Sciencemadness Discussion Board

Working out concentration

captainC11 - 18-3-2019 at 13:42

If a solution of 50ml weighs 59.44g in water and water weighs 50g at 50ml what will the percentage be of the solution eg 55 percent etc?

Ubya - 18-3-2019 at 16:19

not that easy, you need to know what is the solution first, liquid volumes are not additive (for example 50ml ef ethanol plus 50 ml of water doesn't give a 100ml solution )

CharlieA - 18-3-2019 at 16:25

Quote: Originally posted by captainC11  
If a solution of 50ml weighs 59.44g in water...

What does "weighs 59.44 g in water" mean?

Sigmatropic - 18-3-2019 at 21:44

For most acids there are charts where one can look up what density corresponds to what concentration. the last pages of Vogel's practical organic chemistry have several tables.

Alternative is to make such a chart yourself.

Sometimes though this data is available online.

Also as soon as you know the density of a saturated solution and how many g / 100 mL water (not the same as %w/v!) a saturated solution is you could assume linearity and calculate your concentration based on density.

Or to take say 10 mL and boil that dry.

captainC11 - 20-3-2019 at 00:37

Quote: Originally posted by CharlieA  
Quote: Originally posted by captainC11  
If a solution of 50ml weighs 59.44g in water...

What does "weighs 59.44 g in water" mean?


What I mean if 50ml of this solution weighs 59.44 what’s the concentration . The solution is acid and water

Cheers

Ubya - 20-3-2019 at 04:30

Quote: Originally posted by captainC11  
Quote: Originally posted by CharlieA  
Quote: Originally posted by captainC11  
If a solution of 50ml weighs 59.44g in water...

What does "weighs 59.44 g in water" mean?


What I mean if 50ml of this solution weighs 59.44 what’s the concentration . The solution is acid and water

Cheers


If I have a shopping bag and it weights 3kg how many apples are in there?
This is how your question sounds. You CAN'T know the concentration with only volume and weight data (aka density), 30% HCl has not the same density as 30% sulphuric acid or acetic acid. If you still don't want to tell WHAT acid is in your solution we simply can't help.
Cheers:P