9/27/2023 0 Comments Ph 7.18![]() Where -5.13 < a HF < 1.60, -0.28 < pH < 7.18 and 25 < T < 70 ☌.Īn examination of the empirical rate laws suggests that the rate-determining step in the reaction mechanism involves a coordinated attack of HF and H⁺ on the Si-O bond where the H⁺ ion, acting as a Lewis acid, attacks the bridging O atom, while the F end of a HF molecule, acting as a Lewis base, attacks the Si atom. Similarly, 97 amorphous silica dissolution rate data from published studies were analyzed using multiple linear regression to develop an empirical rate law for amorphous silica ![]() Quartz dissolution rate data from other published studies were combined with the rate data from my experiments and these 75 data were analyzed using multiple linear regression to produce an empirical rate law for quartz I performed 57 batch reactor experiments in acidic fluoride solutions to measure the dissolution rate of quartz. The dissolution of silica and glass by HF plays a very important role in technology and is widely used for the etching of silica and silicate glasses in the glass industry, in the flint industry, in surface micromachining, in etching of glass fibers for near-field optical probes, in the creation of frosted surfaces for decorative applications like frosted glass and cosmetic vials. ![]() Of particular importance are the interactions of silica with aqueous fluids because these fluids are present in nearly every natural setting. SiO₂ is the most abundant oxide in the earth and its properties, behaviors and interactions are of immense scientific and technological importance.
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