Answer: -
Concentration of PbI₂ = 1.5 x 10⁻³ M
PbI₂ dissociates in water as
PbI₂ ⇄ Pb²⁺ + 2 I⁻
So PbI₂ releases two times the amount of I⁻ as it's own concentration when saturated.
Thus the molar concentration of iodide ion in a saturated PbI₂ solution = [ I⁻] =
= 1.5 x 10⁻³ x 2 M
= 3 x 10⁻³ M
PbI₂ releases the same amount of Pb²⁺ as it's own concentration when saturated.
[Pb²⁺] = 1.5 x 10⁻³ M
So solubility product for PbI₂
Ksp = [Pb²⁺] x [ I⁻]²
=1.5 x 10⁻³ x (3 x 10⁻³)²
= 4.5 x 10⁻⁹
If the item or substance has changed into a state where you are able to change it back such as:
Water melting
Water freezing
Answer is: <span> 1.4 × 10-10 m
</span>pH = 9.85.
[H₃O⁺] = 10∧(-9.85).
[H₃O⁺] = 1.4·10⁻¹⁰ M.
pH (potential of
hydrogen) is a numeric scale used to specify the acidity or basicity <span>an aqueous solution.
</span>If pH is greater than
seven, solution is base and if pH is equal seven, solution is neutral and if pH of solution is less than seven, than is acidic.<span>
</span>
The root-mean-square speed measures the average speed of the gas molecules. The relation of root-mean-square speed and the absolute temperature is based on the kinetic molecular theory of gases.
The root-mean-square speed define as ν_rms
where:
ν_rms = √(3RT/M)
R = universal gas constant; 0.8206 L-atm/mol-K
T = absolute temperature
M = molecular weight of gas particles
So, if the temperature of the gas is quadrupled the root-mean-square speed will be doubled.
Proof:
Since T is quadrupled, then T=4T
Substitute to the formula of root-mean-square speed,
ν_rms = √[3R(4T)/M]
= 2√(3RT/M) since the square root of 4 is 2
Therefore, root-mean-square speed is doubled when the absolute temperature is quadrupled.