Cindy K. answered 03/15/19
Top 1% Tutor: Patient & Experienced Guide for Adult Learners
There are several very helpful spelling and pronunciation rules that are often omitted in formal language instruction.
One such rule is that C softens to /s/ when followed by E, I, or Y. Otherwise C says /k/.
Silent final E has many roles beyond the one it is most famous for, which is making the vowel say its name. However, that only explains about half of silent final E words. For example, in DANCE and PRINCE, the A and I are short. So why do they have a silent final E? The E is there to make each C soften to /s/. Otherwise the words would say /dank/ and /prink/.
The rule for C softening also explains why picnic + ing gets a K to form picnicking. Without the K, the C would be next to an I and would have to soften to /picnising/.
As you can see, a single simple rule can explain so many mysteries of English. While is English is often characterized as being full of exceptions, it is really a deliciously rich and robust code.