How can I figure out the parent acid or base of a salt?

Below is the actual question I need answered, but I also want to know how to figure out what is the parent acid or base of any compound.



Each of the following compounds are dissolved in pure water. Which will change the pH of the resulting solution? List all that apply.

MgF2

KHCO3

KCN

NaCl

MgCl2How can I figure out the parent acid or base of a salt?
You use ACID + BASE = SALT + WATER



Look at formula .. first bit [metal] relates to base eg MgF2 ... base Mg(OH)2



Second part relates to acid .. basically H in front eg HF, HCN, H2CO3 etc



Only salts of strong acids and strong bases don't affect pH eg NaCl in this set.

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