Question

describe the reaction of silica with HF and NaOH​

Answer 1

Answer:

When Silicia react with HF: SiF4 will be created

When Silicia react with NaOH it will produce Na2SiO3 and H2O

Explanation:

1. SiF4 gas will appear and take in consideration that SiF4 is toxic and corrosive. In moist air it fumes, whereby it is easily hydrolyzed to give H2SiF6 and SiO2. However, in my opinion the most toxic / hazardous substance in this system is certainly HF. Utmost care must be exercised when working with HF, especially if it is a concentrated solution (40%) or even anhydrous. It easily penetrates the skin and can lead to serious injuries.
2. Sodium hydroxide react with silicon dioxide to produce sodium silicate and water. This reaction takes place at a temperature of 900-1000°C.