Question

The laboratory technician made up some limewater for use in chemistry experiments. She dissolved 15 g of calcium hydroxide in water to make up 21 of solution. What is the concentration of the limewater?

Answer 1

The concentration of the limewater is 0.0096 M.

Step-by-step explanation:

To find the concentration of the limewater, we need to calculate the molarity. Molarity is defined as the number of moles of a solute per liter of solution. In this case, we have dissolved 15 g of calcium hydroxide in water to make 21 L of solution.

To calculate the molarity, we need to convert the mass of calcium hydroxide to moles using its molar mass (74.1 g/mol).

Moles of calcium hydroxide = mass / molar mass

Moles of calcium hydroxide = 15 g / 74.1 g/mol = 0.202 mol

Molarity = moles of solute / volume of solution

Molarity = 0.202 mol / 21 L = 0.0096 M