Thread: sodium hydroxide and silica reaction

Alkali such as sodium hydroxide and silica reaction is ？
the product is what ？
Sticky products ？

Originally Posted by luna247

Alkali such as sodium hydroxide and silica reaction is ？
the product is what ？
Sticky products ？

Well, I suppose you can expect reactions such as SiO₂ + 2NaOH -> Na₂SiO₃ + H₂O, and similar ones with more complex silicate and hydroxy silicate anions, hence the sticky products.

Thanks a lot , I already know the answer：O型

Originally Posted by luna247

Thanks a lot , I already know the answer：O型

Then why ask?

Silica gel is also known as amorphous silicon dioxide with the chemical formula SiO2.It is used as a drying agent to absorb the moisture..it is not as harmful..

Originally Posted by shawn43

Silica gel is also known as amorphous silicon dioxide with the chemical formula SiO2.It is used as a drying agent to absorb the moisture..it is not as harmful..

Not as harmful as what?

Rest assured the contents of the packet, silica gel, is basically sand and it is not harmful if swallowed. However, caution should be taken to keep the product out of small children’s reach..

Not necessarily sticky.
In concrete technology, the alkali-aggregate reaction (AAR) is a well known reaction between the alkali content of the concrete, as sodium and potassium hydroxides, with reactive, strained quartz to form gels that expand and cause concrete to crack.
This reaction is a problem in various concrete situations, one of which is railway sleepers.