Determine the pHpH of an HFHF solution of each of the following concentrations. In which cases can you not make the simplifying assumption that xx is small? (KaKa for HFHF is 6.8×10−46.8×10−4.)

The question is incomplete, complete question is :

Determine the pH of an HF solution of each of the following concentrations. In which cases can you not make the simplifying assumption that x is small? ( for HF is .)

[HF] = 0.280 M

Express your answer to two decimal places.

The pH of an 0.280 M HF solution is 1.87.

Explanation:3

Initial concentration if HF = c = 0.280 M

Dissociation constant of the HF =

Initially

c          0            0

At equilibrium :

(c-x)      x             x

The expression of disassociation constant is given as:

Solving for x, we get:

x = 0.01346 M

So, the concentration of hydrogen ion at equilibrium is :

The pH of the solution is ;

The pH of an 0.280 M HF solution is 1.87.

c) should be the answer.