Blue litmus paper is dipped in a solution it remains blue what is the nature of the solution explain

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Indicators and the pH scale Solutions can be acidic, alkaline or neutral: • we get an acidic solution when an acid is dissolved in water • we get an alkaline solution when an alkali is dissolved in water • solutions that are neither acidic nor alkaline are neutral Pure water is neutral, and so is petrol. An indicator is a substance that changes colour when it is added to acidic or alkaline solutions. You can prepare homemade indicators from red cabbage or beetroot juice - these will help you see if a solution is acidic or alkaline. Litmus and universal indicator are two indicators that are commonly used in the laboratory. Litmus Litmus indicator solution turns red in acidic solutions and blue in alkaline solutions. It turns purple in neutral solutions. Litmus paper is usually more reliable, and comes as red litmus paper and blue litmus paper. The table shows the colour changes it can make. Red litmus Blue litmus Acidic solution Stays red Turns red Neutral solution Stays red Stays blue Alkaline solution Turns blue Stays blue Notice how we say 'stays red'. This is better than saying 'nothing' or 'stayed the same', because it tells us the colour we actually see. Alkalis turn red litmus paper blue Universal indicator and the pH scale Universal indicator is supplied as a solution or as universal indicator paper . It is a mixture of several different indicators. Unlike litmus, universal indicator can show us how strongly acidic or alkaline a solution is, not just that the soluti...

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