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

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14-07-2020
Chemistry

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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

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jescaherga jescaherga · Answer 1 · 2020-07-15T02:35:29+02:00

Answer:

d. A weak base

Explanation:

For this question, we have to start with the reaction between [tex]HF[/tex] and [tex]NaOH[/tex]. So:

[tex]HF~+~NaOH~->~NaF~+~H_2O[/tex]

Now, we have to analyze each compound:

Fluorhydric acid HF this is a strong acid because it has the ability to produce hydronium ions [tex]H^+[/tex]

Sodium hydroxide NaOH this is a strong base because it has the ability to produce hydroxide ions [tex]OH^-[/tex]

Sodium fluoride NaF is a salt in which the cation is [tex]Na^+[/tex] and the anion is [tex]F^-[/tex]

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!