Question

describe the colour changes in the universal indicator alkali and alkaline solution i when a acid gradually addedto it​

Answer 1

Answer:

universal indicator is a pH indicator made of a solution of several compounds that exhibits several smooth colour changes over a wide range pH values to indicate the acidity or alkalinity of solutions. Although there are several commercially available universal pH indicators, most are a variation of a formula patented by Yamada in 1933. Details of this patent can be found in Chemical Abstracts. Experiments with Yamada's universal indicator are also described in the Journal of Chemical Education.

Explanation:

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Answer 2

The universal indicator is a mixture of several indicators; which is is available in two forms of nature i.e;

1. pH paper,

2.pH solution.

pH is the power of hydrogen ions present in the solution.

the pH paper contains of 14 divisions in which:->

0 to 7 determine acidic solution,

7 to 14 determine basic solution,

7 is neutral.

When acid is gradually added to the pH solution;

the colour of the solution slowly changes to yellow, then orange, then red which is the stongest acid.

Similarly , on gradually adding base to the solution , the colour changes slowly to blue.