What is the ratio [ A − ] / [ HA ] [A−]/[HA] at pH 2.75 ? 2.75? The p K a pKa of formic acid (methanoic acid, H − COOH ) H−COOH) is 3.75.

The ratio of  is 0.1

Explanation:

The chemical equation for the dissociation of monoprotic weak acid (formic acid) follows:

To calculate the pH of acidic buffer, we use the equation given by Henderson Hasselbalch:

We are given:

= negative logarithm of acid dissociation constant of methanoic acid = 3.75

 = ratio of concentration of salt and acid

pH = 2.75

Putting values in above equation, we get:

Hence, the ratio of  is 0.1

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.