2 things to correct: 1 i'm sure about, the other I'm pretty sure about
The one which I'm sure about is that the rain water obtains the compounds and the water in general obtains these compounds by running over rock containing these compounds (e.g. Chalk)
The one which I'm pretty sure about is that Breweries are set up in soft water regions :).
Question 7 is wrong as it doesn't matter if hard water doesn't corrode lead pipes as we don't even use lead pipes for transporting water as lead is POISONOUS!!!
Amendment: question 7, hard water forms a scale the insides of pipes, stopping poisonous ions such as lead from getting into drinking water. It also stops iron pipes from rusting.
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