Answer to Question #235172 in General Chemistry for Nana

Question

What volume (mL) of 0.025 M HNO₃ is necessary to titrate 19.6 mL of 0.042 M Ca(OH)₂ solution to the endpoint?

Answer 1

The balanced reaction equation:

Ca(OH)₂ + 2 HNO₃ = Ca(NO₃)₂ + 2 H₂O

The quantity of Ca(OH)₂:

(0.042 M) * (0.01960 L) = 0.0008232 mol

So, the quantity of HNO₃ is:

(0.0008232 mol) * 2 = 0.0016464 mol

Therefore, the volume must be:

(0.0016464 mol) / (0.025 M) = 0.065856 L = 65.856 mL

Answer: 65.856 mL