Mutual dropping experiments and visualization of high and high chemical solutions

First of all, we must understand a truth, why there are different phenomena of mutual dropping. Generally, there is a continuous reaction (i.e., a step-by-step reaction) before the mutual dropping phenomenon is different.

Then, according to the teaching content of the middle school, the common and different responses to the phenomenon are summarized.

Typical mutual drops are as follows:

1.Mutual dripping of aluminum salts and strong bases.

2.Metaaluminate and strong acids.

3.Sodium carbonate and strong acids.

4.Mutual dripping of silver nitrate solution with ammonia.

AGNO3 vs. NH3 H2O:

AgNO3 was added dropwise to NH3 H2O - no white precipitate at first, and then white precipitate was produced.

NH3 H2O was added dropwise to AgNO3 - there was a white precipitate at the beginning, and then the white precipitate disappeared.

NaOH vs. ALCL3:

NaOH was added dropwise to AlCl3 - white precipitate at first, and then white precipitate disappeared.

AlCl3 is added dropwise to NaOH - no white precipitate at first, and then white precipitate is produced.

HCL with Naalo2:

HCl was added dropwise to Naalo2 - white precipitate at the beginning, and then the white precipitate disappeared.

Naalo2 is added dropwise to HCl—no white precipitate at first, and then white precipitate is produced.

Na2CO3 vs hydrochloric acid:

Na2CO3 is added dropwise to hydrochloric acid - bubbles are created at first, but no bubbles are produced later.

Hydrochloric acid is added dropwise to Na2CO3 – no bubbles at first, then bubbles are produced.

Hello, it needs to be titrated with at least the equivalent amount of sodium chloride first, otherwise there are still a large number of silver ions left in the solution, and it cannot be proved that the silver sulfide precipitate is converted by silver chloride precipitation.

The classmates on the first floor have a point, but they are not comprehensive.

This involves the amount of material (e.g., excess, moderation, small amount), and may also involve the concentration of the solution, the chemical equilibrium, and so on.

Landlord, are you a high school student? Let me tell you about it!

My summary: There are probably several kinds: [may be different from your teacher] The first type: the reaction of metals and nitric acid.

1. Knowledge preparation:

1) Concentrated nitric acid reacts with metals to form nitrogen dioxide.

2) Dilute nitric acid reacts with metals to form nitric oxide.

2. Experimental chemistry: reaction of copper and concentrated nitric acid.

The reaction between copper and concentrated nitric acid, if there is too much copper, the reduction product of nitric acid is nitrogen dioxide at the beginning, and as the reaction progresses, the concentrated nitric acid becomes diluted, and the reduction product of nitric acid is nitric oxide, and finally a mixture of nitrogen dioxide and nitric oxide should be obtained.

In short, it's a matter of adding too much and a small amount, high school?

Are you asking about the carbonic one? There are other precipitated substances, at least those two substances

Just press "Less to change more"! That is, the less will not change according to the stoichiometric number, only the more change! Got it?

1 agno3 vs. nh3 h2o:

AgNO3 was added dropwise to NH3 H2O - no white precipitate was produced at first, and then white precipitate NH3 H2O was added dropwise to Agno3 - white precipitate began to appear, and then the white precipitate disappeared 2 NaOH and AlCl3:

NaOH was added dropwise to AlCl3 - there was a white precipitate at the beginning, and then the white precipitate disappeared AlCl3 was added dropwise to NaOH - no white precipitate was added at first, and then a white precipitate was produced with 3 HCl and Naalo2:

HCl was added dropwise to Naalo2 - there was a white precipitate at the beginning, and then the white precipitate disappeared Naalo2 was added dropwise to HCl, and no white precipitate was added to the HCl, and then a white precipitate was produced 4 Na2CO3 with hydrochloric acid:

Na2CO3 is added dropwise to hydrochloric acid - there are bubbles at the beginning, and then no bubbles are added to Na2CO3 dropwise with hydrochloric acid - no bubbles are added at first, and then bubbles are produced.

The classmates on the first floor have a point, but they are not comprehensive.

This involves the question of the amount of matter (e.g., excess, moderation, small amount), and may also be involved.

The concentration of the solution, the chemical equilibrium, and so on.

Landlord, are you a high school student? Let me tell you about it!

My summary: There are probably several kinds: [may be different from your teacher] The first type: the reaction between the genus of gold and nitric acid.

First, the knowledge of the sail Yu Huai preparation:

1) Concentrated nitric acid reacts with metals to form nitrogen dioxide.

2) Dilute nitric acid reacts with metals to form nitric oxide.

2. Experimental chemistry: reaction of copper and concentrated nitric acid.

The reaction between copper and concentrated nitric acid, if there is too much copper, the original product of nitric acid is nitrogen dioxide at the beginning, and as the reaction progresses, the concentrated nitric acid becomes diluted, and the reduction product of nitric acid is nitric oxide, and finally a mixture of nitrogen dioxide and nitric oxide should be obtained.