I saw the word "speculation" is countable and non countable.
Here in this text "There is speculation in Israeli media that the announcement on homes is designed to help him bring Arab countries to a possible summit in the US."
if I swap "speculation" with "a speculation", will it be wrong ?
"

Question

I saw the word "speculation" is countable and non countable.
Here in this text "There is speculation in Israeli media that the announcement on homes is designed to help him bring Arab countries to a possible summit in the US." 
if I swap "speculation" with "a speculation", will it be wrong ?
"

Answer

I would say "there is speculation". It sounds more natural. And speculation is uncountable, so you would use "much".

I hope this helps.