[Lmn55d]

hi. I would probably checkraise this flop these days. The way you played it, I would checkraise the turn as there aren't many draws he could be raising with and if he has a king there aren't many scare cards for him. He's loose so he's probably not folding a king, his most likely holding.

EDIT: I realize you said he's loose and passive. If he's passive enough not to bet this flop if checked to (rare IMO) your flop bet is good, or if he is passive enough to call down with ace high but not after you checkraise it, flop bet also good.