Larus99 Posted August 3, 2019 Share Posted August 3, 2019 Hello! I want to ask how much oleum (20% SO3) and water should be mixed to make concentrated H2SO4? Thanks! Link to comment Share on other sites More sharing options...
chenbeier Posted August 3, 2019 Share Posted August 3, 2019 (edited) If you have 1 kg Oleum (20% SO3 dissolved in 100% H2SO4) then you have 200 g of sulfur trioxide and 800 g sulfuric acid. With the molare weight of 80 g/mol for SO3 you get 2,5 mol. You need also 2,5 mol water according H2O + SO3 => H2SO4 . This is equal to 45 g. So take 45 g = 45 ml water first!! and add carefully the Oleum. Edited August 3, 2019 by chenbeier Link to comment Share on other sites More sharing options...
Larus99 Posted August 3, 2019 Author Share Posted August 3, 2019 Thank you! Link to comment Share on other sites More sharing options...
John Cuthber Posted August 4, 2019 Share Posted August 4, 2019 Given the extremely violent reaction of oleum with water it's probably better to add the oleum to ice. It may also be a better bet to let it absorb water from the air (until it gains the right mass), but the fumes would be a problem. Fundamentally, if you can't do basic chemistry like the calculation above, you shouldn't be working with oleum. 1 Link to comment Share on other sites More sharing options...
Recommended Posts
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 accountSign in
Already have an account? Sign in here.
Sign In Now