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Thread: Molars to PPM Salt (NaCl) Calculation

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    Molars to PPM Salt (NaCl) Calculation

    This question is I think something chem geek will be able to answer, or others among you who are chemistry geeks.

    The reason for this question is that it relates to another question regarding saltwater pools that I want to ask, but I want to make sure I am calculating correctly.

    So here are two question:

    If NaCl (Salt) has a molar mass of 58.44276 would 1.7 M of NaCl, in a 10,000 gallon pool, equate to 2624 ppm, and would 2 M of NaCl, in a 10,000 gallon pool, equate to 3088 ppm?

    Thank you to those that can answer.
    10,000 gal plaster pool,3/4 hp WhisperFlo pump, Sta-Rite Great White GW9500 pool cleaner, Hayward 300 lb Sand Filter
    Use Magenta Stuff for Iron and Silica control.
    Balance: pH 7.7 Cl 7 -8 Alk 70-80 CH 325 CyA 30 in winter - 50 in summer NaCl 1010 TDS 1200

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    linen's Avatar
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    Re: Molars to PPM Salt (NaCl) Calculation

    If you mean Molarity (which equals moles/L) then:

    (1.7mol/L)*(63.55g/mol)*(1000mg/g)= 108305 mg/L= 108305 ppm or 10.83%
    (2.0mol/L)*(63.55g/mol)*(1000mg/g)= 127100 mg/L= 127100 ppm or 12.71%

    If instead of the above, you mean moles (not Molarity) then:

    (1.7 mol)/(10000g)*(10000g/37854.1L)*(63.55g/mol)*(1000mg/g)= 285.3 mg/L = 285.3 ppm
    (2.0 mol)/(10000g)*(10000g/37854.1L)*(63.55g/mol)*(1000mg/g)= 335.7 mg/L = 335.7 ppm
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Molars to PPM Salt (NaCl) Calculation

    Why are you dealing with moles or molarity (moles per liter)? Don't you just want to know the concentration of salt in the pool when you add a certain amount to it? Or you want to know how much to add to get to a certain salt level? For either of those questions, you can use The Pool Calculator.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Re: Molars to PPM Salt (NaCl) Calculation

    linen,

    Than you for your reply.

    I meant Molarity (which equals moles/L), and as the numbers are different from what I thought they might be I have no question to ask.

    chem geek,

    No, the question was for another reason, but as the numbers are different there is no question to ask. To check my salinity I use strips which were always close to the Taylor's salt test kit. Taylors salt test can no longer be legally shipped to Hawaii due, according to Taylor, new Federal regulations, nor can the iron test for the same reason.

    Thank you both for your reply.
    10,000 gal plaster pool,3/4 hp WhisperFlo pump, Sta-Rite Great White GW9500 pool cleaner, Hayward 300 lb Sand Filter
    Use Magenta Stuff for Iron and Silica control.
    Balance: pH 7.7 Cl 7 -8 Alk 70-80 CH 325 CyA 30 in winter - 50 in summer NaCl 1010 TDS 1200

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    Patrick_B's Avatar
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    Re: Molars to PPM Salt (NaCl) Calculation

    I'm guessing it's the Chromate in the salt test, but what is in Taylor's Iron kit?
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