How much ascorbate to neutralize one liter of chlorinated tap water? In Las Palmas de Gran Canaria, tap water is chlorinated. In an Internet forum, someone   claims that in 2008 the water had a chlorine concentration of 0,5 - 1mg/l. On the official site of Emalsa, the water provider, I couldn't find any information about chlorine concentration. I tried contacting them online, but the contact form is broken.

In another forum, I read that ascorbic acid (vitamin C) can be used to neutralize the chlorine: My taste buds say it works!

How much ascorbate/l do I need to neutralize the above amount of chlorine?
This is just a very short explanatory note on the article suggested by Greg E..

The reaction between ascorbic acid and hypochlorous acid is as follows:
$$ \ce{C5H5O5CH2OH + HOCl → C5H3O5CH2OH + HCl + H2O}$$
so for 1 mole of hypochlorous acid you need 1 mole of ascorbic acid. This can be recalculated into a mass ratio by the use of their molecular masses:

$$M(\ce{C5H5O5CH2OH})=176\;\text{g/mole}$$
$$M(\ce{HOCl})=52.5\;\text{g/mole}$$
From this we can see that if the molar ratio is $1:1$, the mass ratio is $176:52.5$ which is $3.3:1$ somewhat higher than the article claims. 

I am not exactly sure of the reason, it could be that there is some side reaction of ascorbic acid that also removes some additional hypochlorous acid although I wouldn't know which. Perhaps the article is talking about the amount of ascorbic acid you need to get a concentration which you don't taste anymore?