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what is the ionic strength of a buffet that is made to be 0.0997 M NaH2PO4...

what is the ionic strength of a buffet that is made to be 0.0997 M NaH2PO4 and 0.1454 M K2HPO4? Express your anwser with 3 significant figures.

the anwser was 0.536 but im not sure how to get that
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