what are concentrations of species in 0.04M sodium sulfate in water?

sarah1004 · #1 Nov 2, 2009, 08:42 AM

I am confusing on this problems.
Could you please help me that how to do this one?

Thanks

Unknown008 · Nov 2, 2009, 08:51 AM

0.04 M means 0.04 moles of the compound in 1000 mL of water

0.5 M means 0.5 moles of compound in 1000 mL

etc etc.

M is also moles per litre, so it makes xx moles in 1 litre, or in 1000 mL

sarah1004 · Nov 2, 2009, 08:55 AM

so if i used L

its gonna be 0.040mol/1000L=0.00004M?

Thanks

Unknown008 · Nov 2, 2009, 08:59 AM

Oh no! You missed my point!

It's 0.04 moles in 1 litre, which means 0.04 moles in 1000 mL, since 1L = 1000mL

Unknown008 · Nov 2, 2009, 09:01 AM

Now the one you posted, 0.04 mol/1000L yes, that would make 0.00004M

sarah1004 · Nov 2, 2009, 09:02 AM

so 0.040mol/1mL=0.04M
0.040mol/1000L=0.00004M

sorry

Unknown008 · Nov 2, 2009, 09:06 AM

Lol!!!

Ok, I think you better forget what I told you.

0.04 M = 0.04 mol in 1000 mL
1.0 M = 1 mol in 1000 mL
0.005 M = 0.005 moles in 1000 mL

sarah1004 · Nov 2, 2009, 09:12 AM

so 0.040mol/1L=0.04M
0.040mol/1000mL=0.00004M

Unknown008 · Nov 2, 2009, 09:15 AM

No, if you put 0.04 mol/1000 mL, you have 0.04 M

sarah1004 · Nov 2, 2009, 09:18 AM

40mole/1000mL=0.04M

?