Jump to content

98% of H2SO4 solution


sheanhung

Recommended Posts

I have problem to determine the molarity of H2SO4 from 95%-98% H2SO4 solution with volume of 2.5 L stated on the bottle.

 

Besides, i am not sure what is the meaning of 95%-98%. Is this percentage is in term of volume, number of moles or weight of H2SO4?

 

If the molarity above is obtained, suppose i mix 1 volume this H2SO4 with 2 volume of water, what is the new molarity and number of moles of the diluted solution?

 

These problems are killing me. :confused: :confused: :-( Please help~!

 

 

*Are these informations useful?*

density of H2SO4 = 1.841 g/cm3

Molecular mass of H2SO4 = 98.08 g/mol

Link to comment
Share on other sites

98%

means that the H2SO4 has 98% of the total weight of a sample of H2SO4 solution.

 

In order to find out the molarity of the sulphuric acid,

there's a pretty good method.

Find out how many moles of H2SO4 are there in 1 dm^3 of water.

Then it is equal to the molarity of the acid.

what is the new molarity and number of moles of the diluted solution?

Molarity= no. of mole of a substance / volume of solution.

Since there's no departure of any H2SO4 molecules,

it follows that there exists the amount of H2SO4 molecules.

In this case , the molarity decreases as a result of the decrease in Volume of the solution

Link to comment
Share on other sites

I have calculated the molarity of the solution = 18 M

 

After dilution, the new molarity is roughly 6M. However, is this possible to use this diluted solution outside fume cupboard? What i understand is 6M is too concentrated to be used outside fume cupboard.

 

But, during my experiment, this diluted solution was placed on the bench only. Hmm......i think i have make mistake in calculation!

Link to comment
Share on other sites

After dilution' date=' the new molarity is roughly 6M. However, is this possible to use this diluted solution outside fume cupboard? What i understand is 6M is too concentrated to be used outside fume cupboard.

[/quote']

I suppose technically, you could use even an 18M solution of H2SO4 outside a fume hood, depending on the type of experiment you are using it for. Of course, it's not recommended, but not everyone has access to a fume hood.

Link to comment
Share on other sites

What does this mean?

You didn't use the diluted solution?

 

The H2SO4 put on the bench is diluted solution already. Diluted solution is made by mixing 1 volume of H2SO4 and 2 volume of H2O. (Eg. 5mL of H2SO4 + 10mL of H2O). The molarity of the diluted H2SO4 should be 6M if the formula MV = MV is applied. Am i correct?

 

If yes, is 6M of H2SO4 safe to use outside fume cupboard? (From mt knowledge, 6M is very concentrated too!)

 

:rolleyes:

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.