I did provide a link where both the British and the American pronunciation treat the c as an s sound. They have the IPA as /əˌsəʊ.siˈeɪ.ʃən/ for both dialects. “soc” does contain the c, not the t.
As I said, I’m not debating that the t in “tion” is pronounced that way (at least I tried to be clear, maybe I muddled it even more), but I have always pronounced the c as an s sound, and it appears Cambridge agrees with me.


I pronounce it the same as other people here: “sock-urh”. I was just confused about the “association” thing, so thanks for clearing that up!