Question

How many liters of a 0.88 M solution can be made with 25.5 gram of lithium fluoride?

Answer 1

Hint: Molarity is represented by the symbol M defined as the total number of moles of solute per liter of solution. One molar is the molarity of a solution where one gram of solute is dissolved in 1 liter of the solution.

Complete step-by-step answer: Solution is mainly composed of solute and solvent where solute is that which is present in less amount i.e. to be dissolved and solvent in which it get dissolved i.e. present in higher amount and solute and solvent both make solution.
According to the definition of molarity we can express the equation for calculating molarity which is the ratio of the moles of solute whose molarity is to be calculated and the volume of the solvent dissolved in the given solute.
$M=\dfrac{n}{V}$
Here, M is the molarity of the solution, n is defined as the number of solute and V is the volume of the solution in liters.
In this question number of solute can be find by $\dfrac{molar\ \text{mass of LiF}}{given\ \text{mass}}=\dfrac{25.939}{25.5}=0.983$
Hence n = 0.983, M = 0.88 M then the value of V can be calculated as:
$V=\dfrac{n}{M}=\dfrac{0.983}{0.88}=1.117L$
Hence we can say that 1.117 liters of a 0.88 M solution can be made with 25.5 gram of lithium fluoride.

Note: Molarity is dependent on the changes in physical properties like temperature and pressure because with the change in temperature and pressure volume also changed which changes the volume of molarity.