Grade 7, Science Olympiad (CBSE) - Acid-base synthetic indicators 

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Grade 7  |   Science  |   Acid-base synthetic indicators, Acids, bases and salts, Olympiad, CBSE, ICSE, SOF, ITO

Acid-base synthetic indicators

Methyl orange ad Phenolphthalein is commonly used synthetic acid-base indicators.

Methyl orange yields yellow color in the basic medium while Pink color in acidic medium. 

Phenolphthalein yields pink colour in the basic medium while remains colorless in acidic medium. 

Ph scale

It represents the strength if an acid and base. It has the value ranging from 1 to 14. The neutral solution has the pH value of 7, an acidic solution has pH value less than 7 and a basic solution has pH value ranging between 7 to 14.

Universal indicator

It is a mixture of indicators that give a different color for most of the pH values. Usually, a pH paper is used for testing the pH value. 

Lower the pH value higher is the acidic nature of the substances which means it is a strong acid. The higher the pH value means above 7 means the stronger the base is. 



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