The scale formation in a kinetic used for boiling water is caused by the presence in water of?

CRIMHAZ

3 years ago

Myschool pls don't be confused

Calcium hydrogencarbonate is unstable when heated and decomposes to give solid calcium carbonate. This explains why temporary hardness is removed by boiling and the formation of 'scale' in kettles and boilers

So d correct and is opt B

Olamide43514

2 years ago

The scale formation in a kettle used for boiling water is primarily caused by the presence of calcium hydrogen carbonate \((\text{Ca(HCO}_3)_2)\) in the water. When water containing calcium hydrogen carbonate is heated, it decomposes to form calcium carbonate \((\text{CaCO}_3)\), which precipitates out of the solution and forms scale.

The relevant reaction is:
\[ \text{Ca(HCO}_3)_2 \rightarrow \text{CaCO}_3 + \text{CO}_2 + \text{H}_2\text{O} \]

Thus, the correct answer is:

C. calcium hydrogen carbonate

Amiokhani

10 years ago

no answer.......is d deposition of calcium trioxocarbonate(iv)

marlianlawa

2 years ago

When water containing dissolved calcium carbonate is heated, the carbonate ions combine with calcium ions to form insoluble calcium carbonate. This calcium carbonate then sticks to the surface of the kettle, forming a layer of scale.

badformular

10 years ago

pls ansa is c

Etugo

10 years ago

Temporary water is due to the presence of CaHCO3 which decompose into CaCO3 :-)... it's C

Myschool Kelly

10 years ago

Thanks for your contribution. Correction has been made.

marlianlawa

2 years ago

When water containing dissolved calcium carbonate is heated, the carbonate ions combine with calcium ions to form insoluble calcium carbonate. This calcium carbonate then sticks to the surface of the kettle, forming a layer of scale.

The answer is B.