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What is the concentration of hydrogen ions

in a solution containing 0.645 M HOCN
(cyanic acid) and 0.235 M (NaOCN) (sodium
cyanate)? The ionization constant of cyanic
acid is 3.5 × 10−4
.
Answer in units of M

2 answers

Use the HH equation, then convert pH to H^+.

i don't know how

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