Question

A chemist prepares a solution of calcium sulfate (CaSO₄) by measuring out 0.106 umol of calcium sulfate into a 100. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mmol/L of the chemist's calcium sulfate solution.

Answer 1

To calculate the concentration of the calcium sulfate solution, convert the given amount of calcium sulfate into moles and divide it by the volume of the solution. The concentration of the chemist's calcium sulfate solution is 0.00106 mmol/L.

Step-by-step explanation:

To calculate the concentration of the calcium sulfate solution, we need to convert the given amount of calcium sulfate into moles and then divide it by the volume of the solution.

Given:

• Amount of calcium sulfate = 0.106 μmol
• Volume of the solution = 100 mL = 0.1 L

To convert μmol to mmol, we divide the given amount by 1000:

0.106 μmol ÷ 1000 = 0.000106 mmol

Now we can calculate the concentration:

Concentration = Amount of substance / Volume of solution

Concentration = 0.000106 mmol / 0.1 L

Concentration = 0.00106 mmol/L

Therefore, the concentration of the chemist's calcium sulfate solution is 0.00106 mmol/L.