Question

6. Which two compounds could be reacted to form solid calcium fluoride? a. Hydrofluoric acid (weak)...

6. Which two compounds could be reacted to form solid calcium fluoride?

a. Hydrofluoric acid (weak) and calcium nitrate

b. Lithium fluoride and calcium phosphate

c. Calcium sulfate and potassium fluoride

d. Magnesium fluoride and calcium nitrate

e. Calcium nitrate and lithium fluoride

The answer key says E, where F has to double in order to balance out with the Calcium which is the same case with answer choice C. Can you give an explanation for why the answer is E and not the other choices?

Science   Chemistry   
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Answer #1

E. Both calcium nitrate and lithium fluoride are soluble . On combining both of them gives precipitation of calcium fluoride readily.

But in remaining options one of given us sparingly soluble.

In

A. HF is weak acid, provides few fluoride ions only.

B. Calcium phosphate is sparingly soluble, so provides few calcium ions.

C. Calcium sulphate is sparingly soluble so provides few calcium ions only.

D. Magnesium fluoride is sparingly soluble so provides few fluoride ions only.

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