Weak Acid Strong Base Titrations Video Lessons

Concept:

# Problem: Equal quantities of 0.010M solutions of an acid HA and a base B are mixed. The pH of the resulting solution is 9.3.Write equilibrium-constant expression for the reaction between HA and B.

###### FREE Expert Solution

We're asked to write the equilibrium-constant expression for the reaction between an acid, HA and a base, B.

Recall that the equilibrium constant is the ratio of the products and reactants:

$\overline{){\mathbf{K}}{\mathbf{=}}\frac{{}_{\mathbf{products}}}{{}_{\mathbf{reactants}}}}$

Note that solid and liquid compounds are ignored in the equilibrium expression.

First, we need to write the equation for the reaction between HA and B, recall that:

B is a base and based on Bronsted-Lowry definition it is a proton (H+) acceptor.

HA is an acid and based on Bronsted-Lowry definition it is a proton donor.

The equation is:

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###### Problem Details

Equal quantities of 0.010M solutions of an acid HA and a base B are mixed. The pH of the resulting solution is 9.3.

Write equilibrium-constant expression for the reaction between HA and B.