3% Na+, i guess.

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Must I prove to you how good we are together?

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if i know that there is 3g of Na+ ions per 100g of biscuit for example then how do i find the concentration of the Na+ ions?  
-yes i know this is probably a stupid question.

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It's not Concentrated. XD It's not a game of playing Needle in the Hay Stack. It's dispersed throughout the entire 100g.

Of course, with a chemistry set, there's probably a way to extract it. But that way, I'm not aware of.

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"You keep using that word. I do not think it means
What you think it means." -Inigo Montoya