Question

sentences.
(i) Ostwald put forward the theory of acid base indicator in .....​

Answer 1

Answer:

partially ionised in solution.

Answer 2

Answer:

This Ostwald's hypothesis states that:

• (a) The acid-base indicator ionizes, resulting in the color change. The ionized form's color is different from the unionized form's color.

• (b) The ionization of the indicator is significantly affected by acids and bases since they are either weak bases or weak acids, respectively.

Explanation:

Ostwald put forward the theory of acid-base indicator in 1891.

It is based on the Arrhenius theory.

According to Ostwald's theory, the acid-base indicator is either a weak acid or a weak base.

In solution, they are merely partially ionized. The colors of the ionized and unionized forms vary. Any indicator's color change results from ionization.

The hydrogen ion ($H^{+}$) is one of the electrically charged atoms or molecules that are produced when an acid dissociates in water, according to the Arrhenius theory, which was first proposed by the Swedish scientist Svante Arrhenius in 1887. On the other hand, bases ionize in water to produce hydroxide ions ($OH^{-}$ ), according to the theory.

Hence,  Ostwald put forward the theory of acid-base indicator in 1891.

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