ACID-BASE INDICATORS AND MEASURING PH EXPLAINED | LITMUS, UNIVERSAL INDICATOR AND PH METER.

How can you tell whether a colourless solution is acidic, neutral or alkaline—without tasting it? The answer lies in acid-base indicators and pH measurement! In this lesson from The Reaction Zone, we explore how chemists use indicators and other methods to identify acidic and alkaline solutions and estimate or measure their pH. In this video, you will learn: How litmus paper identifies acids and alkalis The colour changes of methyl orange How phenolphthalein behaves in acidic and alkaline solutions How universal indicator produces different colours across the pH scale How pH paper is used to estimate pH How a pH meter provides a more precise numerical pH measurement The difference between identifying whether a solution is acidic/alkaline and actually estimating its pH Key colour changes to remember: Litmus: Acid → Blue litmus turns red Alkali → Red litmus turns blue Methyl Orange: Acid → Red Alkali → Yellow Phenolphthalein: Acid → Colourless Alkali → Pink Universal Indicator: Produces a range of colours that can be compared with a pH colour chart to estimate pH. pH Meter: Provides a more precise numerical measurement of pH when properly calibrated. This lesson is ideal for secondary/high-school Chemistry students and students preparing for examinations including WAEC, NECO, JAMB/UTME and GCSE Chemistry. If you found this lesson helpful, LIKE the video, SHARE it with another Chemistry student and SUBSCRIBE to The Reaction Zone for more Chemistry lessons. THE REACTION ZONE — Where Curiosity Meets Chemistry! Keep questioning. Keep reacting. And remember—when curiosity meets chemistry, you're in THE REACTION ZONE! I'll see you in the next reaction! #AcidBaseIndicators #pH #Chemistry #Indicators #LitmusPaper #UniversalIndicator #pHMeter #ChemistryLesson #TheReactionZone