Question

A 25.0 mL sample of an aqueous solution of calcium hydroxide, Ca(OH)2, is titrated to the equivalence point with 21.2 mL of 0.620 M sulfuric acid, H2SO4, acid solution. What is the molarity of the calcium hydroxide solution?

Answer 1

• C1/C2=V2/V1
• C1/21.2=0.62/25
• C1/21.2=0.0248
• C1=0.0248(21.2)
• C1=0.53M

Answer 2

Let's see

• C1V1=C2V2
• 25C1=21.2(0.620)
• 25C1=13.144
• C1=0.526M