## What happens when you mix NaOH and phenolphthalein?

Explanation: When the sodium hydroxide, which is a base, is mixed with phenolphthalein, it turns pink. This happens because the base is neutralized in an acid solution, which causes the indicator to become colorless. All of the base is neutralized by the citric acid.

What is the rate law for the reaction involving phenolphthalein and NaOH?

In any of the individual runs, the NaOH concentration exceeds that of phenolphthalein by a factor of 103 to 104. Therefore, during each run the NaOH concentration remains constant and the rate law becomes: Rate = k1[P-2]m.

### Will NaOH turns pink phenolphthalein?

What happens when HC2H3O2 reacts with NaOH?

NaOH + HC2H3O2 → NaC2H3O2 + H2O – Balanced equation | Chemical Equations online!

## What is the purpose of phenolphthalein in titration?

Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. It belongs to the class of dyes known as phthalein dyes.

What is the color change of phenolphthalein?

Phenolphthalein is an indicator — a chemical which changes colour depending on whether it meets an acid or a base. It turns purple if it meets something basic, such as ammonia; it stays colourless if it meets an acid like vinegar or a neutral substance like water.

### Does phenolphthalein turn pink in acid or base?

Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions.

What does it mean when phenolphthalein turns pink?

Phenolphthalein, an acid-base indicator used to test the pH of a solution, turns pink due to the presence of a weak base. Although the anions are pink, the solution remains colorless in the presence of an acid. If the pH of the solution is 8.2 or above, the number of anions increases, causing the solution to turn pink.

## What is the colour change of phenolphthalein in NaOH?

pink
Sodium Hydroxide and Phenolphthalein Phenolphthalein is a universal indicator, which means it changes color to show the pH of certain solutions. Phenolphthalein stays colorless in acidic solutions and turns pink in alkaline solutions. Sodium hydroxide is a base, so when you add phenolphthalein, the solution turns pink.

What is the colour of phenolphthalein in NaOH solution?

It is colourless below pH 8.5 i.e. in acidic solutions and attains a pink to deep red hue above pH 9.0 i.e. in basic solutions. Therefore, when phenolphthalein is added to caustic soda which is a strong base, it turns pink in colour.

### What is the rate law for phenolphthalein and NaOH?

In any of the individual runs, the NaOH concentration exceeds that of phenolphthalein by a factor of 103to 104. Therefore, during each run the NaOH concentration remains constant and the rate law becomes: Rate = k1[P -2]m. In this new rate law, k1= k2[NaOH]

How to make phenolphthalein NaOH in a flask?

Standard Phenolphthalein Solution:Dilute one mL of a phenolphthalein solution with 4 mL of ethyl alcohol. Standard 0.300 M NaOH Solution: Weigh 1

## How to calculate the rate of reaction in NaOH?

1. The rate law is then: Rate = k2 (Absorbance) m[NaOH]n By measuring the reaction rate at several different concentrations of NaOH, it can be shown that the reaction is first order in NaOH and the rate constant, k2can be evaluated. k1= k2[NaOH] nif n = 0, then k 2 will equal k1for all four runs.

Why does phenolphthalein fade at the end of a titration?

If excess base is present at the end of an acid-base titration, the pink phenolphthalein color fades if the solution is allowed to stand for a while. This slow fading is of no consequence to the titration. However the fading of phenolphthalein in basic solution is an excellent example of second order reaction kinetics.