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3 years ago

What is the purpose of adding phenolphthalein to your Erlenmeyer flask prior to starting a titration?

Chemistry

1 answer:

koban [17]3 years ago

3 0

Answer:

a. The phenolphthalein acts as a color changing indicator to signal the endpoint of the reaction.

Explanation:

Phenolphthalein is an organic substance with chemical formula $C_{20}H_{14}O_{4}$ .

It is a substance commonly used in acid-base titrations to indicate the end point in the titration because phenolphthalein is colorless in acidic solutions but turns a purplish-pink color in basic solutions.

In this way it helps visually to notice when the final point of the titration has been reached.

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True/False Indicate whether the sentence or statement is true or false. The number 1 234 000 in scientific notation is equal to

Shalnov [3]

False bc 1.234 x 10^5 is 123400

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3 years ago

Which of the following is not a characteristic of a metal?

jolli1 [7]

Answer:

B. Poor conductor.

Explanation:

It cannot be A, as only 1 metal is not solid at room temp.

It cannot be C, as most metals are ductile.

It cannot be D, as most metals are malleable.

This leaves B, which is not true about metals, as a lot are very good conductors.

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1 year ago

Bromine, a liquid at room temperature has a boiling point of 58 degrees celsius and a melting point at -7.2 degree celsius bromi

ra1l [238]

Hello!

Bromine can be classified as a pure substance.

Why?

Bromine is an element with atomic number 35 on group 17 of the Periodic Table. That's the first sign that shows us that it is a pure substance.

But the fact that it has a clear and defined boiling and melting point is a sign that we are in the presence of a pure substance. Pure substances are characterized by defined boiling and melting points.

Mixtures usually have a range of temperatures in which they melt and boil.

Have a nice day!

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3 years ago

Which statement is true about matter?

sergeinik [125]

Answer:

Explanation:

This is because matter is anything that has mass and occupies space.Therefore the space occupied by matter is volume

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2 years ago

What do you think could be happening to the sand eels

Alex777 [14]

Answer:

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Explanation:

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3 years ago

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