Is it necessarily an acidic solution that can make the purple litmus solution red?

The litmus solution has the characteristics of acid red alkali blue, and the acidic solution can make the purple litmus solution red, so the solution that can make the purple litmus solution red must be acidic, this sentence is true. However, acidic solutions are not necessarily acids, they may be salts, and there are many kinds of acidic solutions, such as nitric acid.

Hydrochloric acid, sulfuric acid, carbonic acid, vinegar, etc., and the aqueous solution of some salts is also acidic, such as aluminum sulfate.

Copper sulfate solution, sodium bisulfate solution, etc.

Not necessarily. The acidic solution can turn the purple litmus solution red. However, acidic solutions are not necessarily acids, but may be salts, such as aluminum sulfate, ammonium nitrate, etc.

It should be said that the solution that can make the purple litmus solution red must be an acidic solution. "A solution that does not discolor the phenolphthalein solution may be an acidic solution, a neutral solution, or a weakly alkaline solution. "It may also be a neutral solution or a weakly alkaline solution".

That's right, but another statement is not true, FYI.

No, because it may also be an acid salt or a strong acid and weak alkali salt solution, such as NH4Cl solution is also acidic and can make the purple litmus solution red, but it is not an acid.

Is it possible that the solution is red ink, and he can also make the purple litmus red.

Limus is a weak organic acid with a relative molecular weight of 3300, which changes its conjugate structure and changes color under the different actions of acid-base solutions.

The principle of litmus changing color is: hin

Reversible = h++

With the change of acidity and alkalinity of the solution, its molecular structure changes and presents different color changes(1) In acidic solution, molecules are the main form of its existence, making the solution red; (The balance shifts to the left due to the increase in [h+]).

2) In the alkaline solution, the ionization equilibrium of litmus hydrolysis shifts to the right, and the acid ions produced by ionization are the main form of its existence, so the solution is blue with long and short intestines. (The balance shifts right due to the increase in [oh-]).

3) In a neutral solution, molecules and acid ions coexist, so the solution is purple.

The color-changing pH range of litmus is: 5 8, red when the solution pH < 5, blue when pH >8, and purple when pH 5 8.

Hope it helps.

The litmus solution turns red when exposed to acid. When exposed to alkali, it turns blue. Note that acid or alkali solutions can discolor purple litmus solutions or colorless phenolphthalein solutions, while acids or bases that are insoluble in water cannot discolor the indicator. For example, copper hydroxide cannot make a purple litmus solution turn blue.

The purple litmus test solution turns red when it is acid, and blue when it is alkaline.

Sour red alkali blue is litmus, which our teacher taught.

Hope that helps.

Purple litmus solution is a common chemical in chemical experiments, which is usually used to test the acidity and alkalinity of the solution. Purple litmus solution is generally made by mixing distilled water and litmus powder, and at room temperature and pressure, the purple litmus solution will appear purple. The purple litmus solution is dropped into the solution to be tested, and the reaction phenomenon can be found after the reaction phenomenon appears, and the purple litmus solution turns red when it is acid, and it turns blue when it is alkaline.