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![\large {\boxed {\bold {Ka \: = \: \frac {[H ^ +] [A ^ -]} {[HA]}}}}](/tpl/images/0858/5891/560b5.png)
![\tt Ka=\dfrac{[H_3O^+][CN^-]}{[HCN^-]}](/tpl/images/0858/5891/535c0.png)
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15) What is the hydronium ion concentration [H3O + ] of a 0.125 M hydrocyanic acid solution with Ka...
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