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How does phenolphthalein work?
Phenolphthalein is an indicator that undergoes a colour change from colourless to pink that begins at a pH of 8.0. So in the titration your performing the phenolphthalein will start to change colour at the point when the moles of acid equal the moles of base. Although this colour change occurs at a pH of 8.0 and not at a pH of 7.0 phenolphthalein is commonly used because of the distinctive colour change that occurs. Phenolphthalein is colourless in acids and pink/purple in base. It also turns orange in very strong acids.
What is the action of sodium hydroxide on the colour of phenolphthalein?
Phenolphthalein is pink in basic solutions.Phenolphthalein is used as an indicator in volumetry - acid-base titration.
What colour does hydrochloric acid turn phenolphthalein?
It should be clear. Phenolphthalein doesn't change color in the presence of an acid, only a base.
What colour in sulfuric acid is phenolphthalein?
Phenolphthalein is colorless in sulfuric acid.
What will happen when phenolphthalein paper is used to test a base?
It will change its colour from white to red on increasing the pH(for bases)
Which Colour do alkali turn phenolphthalein?
Alkalis turn phenolphthalein pink or magenta.
What is the colour of phenolphthalein in lemon juice?
red
What colour appear when lime water plus phenolphthalein?
When lime water (a solution of calcium hydroxide) is mixed with phenolphthalein, the solution turns pink. This occurs because phenolphthalein is a pH indicator that changes color in basic solutions. Lime water is alkaline, so it causes the phenolphthalein to shift from colorless to pink in the presence of a base.
What colour would phenolphthalein go if added to borax solution?
Phenolphthalein would turn pink in a borax solution, indicating the solution is basic. Borax acts as a weak base in solution and would cause phenolphthalein to change color due to its alkaline nature.
What colour in calcium hydroxide is phenolphthalein?
Pink. Calcium hydroxide turns phenolphthalein pink when it is in a basic solution.
What is the colour of zinc ions mixed with ammonia in phenolphthalein indicator?
The phenolphthalein indicator is pink in basic solutions.
What is the purpose for using phenolphthalein for an acid base titration?
Phenolphthalein is used as an indicator in acid-base titrations because it changes color at a specific pH range. In an acid-base titration, phenolphthalein changes from colorless to pink when the solution reaches a pH around 8.2-10, indicating the endpoint of the titration. This allows for a visual indication of when the reaction is complete.
