Chemistry, 11.10.2019 08:31 janeliles

Select all that apply.
which of the following are good ways to test whether a solution is an acid or a base?
tasting it
litmus paper
phenolphthalein
touching it

Answers: 3

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Answer from: MikeCrotch19251

Tasting it and touching it are both potentially dangerous for a start haha. SO DONT DO THOSE ONES.

Litmus paper is a good choice because its colour changes based on the presence of an acid or base.
Phenolphthalein is an acid-base indicator and does a similar thing to litmus.

Litmus paper and phenolphthalein are the right choices

Answer from: justhereforanswers13

Answer : The correct options are, litmus paper and phenolphthalein.

Explanation :

Acid : It is a substance that has ability of donating proton or hydrogen ion, H^+ .

The properties of an acid are :

Acids are sour in taste.

The texture of an acid solution is sticky.

It changes the color of the litmus paper to red.

Base : It is a substance that has ability of donating hydroxide ion, OH^- .

The properties of an base are :

Base are bitter in taste.

The texture of an base solution is slippery.

It changes the color of the litmus paper to blue.

Indicators : It is a substance that gives the visible sign by the color change of the chemical species like an acid or a base.

Litmus paper : It turns red when it is added to a strong acid, it turns blue or purple when it is added to a strong base and it turns a yellowish-green when it is added to a neutral solution.

Phenolphthalein : It is also used as an indicator in acid–base titrations. It turns colorless in acidic solutions and pink in basic solutions.

Thus, there are two good ways to test whether a solution is an acid or a base which are litmus paper and phenolphthalein.

Answer from: Quest

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

Answer from: Quest

It is sure ( overimitation)

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