What is Molarity: Definition and 114 Discussions

Molar concentration (also called molarity, amount concentration or substance concentration) is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of solution. In chemistry, the most commonly used unit for molarity is the number of moles per liter, having the unit symbol mol/L or mol⋅dm−3 in SI unit. A solution with a concentration of 1 mol/L is said to be 1 molar, commonly designated as 1 M. To avoid confusion with SI prefix mega, which has the same abbreviation, small caps ᴍ or italicized M are also used in journals and textbooks.

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  1. L

    Archived Calculating molality given density and molarity

    I haven't taken chemistry in over 3 years so I have forgotten a lot of the very basic concepts (even while understanding the higher level stuff) and am having problems with this simple thing! Please help :(. Question 1- At 20°C, a 2.32 M aqueous solution of ammonium chloride has a density of...
  2. A

    Calculating Molarity of Sulfuric Acid Solution

    I just wanted to see if I'm doing this right. Sulfuric acid is supplied as a concentrated liquid. A bottle was assayed and found to have a density of 1.84 g/mL and a purity of 97%. The molecular weight of H2SO4 is 98. What is the molarity of this solution? molarity=moles/volume...
  3. M

    How Do You Calculate the Final Concentration of a Mixed HCl Solution?

    200 ml of a 6 M HCl solution is added to 400ml of a 1.50 M HCl solution. find the concentration of the mixture. here is what I think should be done: (6M)(V concentration)=(.8L)(1.50M) can i add the two volumes together? Is this correct?
  4. P

    Molarity Notation: What Does TiA ^{-1} Mean?

    What does the following notation (to the power of -1) mean? TiA ex. [Na] = 0.050 mol L ^{-1}
  5. M

    Calculate the molarity of Br2 in the stock solution.

    The stock solution of bromine is prepared by dissolving 232.5 g of Br2 and 187.5 g of KBr in water and diluting to 750 ml. Calculate the molarity of Br2 in the stock solution. how to do this qs?
  6. D

    What is the molarity of 29.25 g of NaCl in 700mL of solution?

    Havin a little trouble: Calculate the molarity of 29.25 g of NaCl dissolved in 700ml of total solution in moles per litre. I know that 1 mol of salt is 57 g so 29.25 g of salt is ~0.51 mol... But then what? Is the answer ~0.35 mol/700L ? I cross multiplied. Thanks
  7. M

    Salt Levels: Why High Molarity Can't Support Marine Life

    Bodies with high molarity of salt (salt levels) cannot sustain marine life? but why? please help. thanks!
  8. C

    Solution Concentration: Molarity

    Hello all I just need confirmation as to whether I am performing this problem correctly: How would you prepare 1.00 L of a 0.50 M solution of HCl from a 12M stock reagent? My solution: 1.00 L * (0.5 mol HCl/ L solution) = 0.5 mol HCl V * (12 mol HCl / L solution) = 0.5 mol HCl...
  9. X

    Calculate the molarity, M, of the NaOH

    An amount of potassium acid phthalate (KHP) weighs 0.426 g. The KHP is dissolved in a small amount of water and titrated with 16.98 mL of NaOH. Calculate the molarity, M, of the NaOH. The following is my answer, but it was wrong. Can anyone help? Thanks Molecular weight of KHP = 71.08...
  10. N

    Calculate Molarity of Cl- in Solution

    A Cl solution with a volume of 13.53 mL was treated with 30.0 mL of Cr3+ solution (containing excess Cr3+) to convert to hexachlorochromateIII: 6Cl- + Cr ----- Cr(Cl)6 The excess Cr3+ was then tirated with 11.85 mL of 0.01280 M (en) according to equation: Cr + 3en...
  11. wasteofo2

    Checking my understanding of Molarity.

    Ok, I just started chemistry last tuesday, and I want to check my understanding of the concept of Molarity. Let's use Carbon as an example, which has an atomic weight of 12.0107 atomic mass units. But that's too small to be of any practical use, so whoever figured out that if you have 1 Mole...
  12. N

    How Do You Calculate Molarity in Diluted Solutions?

    Lets say you pipet into a 250 mL volumetric flask the following: 10 ml of 3e-4 M bromscresol green solution 25 mL of 1.6 M acetic acid (HC2H3O2) 10 mL of .200 M KC1 Solution and diluted to the 250 mL mark What is the molarity of acetic acid in this solution? Do you calculate the...
  13. K

    Molarity Questions: Calculate Resulting Solutions

    What is the molarity of each resulting solution when the following mixtures are prepared? 553.6 mL H2O is added to 20.0 mL 4.79 M HNO3 20.8 mL 1.75 M HCl is added to 80.0 mL 0.534 M HCl
  14. F

    Molarity of Sulfuric Acid Solution: 15.206 M

    Is this how you work this problem: A sulfuric acid solution has a density of 1.49 g/mL and contains 59 percent H2SO4 by mass. what is the molarity of this solution? .59x98g = 57.82g H2SO4 1mL/1.49g x 57.82g H2SO4 = .0388L 57.82g H2SO4/ 98g H2SO4 = .59 mol .59 mol/.0388L = 15.206 M...
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