It's OK to ask on chat but you should not expect an answer (although you may get one anyway).
The Q&A site is designed for asynchronous help, you ask a question and it stays visible and can be answered by anyone at any time that they feel convenient.
If you ask in chat then although the archives are available, the default site mechanics will mean that ...
What changed is that we started using imgur thumbnails by default in chat; so when you link to http://i.stack.imgur.com/iSQFI.png, we display http://i.stack.imgur.com/iSQFIm.png, but link to the original:
<a rel="nofollow" href="//i.stack.imgur.com/DmZBd.png">
<img src="//i.stack.imgur.com/DmZBdm.png" class="user-image" alt="user image">
From the Chat FAQ:
Rooms will exist indefinitely, so long as there is at least one person
actively talking in the room. A room is considered worth retaining if
it has more than 15 messages by at least 2 users.
Rooms not worth retaining which are inactive for 7 days will be
deleted. Rooms worth retaining which are inactive for 14 days will be
You're should feel free to use the platform the way you choose, whether it's for chatting about ducks, or whether it's asking questions. Those who are here to help will do exactly that. Others might be inclined to request you ask it on the main site (perhaps with the intention of answering it and receiving the accompanying reward).
I've often been able to ...
There was a time when active community members felt the number of unanswered questions was growing too rapidly. Perhaps the community seemed more inclined to focus on a steady stream of new, answerable questions than to worry and/or deal with questions that may be out-of-scope or lack too much detail.
The result was a scheduled time when everyone can join ...
If the other discussions are about ducks or food, please interfere! You'll make David happy!
However, I'd do as you described; in chat, it is better to ask:
simple things that on the main site would be answered in comments
something too specific for your problem and that wouldn't probably interest anyone else
things that need some interaction, which is ...
I have found this before as well - difficulty logging into chat, even from the full site from my laptop. The way I circumvent this issue with logging into TeX, LaTeX and Friends is to log into the main Stack Exchange first, and then going to the chat room of your choice.
Start out by clicking on the chat link at the bottom of the mobile site:
You should ...