric ion is denoted by Cu2+ and sulfate ion has an ionic formula of SO4^2-. The overall ionic formula of copper (II) sulfate is CuSO4.

Is adding water to copper sulfate a chemical change?


Dissolution of unhydrous CuSO4 (white amorphous powder) in water will form complex ion [Cu(H2O)6]^2+, and sulfate anion. It should be counted as a chemical change. There is no chemical bond change. So it is a physical change.

Is CuSO4 an Efflorescent?

A mole of CuSO4•5H2O contains 5 moles of water (which corresponds to 90 grams of water) as part of its structure. A few hydrated compounds lose water spontaneously to the atmosphere upon standing. Such compounds are called efflorescent. All hydrated compounds may be dehydrated by heating.

Is hydration a chemical reaction?

In chemistry, a hydration reaction is a chemical reaction in which a substance combines with water. In organic chemistry, water is added to an unsaturated substrate, which is usually an alkene or an alkyne. This type of reaction is employed industrially to produce ethanol, isopropanol, and 2-butanol.

Is mixing NaCl and AgNO3 a chemical change?

For example, when an aqueous solution of silver nitrate (AgNO3) is added to the aqueous solution of sodium chloride (NaCl), a white precipitate of silver chloride (AgCl) is formed that is indicated by the following chemical reaction. After all, only ions, not compounds, are involved in the reaction.

What type of reaction is CuSO4 5h2o?

Type of Reactions Lab Answers
Reaction Balanced Chemical Reaction Type of Chemical Reaction
CuSO4(s) + H2O(l) → CuSO4*5H2O(s) CuSO4(s) + 5H2O(l) → CuSO4*5H2O(s) Synthesis
Ca(s) + S(s) → CaS(s) Ca(s) + S(s) → CaS(s) Synthesis
Mg(s) + O2(g) → MgO(s) 2Mg(s) + O2(g) → 2MgO(s) Synthesis

Why does CuSO4 turn white when heated?


Hydrated Copper Sulphate crystals [CuSO4. 5H2O] are blue in colour. When copper sulphate crystals are heated strongly, they loose all the water of crystallization and form anhydrous copper sulphate [which is white in colour]. The water of crystallisation gives the crystals of their salts their shape and colour.

How do you make CuSO4 5h2o?

Prepare a 1% copper sulfate solution. To make this solution, weigh 1 gram of copper sulfate (CuSO4 ·5H2O), dissolve in a small amount of distilled water in a 100 ml volumetric flask and bring to volume. Label this as 1% copper sulfate solution.

What color is copper chloride hydrate when heated?

Because of excess HCl, my copper(II) chloride hydrate is more green than blue. When it is heated gently, it turns brown and releases both water vapor and white fumes, showing that the excess HCl and the water have been released from the crystal structure.