Ans: To prepare a 100ml solution of NaOH with a concentration of 0.1 moles per liter (M), you will need to follow these steps: • Find the molar mass of NaOH, which is 40g. • Use the formula for molarity (M): Molarity (M) = Volume of solution in liters (V) / Number of moles of solute (n). We want a 0.1M solution, and we have a volume of 100 ml, which is 0.01 liters (0.01L). • To calculate the number of moles (n), rearrange the formula: n = M x V = 0.1 x 0.01 = 0.01 moles. • Now, we need to figure out the mass of NaOH required to make the 100ml 0.1M solution. The mass is given by: Mass = n x Molar mass = 0.01 x 40 = 0.4g. • Take 0.4 grams of NaOH and put it in a beaker. • Gradually add a small amount of water to dissolve the NaOH. • Continue adding water until the total volume reaches 100ml.