Answer:
1.41x10⁻⁴ M
It will not attain the level recommended.
Explanation:
When the NaF is added to the water, it will dissociate, forming the ions Na⁺ and F⁻. The fluoride ion may react with the Ca⁺² ions to form the salt CaF₂, which can dissociate too. The dissociation, or solubilization, is characterized by the solubility product (Kps), which is an equilibrium constant. For CaF₂, Kps = 4.0x10⁻¹¹, so:
CaF₂(s) ⇄ Ca⁺² + 2F⁻(aq)
The solids are not put in the equilibrium expression, so:
Kps = [Ca⁺²] * [F⁻]²
4.0x10⁻¹¹ = 0.0020*[F⁻]²
[F⁻]² = 2.0x10⁻⁸
[F⁻] = √2.0x10⁻⁸
[F⁻] = 1.41x10⁻⁴ M
Which is the maximum concentration to the solution be saturated, after that, the solid will precipitated. Because the concentration of fluoride ion is lower than the recommended, it will not attain.
Answer:<span>0.40 atm
How did we get 0.40?
Use the formula of Dalton's Law of partial pressure. </span>
Work it out by substituting the given values.
Given:
Total gas exerted by nitrogen- 80%
Total pressure- 2.0 atm
pressure of oxygen-?
P denotes total pressure exerted by nitrogen and n denotes total pressure of the mixture.
Poxygen = P/n
= 0.8 /2.0
= 0.4
(80 % is changed into decimal number, 0.8)
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