Will having concrete rainwater tanks effect the ph of the water?

Question

I measured the water (because we keep fish) and got a ph of 7.6.

Would pure rainwater normally be nuetral?

We have a painted concrete tile roof and concrete tanks although both would be 20+ years old. Could stuff be leaching out which would effect the quality of the water?

I live in Australia BTW on the outskirts of a city.

Answer 1

acid rain affects ph

Answer 2

"Pure" rain, even in the absence of acid pollution, is slightly acidic. Concrete contains lime, which would counteract this, and raise the pH.

Answer 3

depends where u live if your in the bush away from pollution it's fairly pure not far from distilled water. If there is any sulphur dioxide in the air this produces H2S03 ( acid rain). Concrete tanks walls  will react with acid rain to produce Ca S03 & H2C02 ( soda water)