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  #1  
Old 04-25-2010, 03:57 PM
jenna jenna is offline
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Default 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?
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  #2  
Old 04-25-2010, 04:19 PM
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Default Re: calculate meq/L

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Originally Posted by jenna View Post
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
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  #3  
Old 09-14-2010, 08:35 AM
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Default Re: calculate meq/L

how many mg of potassium are there in 4 liters of a solution that is 3mEq/L.? please help!
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Old 09-14-2010, 10:28 AM
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Default Re: calculate meq/L

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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
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  #5  
Old 03-28-2012, 07:53 PM
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Default Re: calculate meq/L

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Originally Posted by jenna View Post
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
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  #6  
Old 03-29-2012, 10:36 AM
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Default Re: calculate meq/L

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Originally Posted by Unregistered View Post
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.
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Old 06-19-2012, 06:41 AM
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Default Re: calculate meq/L

2460 mg/l of sodium converted to meq/l what is the value
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Old 06-19-2012, 07:04 AM
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Default Re: calculate meq/L

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Originally Posted by registered View Post
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)
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  #9  
Old 09-19-2012, 05:19 PM
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Cool Re: calculate meq/L

Quote:
Originally Posted by JohnS View Post
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?
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  #10  
Old 12-19-2012, 06:08 AM
saurabh naik
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Default Re: calculate gm/lit

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