What is the pH of the buffer that results when 2.49 g of NH₃ and 6.46 g of NH₄Cl are dissolved in 250 mL water? (K_a for NH₄⁺ = 5.60 × 10^-10)

Please give the answer to 2 decimal places.

Wat is die pH van die buffer wat ontstaan wanneer 2.49 g NH₃ en 6.46 g NH₄Cl opgelos word in 250 mL water? (K_a vir NH₄⁺ = 5.60 × 10^-10)

Gee asseblief die antwoord tot 2 desimale plekke.