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Originally Posted by Snadger  Yep it's a plastic cube in a frame  and yes it's a galvanised watering can.  Might try using my plastic can today!
PS Just had a thought.........it's rainwater not tap water so shouldn't be hard water? |
If not hard water (and rain shouldn't be, might be acid in its own right<g>), it must be the galvanised can.......Acid can react either with the carbonates in hard water, or with the zinc on a galvanised container. Both will fizz. Thinking about it, the acid in acid rain might be more likely to react with metal (especially galvanising) than citric acid. Too long since my chemistry A level to be sure (and we didn't do much about organic acids and metals) but acid rain contains very dilute sulphuric doesn't it? Maybe the citric acid traces just... encouraged it?