Alas for poor Johnny,
For Johnny is no more,
For what he thought was H20
Was H2SO4

But quickly up stepped Johhny's Dad,
A Chemist, bright, was he,
He swiftly dosed his young son up
With CaCO3

I regret that I can't remember the last verse in which Jonny explodes (from generatd gas).

Regards

Walrus