Question

Calculate the molarity of an iron (ll) cyanide solution where 3.7 grams of Iron (II) Cyanide are dissolved in a total volume of 2 L of water.

Answer 1

• We can find molarity by relating the number of moles of iron (ii) cyanide in 2L to 1L volume. Since molarity is simply number of moles in 1000ml or 1L.
• Number of moles = mass/molar mass
• 3.7/107.88=0.0343moles
• If 0.0343moles are in 2L, what about 1L.
• 1x0.0343/2=0.0171M
• Ans=0.0171M