What volume of the gas absorbed by the alkali ?

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In summary: Now, what happens when CO2 reacts with KOH? And how much CO2 do we have in total?In summary, when a mixture of 10cm^3 of methane and 10cm^3 of ethane is sparked with excess oxygen and cooled to room temperature, the resulting gas is passed through aqueous potassium hydroxide. The CO2 produced from the combustion of methane and ethane will react with the KOH, resulting in the absorption of all or most of the CO2. The balanced equations show that for every 1 mole of methane and 2 moles of ethane combusted, 30 cm^3 of CO2 is produced. Therefore, the total volume of gas absorbed by the alkali is
  • #1
terainfizik
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Homework Statement



A mixture of 10cm^3 of methane and 10cm^3 of ethane was sparked with an excess oxygen . After cooling to room temperature , the residual gas was passed through aqueous potassium hydroxide

What volume of the gas absorbed by the alkali ?

Homework Equations



N/A

The Attempt at a Solution


I have no idea for the solution . Any hint ?
 
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  • #2
what are the results of 'sparking' methane and ethane with oxygen? i.e. what are the products of combustion?
 
  • #3
Water and carbon dioxide . I think . So..?
 
  • #4
And what kind of gas is carbon dioxide? What happens when you pass such a gas through an alkaline solution like KOH?
 
  • #5
Gokul43201 said:
And what kind of gas is carbon dioxide? What happens when you pass such a gas through an alkaline solution like KOH?


I have no idea . Guide pls .
 
  • #6
KOH is a base. What do bases (or basic/alkaline solutions) react with?
 
  • #7
I only know that acid react with base will produce water and salt .
 
  • #8
Good, then keep in mind that CO2 is an acidic oxide. It is something like an acid, minus the water. It too, will react with a base, forming a salt. The point of this is to recognize that when you pass a gaseous mixture containing CO2 through a solution of KOH, all (or a very large part of) the CO2 will be removed by this reaction.

Write down and balance the equations for the combustion of ethane and methane. How much CO2 is produced from the given quantities?
 
Last edited:
  • #9
I think the equation is as below :

For methane combustion :
CH4 + O2 ---> CO2 + H2O
Since 1 mole of CH4 : 1 mole of CO2
SO: 10CM^3 CH4 will gives 10 cm^3 CO2

For ethane combustion :
C2H6 + O2 ---> CO2 + H2O
Since 1 mole of C2H6 : 1 mole of CO2
So: 10cm^3 C2H6 will gives 20 cm^3 CO2Total gas has absorbed is 30 cm^3 ?
Am I correct ?
 
Last edited:
  • #10
You have not balanced the equations. You need to do that before you determine the mole ratios.
 
  • #11
terainfizik said:
I think the equation is as below :

For methane combustion :
CH4 + O2 ---> CO2 + H2O
Since 1 mole of CH4 : 1 mole of CO2
SO: 10CM^3 CH4 will gives 10 cm^3 CO2

For ethane combustion :
C2H6 + O2 ---> CO2 + H2O
Since 1 mole of C2H6 : 1 mole of CO2
So: 10cm^3 C2H6 will gives 20 cm^3 CO2Total gas has absorbed is 30 cm^3 ?
Am I correct ?
{EDIT}
For methane combustion :
CH4 + 3O2 ---> CO2 + 2H2O
Since 1 mole of CH4 : 1 mole of CO2
SO: 10CM^3 CH4 will gives 10 cm^3 CO2

For ethane combustion :
C2H6 + 7/2O2 ---> 2CO2 + 3H2O
Since 1 mole of C2H6 : 2 mole of CO2
So: 10cm^3 C2H6 will gives 20 cm^3 CO2 ?

so
total volume is 30cm^3 ?
 
  • #12
Looks good.
 

What volume of the gas absorbed by the alkali ?

1. What is the definition of alkali gas absorption?
Alkali gas absorption is the process in which an alkali gas is dissolved or absorbed into a liquid solution.

What volume of the gas absorbed by the alkali ?

2. How is the volume of gas absorbed by alkali determined?
The volume of gas absorbed by alkali is determined by measuring the difference in volume before and after the gas has been absorbed into the solution.

What volume of the gas absorbed by the alkali ?

3. What factors affect the volume of gas absorbed by alkali?
The volume of gas absorbed by alkali can be affected by factors such as temperature, pressure, concentration of the solution, and the type of gas and alkali being used.

What volume of the gas absorbed by the alkali ?

4. How does the volume of gas absorbed by alkali relate to the concentration of the solution?
The volume of gas absorbed by alkali is directly proportional to the concentration of the solution. As the concentration increases, more gas can be absorbed by the solution.

What volume of the gas absorbed by the alkali ?

5. Why is it important to know the volume of gas absorbed by alkali?
Knowing the volume of gas absorbed by alkali is important for various industrial and scientific purposes, such as in chemical reactions, gas purification processes, and in the production of certain products.

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