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The determination of the rates of attack of the hydroxides of first group metals on 790 vycor glass Colclough, John Reed

Abstract

1. The effect of concentration of alkali on the initial rate of attack of vitreous silica was measured at 80°C for LiOH, NaOH, KOH, RbOH and CsOH. Maximum rates of attack were observed at concentrations of 5 N for NaOH and 10 N for KOH. 2. The effect of temperature on rate of attack was measured in the range 60°C to 90°C for NaOH and from 70°C to 90°C for KOH. 3. For a given concentration, the order of a decreasing attack is NaOH, KOH, LiOH, RbOH and CsOH. 4. With 95% ethanol and 100% methanol as solvent for NaOH and KOH, the rate is nil. 5. With crystalline silica in aqueous alkali, the rate of attack is about 1/8 of vitreous silica.

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