Which of the following acids is used for etching glass?
Correct answer: C. Hydrofluoric Acid
- A. Hydrochloric Acid
- B. Nitric Acid
- C. Hydrofluoric Acid
- D. Sulphuric Acid
- E. Acetic Acid
Explanation
HF etching is capable of etching materials such as amorphous silicon dioxide; quartz and glass at very high etch rates. Since HF etching is a wet process, meaning that it uses chemicals, it creates an isotropic etch. This means that there are curved etched out sections under the etching mask.
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About Acids, Bases and Salts
Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
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