sou ka na and sou ka


Is "sou ka na" roughly equal to "so ka" being "is that so?" and the difference
is that "sou ka na" conveys more emotions?




Not in the slightest. When you say そうか 'sou ka', you are saying something like
'I see' or 'Is that so?' You have understood what the other party is saying.
When you say そうかな, you say something like 'I doubt that' or 'Really?' You are
casting doubt on the other party's claims.

