What was the common language of Medieval west Africa was what ?

Question

Due to the infulence of the Muslim traders what was the common language of Medival West Africa was ?

Answer 1

I'm not sure why you assume that the influence of the muslim traders also led to a creation of a common language for mediaval 'west africa', or indeed, at any period in west african history.

The muslim traders conducted business in Arabic, and, perhaps, more times, in Hausa/Fulani languages. The muslim traders from the North did not impose languages on the tribes they traded with. They succeeded in bringing religion through conquest and conversion.

As you know, the Q'uoran is in Arabic and converts learned to communicate in that language. I believe the Hausa/Fulani languages prevailed however and both languages are presently still spoken by a predominant number of tribes from the North of Nigeria to Mali's interiors and elsewhere.

There is no monolithic entity known as medieval west africa with any single characteristic of nationality. The tribes have always stayed largely autonomous with certain predominance of empires rising and falling successively.