Question

Calculate the pH of 0.1M ammonia solution. Calculate the pH after 50 ml of this solution is treated with 25 ml of 0.1M HCl. The dissociation constant of ammonia, K_b = 1.77 × 10^-5.

Answer 1

For NH₄OH

When NH₃ is added, neutralization occurs

(M_NH4Cl) number of mole of NH₄Cl = 0.0025

(M_NH4OH) Remaining mole of NH₄OH = 0.005 – 0.0025 = 0.0025

According to Henderson’s equation,