African Dwarf Frog

[Annaconda]

I have a ph of 6.8, and I wanna raise it since I read that african dwarf frogs like a higher ph. Ive raised ph before by using baking soda in my goldfish tank, Is baking soda okay ? Im only asking because Ive heard that there very senstive to things. And I wouldnt want the baking soda to hurt them.
Thanks.
Ann