Chemical indicator and salts | Prep.1 | Unit 1 - Lesson 3 | Science

شرح ساينس الصف الأول الاعدادي لغات - الفصل الدراسي الثاني
شرح ساينس الاول الاعدادي - ترم تاني

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In This Part :
Indicators
Are chemical substances whose color differs in acidic medium from that in alkaline medium.
Examples of chemical indicators include
1. Litmus indicator
The litmus indicator is used in the composition of litmus strips, which its color change according to the type of medium, as follows:

Universal indicator
An indicator that can differentiate between acids and alkalis or between different acids or different alkalis based on their strength.

Potential of hydrogen pH
A scale ranging between the values O to 14, used to determine the acidity and
the basicity of solutions.

pH meter device
This device determines the pH value of any solution directly and accurately, as the pH value is displayed immediately on the device's digital screen

Universal indicator strips
These provide an approximate measuring of the pH values of the solutions, where the colour of the strip, (after being dipped in the solution) is compared to the indicator scale provided with the box, where each colour represents a definite pH value

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