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Question by  angille (55)

# How do you determine initial concentration in molarity?

I am having a hard time understanding the equation for initial concentration in molarity.

 +1 vote! +7 you voted Answer by  shobby (42) Molarity is the number of moles of solute/litre of solution. Therefore, molarity m = n/v * 1000, where n = number of moles, v = volume of solution. To find out number of moles n = Weight of the solute/Number of moles, so m = w/m / v*1000

 +1 vote! +6 you voted Answer by  anrimala36 (208) Molarity = moles solute / liters solution, so if you have 29.2g NaCl (solute) in 500mL water (solvent): molarity = (29.2g/(58.4/mol)/(500mL*(1L/1000mL)=1M. Water is usually the solvent.

 +1 vote! +5 you voted Answer by  fishy (1085) Molarity is calculated by adding the total of the atomic weights of all elements in any given compound and multiplying that number by grams of the compound used to obtain mols per liter.

 +1 vote! +5 you voted Answer by  worker7041 (64) you need the total amount of solute dissolved in the solution and the volume of the solution. Then, the concentration = amount of solute / volume of solution

 +1 vote! +4 you voted Answer by  Matt09 (25) Molarity is moles of solute(the substance you have less of) divided by moles of liters of solvent(what you have the most of, often water). For example, if you add 88 grams of carbon dioxide to 1 liter of water you must convert the grams to moles then divide by the liters. 88/44=2 moles then 2/1= 2 molarity.