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#1
04-25-2010, 04:57 PM
 jenna Junior Member Join Date: Apr 2010 Posts: 1 Rep Power: 0
calculate meq/L

how do you solve: If 2.29g of phosphate are in 1284 ml of solution, what is the phosphate in meq/L?
#2
04-25-2010, 05:19 PM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,217 Rep Power: 18
Re: calculate meq/L

Quote:
 Originally Posted by jenna how do you solve: If 2.29g of phosphate are in 1284 ml of solution, what is the phosphate in meq/L?
The molar mass of the phosphate ion is 94.973 g/mol, and the charge is -3, hence 3 eqv per mole.

2.29 g/1.284 L x 1 mol/94.973g = 18.8 mmol/L
Multiple by 3 for meq/L, 56.3 meq/L
#3
09-14-2010, 09:35 AM
 Unregistered Guest Posts: n/a
Re: calculate meq/L

how many mg of potassium are there in 4 liters of a solution that is 3mEq/L.? please help!
#4
09-14-2010, 11:28 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,217 Rep Power: 18
Re: calculate meq/L

Quote:
 Originally Posted by Unregistered how many mg of potassium are there in 4 liters of a solution that is 3mEq/L.? please help!
Charge of K+ ion is 1, so 1 Eq = 1 mol
Molar mass of K is 39.0983 g/mol

3 meq/L x 4 L x 1 mol/eq x 39.0983 g/mol = 469 mg/L
#5
03-28-2012, 08:53 PM
 Unregistered Guest Posts: n/a
Re: calculate meq/L

Quote:
 Originally Posted by jenna how do you solve: If 2.29g of phosphate are in 1284 ml of solution, what is the phosphate in meq/L?
2290mg/1.284L = 1783.5mg/L
1/miliequivalent weight
1/1783.5
=0.00056meq/L
#6
03-29-2012, 11:36 AM
 Mrs X can't count, can't spell! Join Date: Feb 2006 Location: New Zealand Posts: 2,379 Rep Power: 11
Re: calculate meq/L

Quote:
 Originally Posted by Unregistered 2290mg/1.284L = 1783.5mg/L 1/miliequivalent weight 1/1783.5 =0.00056meq/L
Phosphate is PO4, and depending on how far you are reducing it, you need 2, 4, 5, or 8 electrons per phosphate molecule to balance an electronic equation, as phosphorus has several different stable oxidation states.

One of the issues with using milliequivilents, which seem to have come back into fashion.
#7
06-19-2012, 07:41 AM
 registered Guest Posts: n/a
Re: calculate meq/L

2460 mg/l of sodium converted to meq/l what is the value
#8
06-19-2012, 08:04 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,217 Rep Power: 18
Re: calculate meq/L

Quote:
 Originally Posted by registered 2460 mg/l of sodium converted to meq/l what is the value
If that is just the concentratuion of the sodium ion, divide by 22.99 g/mol = 107 mmol/L (or meq/l for sodium ion, which has charge of +1)
#9
09-19-2012, 06:19 PM
 Unregistered Guest Posts: n/a
Re: calculate meq/L

Quote:
 Originally Posted by JohnS The molar mass of the phosphate ion is 94.973 g/mol, and the charge is -3, hence 3 eqv per mole. 2.29 g/1.284 L x 1 mol/94.973g = 18.8 mmol/L Multiple by 3 for meq/L, 56.3 meq/L
there's also a quote of 0.00056 meq/L

Which is it?
#10
12-19-2012, 07:08 AM
 saurabh naik Guest Posts: n/a
Re: calculate gm/lit

can you show me the calculation to convert 14.13meq/lit to gram/lit

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