Recall that HCN is hydrocyanic acid and is a weak acid. The Ka reaction would be an equilbrium reaction with water.

You are watching: What is the ka reaction of hcn

Acid: H+ donorBase: H+ aceptor

HCN(aq) + H2O(l) CN–(aq) + H3O+(aq)(weak acid) (base) (conjugate base) (conjugate acid)

The Ka reaction of HCN is HCN(aq) + H2O(l) ⇌ CN–(aq) + H3O+(aq).

The Ka expression is:

Ka=productsreactantsKa=6.2×10-10=

For the next part, we are being asked to find Kb for CN–. CN– is the conjugate base of the weak acid HCN.

Hence, the Kb of CN– can be calculated from the Ka of HCN. Ka and Kbare connected by the autoionization constant of water (Kw)in the following equation:

81% (373 ratings) Problem Details

a. What is the K a reaction of HCN? The Ka of HCN is 6.2 × 10-10.

b. What is Kb value for CN– at 25°C?

Learn this topic by watchingKa and Kb Concept Videos
All Chemistry Practice Problems Ka and Kb Practice Problems
Q.
Q.
Q.
Q.
See all problems in Ka and Kb

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Ka and Kb concept. You can view video lessons to learn Ka and Kb. Or if you need more Ka and Kb practice, you can also practice Ka and Kb practice problems.

What is the difficulty of this problem?

Our tutors rated the difficulty ofa. What is the K a reaction of HCN? The Ka of HCN is 6.2 × 1...as medium difficulty.

How long does this problem take to solve?

Our expert Chemistry tutor, Dasha took 3 minutes and 35 seconds to solve this problem. You can follow their steps in the video explanation above.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Golde's class at PITT.

SUBJECTS
SCHOOLS
DISCOVER
ACCOUNT
LEGAL © 2021 Clutch Learning, Inc. Clutch Prep is not sponsored or endorsed by any college or university.
×

OR
Email