Question

Describe what happens to a pink phenolphthalein agar cube when placed into vinegar

Describe what happens to a pink phenolphthalein agar cube when placed into vinegar

Homework Answers

Answer #1

Sides of the pink phenolphthalein agar will become colourless when placed in vinegar.

As hydrogen ion present in vinegar enters the agar cube, the colour of the agar changes.

We can see the colour change up to the distance/depth where the H+ ion diffused into the agar

Phenolphthalene is a pH indicator. It is pink in colour in alkaline pH and colourless in acidic pH. We know vinegar is acetic acid. Therefore when the pH changes from alkaline to acidic, pink colour of the agar will change and it will become colourless up to the depth where the H+ ion diffused into.

If the H+ ion diffuse fully upto the centre, the whole agar block will become colourless

This is an experiment used to the measure the time taken and distance travelled by the diffusing H+

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
What happens to a ferromagnetic material when it is placed in a magnetic field?
What happens to a ferromagnetic material when it is placed in a magnetic field?
What happens to the membrane potential when a neuron is placed in a solution that is...
What happens to the membrane potential when a neuron is placed in a solution that is high in K+? Why does this occur?
What happens when a piece of shark liver is placed in water? What is an advantage...
What happens when a piece of shark liver is placed in water? What is an advantage of such property?
Describe what happens to a mixture you have placed on a chromatographic column as you increase...
Describe what happens to a mixture you have placed on a chromatographic column as you increase the polarity of the solvents you run through the column.
Describe how blood glucose is regulated (Include the organs and hormones involved). Describe what happens when...
Describe how blood glucose is regulated (Include the organs and hormones involved). Describe what happens when blood glucose increases and what happens when blood glucose decreases.
Describe what happens in the economy when there is an increase in the level of the...
Describe what happens in the economy when there is an increase in the level of the factors of production (the endowment) in the short run and long run.
What happens when an acid reacts with a metal? What happens when an acid reacts with...
What happens when an acid reacts with a metal? What happens when an acid reacts with a base? Describe the general reaction and give an example with products.
Describe what happens when a positive charged rod is brought close (but does not touch) to...
Describe what happens when a positive charged rod is brought close (but does not touch) to a metal electrosphere? What happens (same scenario) if the electrosphere is neutral?
Describe what happens when a bar magnet is pushed into or pulled out of a solenoid...
Describe what happens when a bar magnet is pushed into or pulled out of a solenoid connected to an ammeter.
What term would an economist use to describe what happens when a shopper gets a “good...
What term would an economist use to describe what happens when a shopper gets a “good deal” on a product?
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT