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If Ka for HCN Is 6

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If Ka for HCN is 6.2 10-10, what is Kb for CN-? If K<sub>a</sub> for HCN is 6.2 <font face= symbol ></font> 10<sup>-</sup><sup>10</sup>, what is K<sub>b</sub> for CN<sup>-</sup>?   A)  6.2 <font face= symbol ></font> 10<sup>-</sup><sup>24</sup> B)  6.2 <font face= symbol ></font> 10<sup>4</sup> C)  1.6 <font face= symbol ></font> 10<sup>-</sup><sup>5</sup> D)  1.6 <font face= symbol ></font> 10<sup>23</sup> E)  none of these


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