Question

The graph given below depicts a neutralization reaction (acid + alkali → salt + water). The pH of a solution changes as we add excess of acid to an alkali. Which letter denotes the area of the graph where both acid and salt are present?
A. A
B. B
C. C
D. D​

Answer 1

Letter D denotes the stage of titration when both acid and salt are present.

Detailed Information:

• When we are performing an acid-base titration, we are taking alkali in a beaker and the acid in the buret. Then we slowly release acid into alkali and check for the endpoint by seeing the colour change of indicator

• As the acid is being added, the pH in the graph decreases.

• Once the concentration of alkali becomes equal to concentration of acid, they react to form salt and water. This makes the pH as 7 (point C on graph).

• When we keep on adding acid, the medium becomes acidic (pH < 7). This means that the medium contains excess acid and also salt (from reaction).

$\star$ Hope It Helps.

Answer 2

Answer:

Letter D denotes the stage of titration when both acid and salt are present.

Detailed Information:

When we are performing an acid-base titration, we are taking alkali in a beaker and the acid in the buret. Then we slowly release acid into alkali and check for the endpoint by seeing the colour change of indicator

As the acid is being added, the pH in the graph decreases.

Once the concentration of alkali becomes equal to concentration of acid, they react to form salt and water. This makes the pH as 7 (point C on graph).

When we keep on adding acid, the medium becomes acidic (pH < 7). This means that the medium contains excess acid and also salt (from reaction).