Question

A solution of potassium fluoride turns litmus paper blue. What are the products of the modified Arrhenius net ionic equation for this compound?(Choose all the correct answers)

Question 2 options:

A. OH-

B. H3O+

C. F-

D. H2O

E. HF

F. HKF+

Answer 1

KF in water ionizes 100% to give K^+ and F^-. The F^- reacts with H2O (it hydrolyzes) as follows:

F^- + HOH ==> HF + OH^-
So it's the OH^- that causes the litmus paper to turn because the solution is basic.