The laboratory reacts with metallic zinc and dilute sulfuric acid to produce hydrogen, which now req

zn+h2so4=znso4+h2↑

x*10%98/2=x*10%/

x = 98g The required 10% of the mass of sulphuric acid is 98 grams;

98g*10%=y*98% y=10g water demand=98g-10g=88g

If there is only 98% concentrated sulfuric acid, 10 grams of 98% concentrated sulfuric acid and 88 grams of water are required.

zn+h2so4==znso4+h2↑

x98/x = 2/

x = requires 10% sulfuric acid mass = = 98g

It should be how to dilute concentrated sulfuric acid to get 10% dilute sulfuric acid.

If 98% concentrated sulfuric acid is used, the mass of concentrated sulfuric acid = = 10g is required, and the mass of water = 98-10 = 88g is required

zn + h2so4 === znso4 + h2↑x

98/x=2/

x = 10% of the required sulfuric acid mass is.

If there is only 98% concentrated sulfuric acid, you need concentrated sulfuric acid water 98g-10g=88g

Solution: According to the chemical equation of the reaction between zinc and dilute sulfuric acid, the mass of 10% of the required sulfuric acid can be obtained from the mass of hydrogen. Then, according to the principle of invariant solute quality, the mass of concentrated sulfuric acid and water required 98% is obtained

1) The mass of 10% of the sulfuric acid required for the reaction is x

zn+h2so4=znso4+h2↑

x 10% x 10% solution: x = 98g

2) Set the mass of 98% concentrated sulfuric acid required to be y

y 98%=98g 10% solution: y=10g

The quality of water required is 98g-10g=88g

Answer: (1) The mass of 10% sulfuric acid required for the reaction is 98g; (2) If there is only 98% concentrated sulfuric acid, the quality of concentrated sulfuric acid required for the preparation reaction is 10g, and the quality of water is 88g

2,zn+h2so4=znso4+h2

x98/x=2/

x=1) The required 10% of the mass of sulfuric acid is.

2) If 98% concentrated sulfuric acid is used, ask how much quality of concentrated sulfuric acid and water is needed.

Concentrated sulfuric acid water 98g-10g=88g, 1,1)ZN+H2SO4=ZN+H2 2) According to the first question, 98% concentrated sulfuric acid is 10g

1 : 1 : 1:1 water level difference.

n(h2)=m/m= ..1. Grams of hydrogen sulfuric acid.

1) 2) 98% concentrated sulfuric acid does not react with zinc to form hydrogen, so it must be diluted to a certain concentration to produce hydrogen.

Just use the first question.

10g of concentrated sulfuric acid dilution water 98-10 = 88g, 0, the laboratory uses metal zinc and dilute sulfuric acid reaction to produce hydrogen, and now hydrogen is to be produced.

1) What is the mass of 10% of sulfuric acid required for the reaction?

2) If there is only 98% concentrated sulfuric acid, how much mass of concentrated sulfuric acid and water is needed to prepare the dilute sulfuric acid required for the reaction?

Hydrogen rises, so the amount of hydrogen substance is moles.

List chemical equations.

zn+h2so4=znso4+h2

x yx=y=

So the zinc mass is grams.

Zinc sulfate grams. Good luck with your studies!

zn + h2so4 = h2 + znso41 1 1x yy=

x=I haven't done chemistry in a long time. I don't remember very much. I don't know if it's right.

"First of all, why zn is used From the metal activity order table, it can be seen that the activity of zn is neither high nor low (just a little before h), so that the rate of reaction with acid to form h2 is appropriate, which is convenient for collection.

Why use dilute sulfuric acid There are three main acids in middle school Sulfuric acid, hydrochloric acid and nitric acid Among them, hydrochloric acid is volatile when heated, and the purity of H2 is produced due to the exothermic effect of the reaction to affect the volatilization of HCL Nitric acid, even if it is dilute nitric acid, it has strong oxidation, that is to say, it reacts with Zn to mainly produce NO and NO2 Concentrated sulfuric acid If you want to explain it in depth, there are many reasons, and it is not yet understandable in the junior high school stage, so it can only be said that the generated zinc sulfate covers the surface of zinc and hinders the continuation of the reaction Therefore, dilute sulfuric acid is used.

And a little bit more off-topic, when you do the question, you have to choose an acid reaction, and the order of consideration must first consider whether you can use dilute sulfuric acid, there is a sentence that you can use sulfuric acid, not hydrochloric acid, and use nitric acid with caution"

Zn is used first because if the reaction is too fast with mg, it is too slow with fe. The ZN speed is moderate, which is convenient for gas collection. Dilute sulfuric acid is then used instead of hydrochloric acid because hydrochloric acid is volatile and affects the purity of the gas.

The time for zinc and dilute sulfuric acid to produce hydrogen is neither fast nor slow, and it is convenient to collect.

"Why use zn in the first place

According to the table of metal activity sequence, the activity of Zn is neither high nor low (just a little before H), which makes the rate of reaction with acid to form H2 appropriate, which is convenient for collection.

Why dilute sulfuric acid.

There are three main acids in secondary school.

sulfuric acid, hydrochloric acid and nitric acid.

Among them, hydrochloric acid is volatile when heated, and due to the exothermic reaction to volatilize HCl, the purity nitric acid of H2 is affected, and even the dilute nitric acid has strong oxidation, that is to say, it reacts with Zn to mainly produce NO and NO2

There are many reasons for the concentrated sulfuric acid to be explained in depth, and it is not yet understandable at the junior high school stage, so it can only be said that the generated zinc sulfate covers the zinc surface and hinders the continuation of the reaction.

Therefore, dilute sulfuric acid is used.

A little more off topic.

When you do the problem, you are asked to choose an acid reaction.

The order of consideration must first consider whether dilute sulfuric acid can be used.

There is a saying. Sulfuric acid can be used, no hydrochloric acid, nitric acid should be used with caution"

The laboratory uses zinc and dilute sulfuric acid to produce hydrogen, and at the same time generates zinc sulfate, and the chemical equation of the reaction is: Zn+H2

so4znso4

h2；This reaction is a reaction in which an element and a compound react to produce another element and another compound, which is a displacement reaction

So the answer is: zn+h2

so4znso4

h2；Displacement reaction

If the mass of H2SO4 is x grams, the dilute sulfuric acid is required to be y grams.

Zn+H2SO4=ZnSO4+H2 gas filial piety.

x65 rotten x=g.

Mass fraction = solute mass of the solution.

yy = grams.

Handsome Wolf Hunting] team to help you answer".<

The reaction of zinc and sulfuric acid to produce hydrogen is as follows:

Grams of hydrogen are known to be generated. Let the reaction consume Zn x g and consume H2SO4 y g.

zn + h2so4 ====znso4 + h2↑x y

We get two equations : 65 x=2 98 y=2 ===>x= y=

So the reaction needs to consume grams, grams of sulfate! ~

Satisfied! ~

The chemical formula is: Zn + H2SO4 = ZnSO4 + H2

Atom, molecular weight: 65 98 161 2

To produce grams of hydrogen, grams of zinc and grams of sulfuric acid are required.