Question

calculate the concentration of hydroxide ion in a solution prepared by dissolving 0.844 g of solid naoh in enough water to make 550 ml of solution.

Answer 1

To calculate the concentration of hydroxide ions in the solution, divide the moles of NaOH by the volume of the solution. In this case, the concentration of hydroxide ion is 0.0382 M.

Step-by-step explanation:

To calculate the concentration of hydroxide ions in the solution, we need to use the concept of molarity. Molarity is defined as the number of moles of solute per liter of solution.

First, we need to calculate the number of moles of NaOH in the solution. We can use the formula:

Moles of NaOH = Mass of NaOH / Molar mass of NaOH

The molar mass of NaOH is 22.99 g/mol + 16.00 g/mol + 1.01 g/mol = 40.00 g/mol

Now, calculate the moles of NaOH:

Moles of NaOH = 0.844 g / 40.00 g/mol = 0.0211 mol NaOH

Next, convert the volume of the solution to liters:

Volume of solution = 550 ml = 0.550 L

Finally, calculate the concentration of hydroxide ion:

Concentration of OH- = Moles of NaOH / Volume of solution

Concentration of OH- = 0.0211 mol / 0.550 L = 0.0382 M