‘Acidity’ of Quartz

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WHEN quartz powder, obtained by finely grinding pure Brazilian pebble, is put into neutral water the pH is rapidly lowered to about 6.4. This acidity has been attributed to silicic acid, but such an explanation seems unlikely for the following reasons.

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VAN PRAAGH, G. ‘Acidity’ of Quartz. Nature 143, 1068 (1939) doi:10.1038/1431068a0

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