NCERT · Class 10 · Science · Acids, Bases and SaltsCalculate the molarity of a solution containing 10 g of NaOH in 250 mL of water. Also, explain the importance of molarity in everyday life.

Step 1: Calculate the molarity of NaOH

To calculate the molarity of NaOH, we need to know the number of moles of NaOH present in the solution. The molar mass of NaOH is 40 g/mol. We can calculate the number of moles of NaOH as follows:

moles NaOH = mass NaOH / molar mass NaOH moles NaOH = 10 g / 40 g/mol moles NaOH = 0.25 mol

Step 2: Calculate the volume of the solution in liters

The volume of the solution is given as 250 mL. We need to convert this to liters. 1 L = 1000 mL, so:

volume solution (L) = 250 mL / 1000 mL/L volume solution (L) = 0.25 L

Step 3: Calculate the molarity of NaOH

The molarity of NaOH can be calculated as follows: molarity NaOH = moles NaOH / volume solution (L) molarity NaOH = 0.25 mol / 0.25 L molarity NaOH = 1 M

Importance of Molarity in Everyday Life

Molarity is an important concept in chemistry that has numerous applications in everyday life. Molarity is a measure of the concentration of a solution, and it is used to determine the amount of a substance present in a solution. In medicine, molarity is used to determine the concentration of medications, and in industry, molarity is used to determine the concentration of chemicals. In agriculture, molarity is used to determine the concentration of fertilizers, and in environmental science, molarity is used to determine the concentration of pollutants. In summary, molarity is an essential concept in chemistry that has numerous applications in various fields.