Two chemistry questions about acid salt solutions

1. AB is definitely not right, the concentration of [HPO4] is definitely the highest, and the dilution concentration of item D with water is bound to decrease.

2. The product of item b is calcium hydroxide.

Choose BA: acetic acid is a weak acid and is not completely ionized, so the concentration of hydrogen ions in acetic acid solution is lower than that of hydrochloric acid B: both are reacted with sodium hydroxide in a ratio of one to one, and the amount of sodium hydroxide of the same substance is reacted in the case of the same amount of substance.

C: Acetic acid is not completely ionized, and its ionization reaction is reversible, there is a reaction equilibrium, when diluted with water, the reaction balance of acetic acid will move, and its pH will be less than 5

d: Only the concentration of hydrogen ions in acetic acid decreases. The same is the ionization equilibrium of acetic acid, adding the corresponding sodium salt, which is equivalent to adding acetate, which will shift the equilibrium to the left and reduce the concentration of hydrogen ions.

a. Error. Because acetic acid is a weak acid, the ionization is incomplete, and when the concentration of the two is equal, the concentration of H+ acetic acid is hydrochloric acid.

b. Correct. Because the amount of the substance is the same, the amount of the substance that neutralizes oh- is the sameC. Acetic acid is not completely ionized, adding water has an effect on ionization, acetic acid is diluted 100 times, pH 5

d. Error. When sodium salt is added, the H+ concentration of hydrochloric acid remains unchanged, and the H+ concentration of acetic acid decreases. Select B

a.The concentration of hydrogen ions is not equal, hydrochloric acid is completely ionized, and acetic acid is partially ionized.

b.That's right. In the end, they all reacted completely.

c.Incorrect. Acetic acid will continue to ionize and the pH will be less than 5dIncorrect. The addition of a small amount of the corresponding sodium salt has no obvious effect on the hydrochloric acid solution.

Dilute salt mu acid is added to the NaHCO3 solution to generate sodium chloride, water and carbon dioxide, and the chemical equation of the reaction is NaHCO3 +HCl=NaCl+H2O+CO2

So the answer is: NaHCO3 +HCl=NaCl+H2 O+CO2

1.Add a piece of magnesium strip to dilute hydrochloric acid and observe the phenomenon.

Phenomenon: Violent reaction, magnesium strips dissolve, producing a large number of bubbles. The chemical equation is mg+2HCl=mgCl2+H2.

A clean iron nail is added to dilute hydrochloric acid and the phenomenon is observed. Phenomenon: The iron nail gradually dissolves, creating bubbles on the surface, and the solution gradually turns light green.

Chemical equation: Fe+2HCl=FeCl2+H2. Try to write the chemical equation for the reaction of zinc with hydrochloric acid zn+2HCl=znCl2+H2.

2.①.A rusty iron nail was added to dilute hydrochloric acid and the phenomenon was observed.

Phenomenon: The rust gradually dissolves and the solution turns yellow. Chemical Equation:

fe2o3+6hcl=2fecl3+3h2o。A small amount of copper oxide powder was added to dilute hydrochloric acid and the phenomenon was observed.

Phenomenon: Copper oxide dissolves and the solution turns blue. Chemical Equation:

cuo+2hcl=cucl2+h2o。Try to write the chemical equation for the reaction of alumina with hydrochloric acid: al2o3+6HCl=alCl3+3H2O.

Please summarize] The chemical properties of hydrochloric acid are: reaction with active metals, reaction with metal oxides. (All are the embodiment of hydrochloric acid).

The magnesium strips are dissolved, producing a colorless gas and a colorless solution is obtained.

mg + 2 HCl = mgCl2 + H2 bubbles are produced on the surface of the iron nail and the solution is light green.

Fe + 2 HCl = FeCl2 + H2 Zn + 2 HCl = ZnCl2 + H2 The rust dissolves, the surface of the iron nail becomes shiny, and the solution is yellow.

Fe2O3 + 6 HCl = 2 FeCl3 + 3 H2O The powder is dissolved and the solution is blue.

CuO + 2 HCl = CuCl2 + H2OAL2O3 + 6 HCl = 2 ALCl3 + 3 H2O reacts with metal to obtain hydrogen and salt.

React with metal oxides to obtain salt and water.

1) There are bubbles coming out 2HCI MG=H2 (gas symbol) Mgci2 bubbles coming out 2HCI FE=H2 (gas symbol) FECI22HCI Ze=H2 (gas symbol) ZECI22) The solution turns yellow Fe2O3 6HCI=2FECI3 3H2O solution turns blue CUO 2HCI=CUCI2 H2OAI2O3 6HCI=2ACI3 3H2O Nature 1 Strong acidity, reacts with alkali to form chloride and water.

2. It can react with carbonate to generate carbon dioxide.

3. It can react with active metal elements to generate hydrogen.

4. It can react with metal oxides to generate salt and water.

5. Hydrochloric acid is commonly used in laboratories to produce carbon dioxide.

1. The conditions for this question are insufficient, what is the reaction with hydrochloric acid, and what is the amount?

2. If it is a sufficient amount of calcium carbonate, the solute in the solution obtained after the reaction is calcium chloride.

3. If it is an appropriate amount of sodium hydroxide, the solute is sodium chloride.

Wrong, it should be c3>c1=2c2.

According to pH=-LG(H+), two acid solutions with the same pH must have the same concentration of H+ in the solution.

Let's start with c1=2c2

Since hydrochloric acid is a monobasic strong acid, and sulfuric acid is a dibasic strong acid, the concentration of hydrochloric acid is 2 times that of sulfuric acid, so C1=2C2

Compare C1 with C3

Acetic acid, as a single weak acid, can only be partially ionized, so if the H+ concentration in the acetic acid solution is equal to that of hydrochloric acid, the concentration of acetic acid must be greater than that of hydrochloric acid, so C3>C1

Synthetically C3>C1=2C2

If it's high school content, the answer should be.

c3＞c1=2c2

Because acetic acid is a weak electrolyte, it is not completely ionized, and only a small part of the ionization is produced, so the total concentration is maximum.

In high school, it is believed that hydrochloric acid is completely ionized, and sulfuric acid is also completely ionized. Hydrochloric acid and sulfuric acid have the same pH, that is, the concentration of hydrogen ions is equal.

The concentration of hydrochloric acid is the concentration of hydrogen ions.

The concentration of sulfuric acid is hydrogen ion concentration 2.

So c1=2c2

The answer is C3>C1>2 times C2

With the same pH value, the highest concentration of weak acid, sulfuric acid is 12 times the concentration of hydrochloric acid of dibasic acid, so it is the above result C1

c2c3