Metal reacts with acid, why does the mass of the metal decrease and the mass of the solution increas

Because after the metal is dissolved, it enters the solution in the form of ions. So the mass of the solution increases and the mass of the metal decreases. Although the reaction releases hydrogen, the mass of the hydrogen released is much smaller than that of the metal ions.

The few people upstairs are basically right, but it is easy to understand that it is better to choose Xiao Shuilan's answer, and it is just a suggestion.

Hydrogen ions are oxidizing, while most metals are reducible. When the other gate reacts, the hydrogen ions are reduced to hydrogen gas, and the metal is oxidized to the corresponding metal cations. According to common sense, the relative molecular mass of hydrogen is 1, while metal is relatively large relative to hydrogen.

According to the principle of conservation of mass, the mass added by the solution = the mass of the metal - the mass of the hydrogen released.

Because the metal (reactive) can react under acidic conditions and become ions, the mass of the metal decreases and the mass of the solution increases.

Because the metal dissolves into the acid and becomes ionic, the mass of the solution naturally increases, and the mass of the metal decreases.

Acids and metals react to produce hydrogen.

At the time of acid deficiency the amount of hydrogen up to the acid.

It's like yes.

In the case that you are hungry, only buns can be eaten.

So whether you're going to be full or not depends on the number of buns.

Because of this condition.

Buns are the deciding factor.

In the same way, the amount of hydrogen produced is determined by the acid.

Invasion and deletion.

Acid reacts with metals, when acid is insufficient, why is the mass of hydrogen produced determined by acid?

This is obvious, according to the law of conservation of matter and the chemical equation, the reaction is carried out according to a certain mass ratio, that is to say, a gram of acid, must be b gram of metal, in order to react to obtain c gram of hydrogen.

If a is less, it must be that the metal has not finished reacting, and the hydrogen produced will also be less, and the amount of hydrogen produced is produced after all the acid has been reacted. That is, the hydrogen produced is determined by the acid.

It's a good question.

2h++m=m2++h2

It is equivalent to an excess of metal, and when the acid reaction is finished, the reaction stops.

Therefore, the amount of hydrogen displaced, is determined by the acid.

The same mass of acid is equal to the hydrogen reaction of a sufficient amount of residual metal.

For an equal mass of metal and a sufficient amount of acid, m = metal valency relative to the molecular mass of the wheel.

m metal, from the formula, when the mass of the metal is constant, the mass of hydrogen gas generated is directly proportional to the valence of the metal wax, and the relative molecular mass is inversely proportional.

Zn + 2HCl ==ZNcl2 + H2 solution mass increases.

Mg+ 2HCl ==MgCl2 + H2 solution mass increases.

2Al + 6HCl ==2AlCl3 + 3H2 solution source sells brother mating bond mass to increase hail.

Fe + 2HCl ==FeCl2 + H2 solution mass increases.

Acids and metals react to produce hydrogen.

At the time of acid deficiency the amount of hydrogen up to the acid.

It's like yes.

In the case that you are hungry, only buns can be eaten.

So whether you're going to be full or not depends on the number of buns.

Because of this condition.

Buns are the deciding factor.

In the same way, the amount of hydrogen produced is determined by the acid.

Invasion and deletion.

The chemical reaction is carried out according to the reaction equation, the essential reaction is the reaction of hydrogen ions and metal elements, correcting a bend of the reed is not air, it is hydrogen H2, as long as the mountain is the same acid and the metal reaction of different burial zones, the mass is the same, the number of moles is the same, and the hydrogen generated is of the same mass.

In the case of a surplus of metals, the same mass of acid reacts with the metal to produce as much mass of hydrogen.

The image problems of the reaction between metal and acid that are commonly tested in the high school entrance examination can be divided into two categories:

An equal amount of metal reacts with an adequate amount of acid, respectively: i.e., an excess of acid (a sufficient amount).

The same amount of acid reacts with an adequate amount of metal: insufficient acid (excess metal).

There are only four metals that are commonly examined in junior high school chemistry: magnesium (mg), iron (Fe), zinc (Zn), and aluminum (Al).

Problem solving skills: First of all, it is necessary to judge the excessive and small amount of metals and acids, generally through the words "small amount", "sufficient amount", "excessive" and so on in the question stem. The amount of hydrogen produced in the reaction is determined by the amount of the small amount of reactants.

When discussing the problem of image bending and chaos of the reaction between metal and acid, it is necessary to distinguish the specific meaning of the abscissa and the ordinate in the image, which is generally the amount of hydrogen produced; There are usually two cases on the abscissa: (1) time s; (2) The mass g of the acid consumed or the mass of the metal consumed g

When two or more metals react with dilute acid, the speed of the reaction (i.e., the amount of hydrogen produced in the same time) is determined by the activity of the metal, and under the conditions of certain temperature, metal particle size and solute mass fraction of dilute acid solution, the stronger the activity of the metal, the faster the hydrogen gas is generated; The faster hydrogen is generated, the more active the metal is.

When the same mass of metal reacts with a sufficient amount of dilute acid, the maximum amount of hydrogen produced is determined by the metal, and it can be concluded through the chemical equation: when the valency of the metal is the same, for the same mass of the metal, the greater the relative atomic mass of the metal, the less hydrogen is generated; The more hydrogen gas is generated, the smaller the relative atomic mass of the metal. Buried files.

When two or more metals of equal mass react with a sufficient amount of dilute acid, when there is an excess of some metals, it must be an excess of metals with a small relative atomic mass (when the valence is equal, here al can be equivalent to 18) metals, and the metals with a large relative atomic mass are reacted first.

Why is it that the smaller the relative atomic mass, the more gas is produced? --

- Because the smaller the relative atomic mass, the greater the amount of matter.

The mass of hydrogen produced by the metal = the valency of the metal The relative atomic mass of the metal The mass of the metal, if the mass of the metal is equal and the valency of the metal is the same, then the mass of the hydrogen produced by the relative atomic mass of the metal is smaller.

In the figure above, the three metals A, B, and C have the same valency and relative atomic mass: b

When a metal reacts with an acid, the smaller the ratio of the metal to its atomic mass and its valency, the more hydrogen is produced by the reaction.

When the metal reacts with acid, the same mass of metal, according to the chemical equation, it can be found that the smaller the relative molecular mass, the more hydrogen is produced, for example, Fe and Mg react with hydrochloric acid respectively, Fe needs 56g to produce 2g of hydrogen, while mg only needs 24g to do.

The valency is related to the trim factor of the chemical equation, and the smaller the trim factor, the less reactants are needed to produce the same mass of oxygen, so as you said.