Kb for CN− and Ka for NH4+. Enter the Kb value for CN− followed by the Ka value for NH4+, separated by a comma, using two significa?

NetherCraft 0

Given that

Ka for HCN is 4.9×10−10 and

Kb for NH3 is 1.8×10−5,

calculate

Kb for CN− and

Ka for NH4+.

Enter the Kb value for CN− followed by the Ka value for NH4+, separated by a comma, using two significant figures.

4 Answers

  • Divide the numbers given into 1 x 10^-14 for your answers.

  • So, Ka * Kb = Kw

    Kw= 1.0 *10^-14

    and you are given either ka or kb…so its just algebra from there

    (Kw) / Ka

    ( 1.0* 10^-14) / ( 4.9 *10^-10) = 2.04 *10^-5

    Kw/Kb

    (1.0*10^-14) / ( 1.8 * 10^-5 ) = 5.55555 * 10 ^ -10

  • It depends..

  • Can you elaborate?

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