Contents
- 1 What Colour does cobalt chloride turn to in the presence of water?
- 2 Is adding water to cobalt chloride exothermic?
- 3 What is the formula for cobalt II chloride hydrate?
- 4 What color does cobalt chloride burn?
- 5 What happens when you add water to cobalt?
- 6 What happens when cobalt chloride is placed in cold water?
- 7 What is the equilibrium between cobalt and anhydrous cobalt?
What Colour does cobalt chloride turn to in the presence of water?
pink
You can get an indicator paper – like litmus paper but containing cobalt chloride – which changes colour from blue to pink in the presence of water.
Is adding water to cobalt chloride exothermic?
The cobalt chloride dihydrate is purple in color and cobalt chloride hexahydrate is pink in color. When the reaction is reversed by adding water, the blue solution of cobalt chloride changes to pink color and heat is evolved, therefore the reaction is exothermic.
Does temperature increase when water is added to cobalt chloride?
A change in temperature or concentration of the ions will shift the equilibrium. If heat is added, the equilibrium will shift towards the cobalt chloride complex, which is blue in color. Add water, however, and the equilibrium will shift back towards the pink hydrated species.
Why does adding water cause a color change?
If you add water, the equilibrium will shift to the left and the color will be pink. If you add HCl , which will increase the concentration of Cl− ions, the equilibrium will shift to the right and the color will be blue.
What is the formula for cobalt II chloride hydrate?
Cl2CoH2O
Cobalt(II) chloride hydrate | Cl2CoH2O – PubChem.
What color does cobalt chloride burn?
Cobalt(II) chloride imparts no color to a flame. No color is imparted to the flame by cobalt(II) chloride, but a large number of incandescent flashes shoot out with the stream of burning gas. Since these are white, they contain all colors of the visible spectrum, not the characteristic line spectrum of cobalt.
What happens when AgNO3 is added to cobalt chloride?
Addition of AgNO3 to the blue solution of CoCl4 2– results in the formation of a white precipitate of AgCl, via the reaction Ag+(aq) + Cl–(aq) → AgCl(s), and a pink solution of Co(H2O)6 2+. The effect of heat is explained by noting that reaction (1) is endothermic—heat is a reactant in the reac- tion equation.
What do you observe when cobalt chloride crystals are heated?
When pink crystals of cobalt (II) chloride are heated steam is given off and the colour of the solid changes to blue.
What happens when you add water to cobalt?
Dissolving cobalt(II) chloride in water makes the pink hydrage. The addition of HCl forms a blue chloride complex.
What happens when cobalt chloride is placed in cold water?
The tube placed in cold water will turn more pink. A change in temperature or concentration of the ions will shift the equilibrium. If heat is added, the equilibrium will shift towards the cobalt chloride complex, which is blue in color. Cooling will shift the products towards the hydrated complex, which is more pink.
How to make cobalt and HCl turn pink?
Description: Test tubes containing a pink solution of cobalt and chloride ions are placed in hot water and cold water. The tube placed in hot water will turn blue. The tube placed in cold water will turn more pink. 2 Pre-prepared test tubes with cobalt chloride and HCl (pink solutions)‡ in beaker
What kind of odor does cobalt chloride have?
Cobalt chloride is a pink to red solid with a slight sharp odor. Sinks and mixes with water. Pale blue leaflets, turns pink upon exposure to moist air.
What is the equilibrium between cobalt and anhydrous cobalt?
An equilibrium exists between a hydrated cobalt species and anhydrous cobalt chloride, both have an oxidation state of 2+. See the equilibrium below: A change in temperature or concentration of the ions will shift the equilibrium. If heat is added, the equilibrium will shift towards the cobalt chloride complex, which is blue in color.