Question

calculate the ph when 0.63 g of naf is added to 45 ml of 0.50 m hf. ignore any changes in volume. the ka value for hf is 3.5 x 10-4.

Answer 1

pH = 4.90

Step-by-step explanation:

Use the hassel henderbach equation:

`pH = pKa + log((Conjugate Acid or Base)/(Acid or Base))\\pH = -log(3.5*10^-4)+log(((0.63g Naf)/(45/1000L) )/(0.5 M HF)) = 4.90`