18 posts • Page 1 of 1
Molarity is basically the measure of the concentration of a solution in moles of a solute (which is the substance being dissolved) over the liters of solution (which is the substance the solute is being dissolved in). Something helpful about molarity is that if it is given, it can be used to find unknown amounts of solvent or solute.
Molarity is a measure of the concentration of a chemical species in a solution. It is telling you how many moles of a chemical species there are in a single liter of solution. It can be used to find many different values in relation to a chemical reaction if it is done in a solution.
Molarity is also important for dilution problems because it can be used in the equation (Minitial)(Vinitial)=(Mfinal)(Vfinal) to determine concentrations, volumes, or moles of the solute before or after the solution has been diluted.
With regards to molarity when diluting a solution, it is important to remember that the moles of solute remain the same. The unknown volume or mass can be computed by plugging known values into: M(initial)xV(initial) = M(final)xV(final)
Molarity's importance lies in how it defines the concentration of the solution and acting as a measurement of moles of solute per liter of solution. It is a big part of dilution calculations since moles of solute stay the same, so it is easy to calculate the molarity when knowing how much solution was added.
Most of the time in chemistry, you will be using moles to compare two elements, compounds, or solutions. Considering this, the M1V1 = M2V2 comes from. Molarity = moles/volume so you are comparing the moles in the form of Molarity1*Volume1 = Molarity2*Volume2
Molarity is number of moles per liter of solution. Molarity is important in experiments because it acts like the specific dosage that is needed in different reactions. Different molarity may result in different amount of products in a reaction.
Claire Lo 3C wrote:Does anyone know the difference between molarity and molality?
Molarity is moles of solute per liter of solution(mol/L). Molality is the moles of solute per kilogram of solvent (mol/kg). While both have the same values in the numerator, they differ in the denominator. For the denominator of molarity, you are looking at the combined volume of the solvent and solute, or the total solution. For molality, you are only looking at the mass of the solvent.
Hi! just to add on to the post above, molarity is notated with symbol M while molality is notated with symbol m. Molarity, the moles of solute per liter solution, and molality, the moles solute per kilogram solvent, is similar to each other in room temperature aqueous solutions. The molality measurement is often used for solutions with temp change.
Who is online
Users browsing this forum: No registered users and 2 guests