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.

answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

hope it

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.