Dear Valeriya,

Typically, this reaction occurs at elevated temperatures, around 1300 to 1500°C, and at atmospheric pressure. Keep in mind that the actual conditions may vary based on the intended application or experimental setup.

The reaction you've mentioned is a chemical reaction between calcium hydroxide (Ca(OH)2) and silicon dioxide (SiO2) to produce calcium silicate (CaSiO3) and water (H2O). This reaction is often referred to as a cementation reaction and is an important part of the cement manufacturing process.

However, the temperature and pressure conditions for this reaction can vary depending on the specific context and the intended application. In industrial settings, this reaction is typically carried out at elevated temperatures and pressures to accelerate the reaction rate and improve the efficiency of cement production.

Typically, cement production involves heating a mixture of calcium carbonate (CaCO3), silica (SiO2), alumina (Al2O3), and iron oxide (Fe2O3) to temperatures around 1450°C (2642°F) in a kiln. This high temperature promotes the reaction between calcium oxide (CaO) derived from the decomposition of calcium carbonate and silica from the other components, forming calcium silicates including CaSiO3.

The pressure conditions for cement production are generally atmospheric pressure, as the reactions occur in open kilns.

It's worth noting that in laboratory settings or under specific conditions, the reaction might be studied at different temperatures and pressures to understand its kinetics and thermodynamics. If you have a particular context in mind, providing more details could help in giving a more precise answer.