Does the following reaction have a Kp? Explain. HCOOH ( aq ) + CN 1- (...

Does the following reaction have a Kp? Explain.
HCOOH ( aq ) + CN 1- ( aq ) ⇌ HCN ( aq ) + HCOO 1- ( aq )

Expert Solution

No.

Kp is a equilibrium constant which is dependent on the pressure of reactants and products. Kp is only for gaseous components.

aA + bB ⇌ cC + dD

K _p = p^c_C p^d_D / p^a_A p^b_B

Above reaction involved only solutions. So Kp is can not be obtain directly.

But

Kc is a equilibrium constant which is dependent on concentrations of reactants and products. Kc can obtain for the reaction.

Kc = K _c = [C] ^c [D] ^d / [A] ^a [B] ^b

K_p = K_c (RT) ^∆n

Where ∆n = (c + d) – (a + b) i.e. number of moles of gaseous products – number of moles of gaseous reactants in the balanced chemical reaction.

HCOOH ( aq ) + CN 1- ( aq ) ⇌ HCN ( aq ) + HCOO 1- ( aq )

∆n = zero or the above reaction

So K_p = K_c (RT) ⁰

K_p = K_c

Kc will be equal to Kp.

queen_honey_blossom answered 2 years ago

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