Which of the following is true?
A. HF does not ionize in water to any extent.
B. All are true
C. HF ionizes equally in a solution of KCl as in pure water.
D. HF ionizes more in a solution of NaF than in pure water.
Tough question. Depends upon if you are a beginning student or an advanced student.
A is true since the Ka is about 10^-4 or so.
B is not true for later reasons.
C is true for beginning students. But ionic strength plays a part so not true for advanced students.
D. Not true. In a solution of NaF the ionization of HF is decreased.
To determine which of the statements is true, we need to understand the concept of ionization and the behavior of HF (hydrofluoric acid) in different solvents.
Ionization refers to the process in which a compound breaks apart into ions when dissolved in a solvent. In the case of HF, it can ionize by breaking up into the H+ (hydrogen ions) and F- (fluoride ions) in water.
A. HF does not ionize in water to any extent.
This statement is not true. HF is a weak acid and does ionize to a certain extent in water, producing some H+ and F- ions.
B. All are true.
We cannot conclude that all the statements are true without examining each one individually.
C. HF ionizes equally in a solution of KCl as in pure water.
This statement is not necessarily true. The presence of KCl in the solution can potentially affect the ionization of HF. It is important to consider the nature of KCl and its possible interactions with HF. For example, if KCl is a strong acid, it could compete for the available water molecules for ionization. Therefore, we cannot assume equal ionization of HF in a KCl solution compared to pure water.
D. HF ionizes more in a solution of NaF than in pure water.
This statement is true. NaF is a salt and, when dissolved in water, it dissociates into Na+ and F- ions. The presence of F- ions from NaF can increase the ionization of HF compared to pure water. The F- ions can stabilize the H+ ions produced during HF ionization through electrostatic attraction, facilitating further ionization.
Therefore, the correct answer is D. HF ionizes more in a solution of NaF than in pure water.