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Molarity represents the concentration of a solution (specifically the number of moles of solute per liter of solution). You would need to calculate molarity in a wide variety of various situations, including calculating the moles of a solution, calculating the volume of a solution, calculating the moles and / or volume of a solution before and / or after dilutions, etc.
Molarity can be used to figure out the concentration of the solute in the solution. It can be calculated when doing a lab to get the correct concentration of a solution. it is also helpful if given molarity as a variable you can either solve for Liters or moles of a substance depending on what else is given.
Molarity is used to calculate the concentration of of molecules in a solution. It is useful when you want to find the strength of a solution or when you are given a question asking you to dilute a solution and need to use the MV(initial)=MV(final) equation.
Molarity is a measure of concentration and is usually used when the solvent is water and/or the amount of solute is relatively small compared to the amount of solvent used. Later on, we'll probably learn molality, which is a better concentration when calculating things like temperature changes or when the solvent of the solution is not water.
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