When 4 drops of phenolphthalein are added to hydrochloric acid What is the solution?

When 4 drops of phenolphthalein are added to hydrochloric acid What is the solution?

Answer. Phenolphthalein is an indicator which is colourless in acidic medium and pink in basic medium. Since Hydrochloric acid is an acid,the solution will turn Colourless.

What happen when a few drops of phenolphthalein are added to an acidic solution?

Answer: We all know that phenolphthalein gives no colour when added to an acidic solution. Phenolphthalein is an acid indicator,means when we add water (pH 7) to it,it ionises giving a pink colour. If concentration of is greater than that of then the solution will be colourless.

What happens when a few drops of phenolphthalein is added to dilute HCL?

When few drops of phenolphthalein are added to a dilute solution hydroxide a pink colour is produced.

What happens when phenolphthalein is added to water?

Lime water is a base, so when the phenolphthalein was added to the solution, it turned the solution pink. When enough carbonic acid is formed it neutralizes the lime water, which is a base and makes the solution an acid. Therefore with the phenolphthalein, the color disappears in the now acidic solution.

Does the Colour of phenolphthalein reappear?

Phenolphthalein is basic indicator which remain colorless in acidic and neutral solution and turns pink or magenta in basic solution. (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.

When few drops of phenolphthalein are added to a dilute solution of sodium hydroxide?

When few drops of phenolphthalein are added to a dilute solution of sodium hydroxide a pink colour is produced.

What happens when phenolphthalein is added to NaOH?

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 happens when two drops of phenolphthalein are added to a dilute solution of NaOH?

Phenolphthalein remains colourless in neutral or acidic solution but turns out magenta or pink in basic solutions. When it is added to NaOH, the solution has the colour of pink since sodium hydroxide is a strong base.

What is the Colour of phenolphthalein in dilute HCL?

On adding nearly 5 mL sodium hydroxide solution to the mixture of hydrochloric acid and phenolphthalein solution, the colour of the mixture changes to pink. On addition of hydrochloric acid solution to the pink solution, the colour starts fading gradually and finally the solution becomes colourless.

What will be the change in Colour when a few drops of phenolphthalein?

It shows pink colour in basic medium while remaining colourless in acidic medium. While in basic medium the OH ions ionizes it and converts it into ionized form which is pink in colour. Since, lime water is basic in nature, so, it will convert phenolphthalein in its ionized form and its colour will change to pink.

When a drop of phenolphthalein is added to solution a it turns pink Solution A is?

Solution A gives pink color when a drop of phenolphthalein indicator is added to it, hence, it is a basic solution and pH range in between 9-10. Solution B gives red color when a drop of methyl orange is added to it, hence, it is an acidic solution and pH range in between 4-6. Therefore, solution A has higher pH value.

What does pink phenolphthalein mean?

Phenolphthalein, an acid-base indicator used to test the pH of a solution, turns pink due to the presence of a weak base. The indicator itself is a weak, colorless acid that forms pink anions when it dissolves in water. Although the anions are pink, the solution remains colorless in the presence of an acid.

What is a natural indicator?

Indicators are chemical compounds that tell us whether a substance is acidic or basic by changing its colour. The indicators that are obtained from plants are known as natural indicators. Examples – Turmeric, china rosa, red cabbage and grape juice.

When a few drops of phenolphthalein indicator are added to an acidic solution what will be the change in Colour of the solution?

Solution : Phenolphthalein acquires pink colour in sodium hydroxide solution because of its basic nature. On adding excess of HCl, the solution will become acidic and the solution will change colour from pink to colourless.

Is there any Colour change for the reaction mixture?

Add dilute HCL solution to the above solution drop by drop, Is there any colour change for the reaction mixture? (ii) Yes, if dilute HCl is added to the solution then the colour of the solution get fades and if we keep on adding HCl, the solution becomes colourless.

What is the Colour of the solution?

The colours from yellow to red indicate an acidic solution, colours blue to violet indicate alkali and green colour indicates that a solution is neutral.

Why did the Colour of phenolphthalein change after the addition of an acid?

Answer: Phenolphthalein is a weak acid, which is why when it is added in a strong base, it gives pink color and the color gets intense as the PH of the base increases. By adding HCL in the solution, the pink color of phenolphthalein will disappear.

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. It belongs to the class of dyes known as phthalein dyes.

Why phenolphthalein is used in acid-base titration?

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.

Why do we take base in burette?

Since acid has lower pH than base, acid is highly reactive and vulnerable than base. If we take acid in an burette solution, it should be properly opened, closed during the end point of reaction. This is the reason to take acid in an conical flask and base in an burette.

What is the liquid inside the burette called?

In a gas burette, the stopcock is at the top; the tube of the burette is filled with a fluid, such as water, oil, or mercury, and the bottom of the tube is attached to a reservoir of the fluid.

Do you pour base into acid?

2.1 Acids. If you wish to dilute an acid with water before neutralizing it with a base (e.g., sodium hydroxide, potassium hydroxide or sodium bicarbonate), always add acid to water; never add water to acid.

Does the acid or base go in the burette?

To begin with we need to have a solution with a known concentration, which we call a standard solution. If the unknown sample is an acid, then the standard in the burette needs to be a base as you are aiming to see at what point the unknown sample is neutralised.

What is the most accurate way to read in a titration?

Calibrate Your Electrode Regularly A pH electrode should be calibrated each day (at least once) it is used to get the most accurate reading. A two-point method is typically sufficient, as long as the appropriate buffers are used.

Why is it better to titrate a base into acid?

The purpose of a strong acid-strong base titration is to determine the concentration of the acidic solution by titrating it with a basic solution of known concentration, or vice-versa, until neutralization occurs. Therefore, the reaction between a strong acid and strong base will result in water and a salt.

Why is a white tile used in titration?

A white tile can be placed underneath the conical flask to aid with the ease of spotting the end point colour change. The volume of alkali added is referred to as the titre value; multiple titres are usually taken until concordant results are obtained.