Question

When 100.0 mL of 0.40 M of HF and 100.0 mL of 0.40 M of NaOH are mixed, the resulting mixture is:________a. a strong acid b. a strong base c. a weak acid d. a weak base e. a buffer

Answer 1

d. A weak base

Step-by-step explanation:

For this question, we have to start with the reaction between
`HF` and
`NaOH`. So:

`HF~+~NaOH~->~NaF~+~H_2O`

Now, we have to analyze each compound:

Fluorhydric acid HF this is a strong acid because it has the ability to produce hydronium ions
`H^+`

Sodium hydroxide NaOH this is a strong base because it has the ability to produce hydroxide ions
`OH^-`

Sodium fluoride NaF is a salt in which the cation is
`Na^+` and the anion is
`F^-`

Water Is a neutral molecule usually the solvent

Now, we have the reaction of a strong acid with a strong base. If we remember the conjugated base theory, a strong acid will produce a weak base. So, NaF is a weak base. We also have water, but this is a neutral molecule. With this in mind, the answer is d.

I hope it helps!