Are chocolate sour by nature?

I saw some 100% cocoa chocolate for baking. I bought a bar and found that it taste sour. It says no sugar added so I expect it not to be sweet. Without sweetener, do chocolate taste sour by nature?
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To me, unsweetened cocoa is one of the worse tasting things in the world. Totally awful. But I think some people like it. For me it must be sweetened. Jackie
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Jacqueline Davidson

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