Consider a solution which is 0.15 M in HF and 0.10 M in KF. Which response contains all the true statements, and no others?

I. If NaOH is added, potassium ion reacts with hydroxide ion.
II. If a small amount of NaOH is added, the pH increases very slightly.
III. If HNO3 is added, hydrogen ion reacts with fluoride ion.
IV. If more KF is added, the pH decreases.

A. I, III, and IV
B. II and III
C. II and IV
D. III
E. another combination.

Based on the above option B is the only response that contains all the true statements because when a small amount of NaOH is added to the solution, the pH increases very slightly and if more nitric acid (HNO3) is added, since nitric acid is a strong acid that is stronger than HF, the nitric acid (HNO3) will protonate.

tallinn tallinn · Answer 2 · 2022-03-26T19:18:40+01:00

If a miniature amount of NaOH is added, the pH increases slightly.

If HNO3 is counted, hydrogen ion reacts with fluoride ion.

The correct option is B. II and III

What is Nitric acid?

I. If NaOH is added, potassium ion reacts with hydroxide ion is False

II. If a small amount of NaOH is added, the pH increases very slightly is True

III. If HNO3 is added, hydrogen ion reacts with fluoride ion is True

IV. If more KF is added, the pH decreases is False

That is based on the overhead option B is the only response that contains all the true statements just because when a small amount of NaOH is counted to the solution, Then the pH increases very slightly, and also if more nitric acid (HNO3) is added since nitric acid is a strong acid that is stronger than HF, the nitric acid (HNO3) will protonate.

Therefore, The correct option is 'B'

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