A 1.00 liter solution contains 0.50 M hydrofluoric acid and 0.38 M sodium fluori

ID: 1036465 • Letter: A

Question

A 1.00 liter solution contains 0.50 M hydrofluoric acid and 0.38 M sodium fluoride.

If 25.0 mL of water are added to this system, indicate whether the following statements are true or false.

(Note the the volume MUST CHANGE upon the addition of water.)

_______TrueFalseA. The concentration of HF will remain the same.

_______TrueFalseB. The concentration of F- will decrease.

_______TrueFalseC. The equilibrium concentration of H3O+ will decrease.

_______TrueFalseD. The pH will decrease.

_______TrueFalseE. The ratio of [HF] / [F-] will increase.

A. False. Because as water is added then HF will dissociate and forms hydronium ion (H3O+) ion and F- ion. So concentration of HF decreases.

B. False.

C. True. As hydronium ion is formed by HF and water.

D. True. Hydrogen ions concentration decreases as hydronium ion is formed from HF.

E. False. as HF concentration decreased and Fluoride ion concentration increased then their ratio is decreased but not increased

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