Thank you very much, Faust's Accomplice.
Your answer is a little beyond me (the G#-Ab part). It has become all too obvious to me that I must study music theory. I have a book, but I've been lazy about it. If I studied it I wouldn't be asking dumb questions. So, I'd better get cracking.
For the turn, I will listen to the recording from our Sheet Music site, with your answer and the sheet music in hand. Then, I'll try to work it out on the keyboard. I am ashamed to ask, but...G## would be A?
The fingering...
I was hoping you'd say what you did. I know nothing about Chopin, and wondered if with his music, absolutely everything must be just so. Thank God, for the latitude. I need it.
One pleasant surprise in all this...
When I came to the ending, I thought at first I'd never get those last three chords right. But then I broke it down for LH and RH. It seems that the Left Hand's easy, if you just play B-B, then B-F#-B, then E-E, and let the Right Hand do the heavy lifting.
I laughed out loud at my first look at these chords, especially the slurs, telling me "Legato!" At first blush it seemed utterly impossible. But with a little effort, I am now able to play the three of them smoothly. Well, n-n-n-nearly, anyway.
I'll get there.
Thanks, once again, FA.