[Mesorah] Eka vs. Echa suffixes‏

[Danny Levy via Mesorah]

Why do V'odeka and Arom'meka in Hallel (Tehillim 118:28) have a dagesh in
the final kaf, while Vaychon'necha in Ha'azinu (32:6) and Ya'asfecha in the
haftara of Yom Kippur (Yeshaya 58:8) do not?

Similarly in Birkat Kohanim why is V'yishm'recha without a dagesh and
Vichuneka with a dagesh?

Is there a rule that explains all or most of these forms?

Danny Levy
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