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Why do bases turn litmus paper blue?

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Red litmus paper contain a weak diprotic acid in it. Weak acid that is used in acid-base indicator generally have different color between the acid form and the conjugate base ion form. For example,in red litmus paper,the conjugate base ion has blue color,and it's weak acid is red. So it turns litmus paper blue in colour. read more

Red litmus contains a weak diprotic acid. When it is exposed to a basic compound, the hydrogen ions react with the added base. The conjugated base, formed from the litmus acid, has a blue color, so the wet red litmus paper turns blue in alkaline solution. read more

Red litmus paper is used to test an alkaline/base. When a red litmus paper is immersed in a base or alkaline, the red litmus paper turns blue indicating the given solution as alkaline/base. Bases are ions that break up to form OH- (hydroxide) ions in water. The greater the concentration of OH- ions, the stronger is the base. read more

Red litmus paper is dipped into a solution to establish whether a substance is acidic or alkaline. In an acidic or neutral solution, red litmus paper remains red. In an alkaline solution, red litmus paper turns blue. When an alkaline compound dissolves in water, it produces hydroxide ions, which cause the solution to become alkaline. read more

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Acid- Base Indicators
chemistry.elmhurst.edu

Blue Litmus Paper
www.sciencecompany.com

Red Litmus Paper Blue
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