how does one pronounce ch in spanish? ;/
From what I heard it can be 'ch' or 'tch', depending on region (and other factors?).
FYI, here (in the general discussion section, called Duolingo or General) your post will be quickly lost in the enormous amount of posts so, to have more answers/explanations to your question, it would have been better to post it in the Spanish Discussion section.
When you create a new discussion, there is a drop-down menu on the top, change from the default value "Duolingo" (which corresponds to this general discussion page) for the specific one (Spanish, in your case). But you can change it now, it's not too late : edit your original post then select the Spanish forum.