"Hmm. This was in a IVth Form chemistry course and the issue was a bout protesting against a limestone quarry, as raised by Mr Tyndall."
There's little point protesting about a limestone quarry. Limestone dust is virtually neither respirable or crystalline. Nothing is harmless (even water are toxic in excess) but there's a world of difference between RCS and limestone dust. That's before we get into the specifics of the dilution effect.
PS I did get an A in Chemistry A level in the sixties.
Pure limestone would be okay, but chalk has a fair bit of silica in it which certainly can be harmful.
"Hmm. This was in a IVth Form chemistry course and the issue was a bout protesting against a limestone quarry, as raised by Mr Tyndall."
There's little point protesting about a limestone quarry. Limestone dust is virtually neither respirable or crystalline. Nothing is harmless (even water are toxic in excess) but there's a world of difference between RCS and limestone dust. That's before we get into the specifics of the dilution effect.
PS I did get an A in Chemistry A level in the sixties.
And for people whose chemistry is a bit rusty - chalk is a form of limestone. It isn't called limestone in everyday language but it is primarily calcium carbonate so it counts.
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