Table of Contents
How can you use phenolphthalein to determine the pH of a substance?
The phenolphthalein indicator allows chemists to visually identify whether a substance is an acid or a base. The color change in phenolphthalein is a result of ionization, and this alters the shape of the phenolphthalein molecules.
What is a phenolphthalein used for?
Phenolphthalein is an organic compound used as a laboratory reagent and pH indicator. Phenolphthalein exerts laxative effects by stimulating the intestinal mucosa and constricting smooth muscles.
Why do we use phenolphthalein as an indicator in titration?
Phenolphthalein is used as an indicator in acid-base titration as it indicates the change in pH by changing its colour [actually, going from colourless (in acidic solution) to pink colour(in basic solution)].
What happens when you take phenolphthalein?
Ingestion: Harmful if swallowed. May cause irritation of the digestive tract. Ingestion may cause fever, blood pressure increase and other unspecified vascular effects. Inhalation: May cause respiratory tract irritation.
Why do we use Phenolphthalein as an indicator in titration?
Why is phenolphthalein a suitable indicator for this reaction?
A strong acid- strong base titration is performed using a phenolphthalein indicator. Phenolphtalein is chosen because it changes color in a pH range between 8.3 – 10. It will appear pink in basic solutions and clear in acidic solutions. Neutralization is the basis of titration.
How do you dilute phenolphthalein indicator?
Phenolphthalein Indicator Solution, Dilute: Dissolve 0.1 g of phenolphthalein in 80 ml of ethanol (95 percent) and add sufficient water to produce 100 ml.
What happens when if you add too much of phenolphthalein?
Phenolphtalein is slightly acidic. It does affect titration because if you add too much, then it will alter the concentration of whichever solution you are adding it in. If you added it to the acid, it will cause that acid to be more acidic than you may have calculated.