Under constant temperature, the volume occupied by a gas varies inversely to the pressure applied. If the gas occupies a volume
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Answer:
The answer is "237.247".
Explanation:
SI Unit:
This is an acronym of the word Système International in French. Its International System of Units (SI) is a metric system that would be universally acknowledged as a measurement standard. SI units play an important function in research and innovation in science and technology. In this, the temperature will be measure in the kelvin.
Conversion :
let,
So,
Answer:
I. Solution will form a precipitate.
II. Solution will not form a precipitate.
Explanation:
I. 0,00090g of Na₂CrO₄ are:
0,00090g×= 5,56x10⁻⁶ moles of Na₂CrO₄≡ moles of CrO₄²⁻.
As volume of solution is 225mL:
5,56x10⁻⁶ moles of CrO₄²⁻ / 0,225L = <em>2,47x10⁻⁵ M of CrO₄²⁻</em>.
The molar concentration of Ag⁺ is 0,00025M.
Ag⁺ with CrO₄²⁻ ions produce:
Ag₂CrO₄(s) ⇄ 2Ag⁺(aq) + CrO₄²⁻(aq)
Where kps is:
kps = 1,1x10⁻¹² = [Ag⁺]² [CrO₄²⁻]
Replacing:
1,1x10⁻¹² = [0,00025M]² [2,47x10⁻⁵M]
1,1x10⁻¹² = 1,5x10⁻¹²
As the product of [Ag⁺]² [CrO₄²⁻] is higher than kps, the ions will decrease it concentration producing the precipitate.
II. Total volume of the solution is 0,300L, that means concentration of MgCl₂ and NaF will be:
0,0015M MgCl₂×= 0,0005M MgCl₂≡ Mg²⁺
0,012M NaF×= 0,008M NaF ≡ F⁻
F⁻ and Mg²⁺ ions produce:
MgF₂(s) ⇄ 2F⁻(aq) + Mg²⁺(aq)
Where kps is defined as:
kps = 3,7x10⁻⁸ = [F⁻]² [Mg²⁺]
Replacing:
3,7x10⁻⁸ = [0,008M]² [0,0005M]
3,7x10⁻⁸ = 3,2x10⁻⁸
As kps is higher than [F⁻]² [Mg²⁺], the ions will not form the precipitate.
I hope it helps!