What conclusion do you get about nature of magnesium hydroxide from its action on litmus paper?
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By altering the structure of the dye molecule within the litmus paper.
Litmus paper is impregnated with an organic dye that, due to its molecular structure, emits light in the visible part of the electromagnetic spectrum. This same molecular structure is also what allows the dye to act as an acid - the molecule readily gives up a proton because the resulting ion will be stabilized by electronic withdrawal and delocalization across its structure.
Now, as long as the organic dye retains its protons, it stays red. But when a basic substance (such as the hydroxide ion in NaOH) comes into contact with the dye, it pulls those protons off of the dye molecules, causing bonds to break and electrons to shift. This affects bond conjugation within the dye molecule, which then changes the way the molecule absorbs and emits light (and therefore changes its color).
Litmus paper is impregnated with an organic dye that, due to its molecular structure, emits light in the visible part of the electromagnetic spectrum. This same molecular structure is also what allows the dye to act as an acid - the molecule readily gives up a proton because the resulting ion will be stabilized by electronic withdrawal and delocalization across its structure.
Now, as long as the organic dye retains its protons, it stays red. But when a basic substance (such as the hydroxide ion in NaOH) comes into contact with the dye, it pulls those protons off of the dye molecules, causing bonds to break and electrons to shift. This affects bond conjugation within the dye molecule, which then changes the way the molecule absorbs and emits light (and therefore changes its color).
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Answer:
the colour changes from red litmus to blue
Explanation:
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