Write observations when various indicators are used in test tubes A containing dilute solution of sodium hydroxide and B containing dilute HCl
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see actually .. one is acid and another one is base .. okk .. when they will react ..then they will neutralized ., by each other .and. form a salt .and water. . so .. ....
Jayanshi11103:
But what are the observations...?? Like if we add phenolphthalein in A it will become pink and in B it will become colourless
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Phenolphthalein is basic indicator which remain colorless in acidic and neutral solution and turns pink or magenta in basic solution.
(i) when few drops of phenolphthalein is added to sodium hydroxide, the solution turns deep pink as NaOH is a strong base.
(ii) If dilute HCl is added to the solution then the color of the solution get fades and if we keep on adding HCl, the solution becomes colurless. As HCl being a strong acid will neutralize NaOH.
(iii) If few drops of NaOH is added again to the same solution, the solution become basic and the pink color of the phenolphthalein reappears.
hoping helps you
(i) when few drops of phenolphthalein is added to sodium hydroxide, the solution turns deep pink as NaOH is a strong base.
(ii) If dilute HCl is added to the solution then the color of the solution get fades and if we keep on adding HCl, the solution becomes colurless. As HCl being a strong acid will neutralize NaOH.
(iii) If few drops of NaOH is added again to the same solution, the solution become basic and the pink color of the phenolphthalein reappears.
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