Answer:
a. 30 mL
b. 6.9 g
Explanation:
Let's consider the following precipitation reaction.
Pb²⁺(aq) + 2I⁻(aq) ⇄ PbI₂(s)
<em>a. What volume of a 1.0 M KI solution must be added to 100.0 mL of a solution that is 0.15M in Pb²⁺ ion to precipitate all the lead ion?</em>
First, we will calculate the moles of Pb²⁺.
The molar ratio of Pb²⁺ to I⁻ is 1:2. Then, we have 2 × 0.015 mol = 0.030 mol of I⁻. There is 1 mole of I⁻ per mole of KI, so we also have 0.030 mol of KI. The volume of the 1.0 M KI solution is:
<em>b. What mass of PbI₂ should precipitate?</em>
The molar ratio of Pb²⁺ to PbI₂ is 1:1. Then, we have 0.015 mol of PbI₂. The molar mass of PbI₂ is 461.01 g/mol, and the mass corresponding to 0.015 moles is:
Answer:
It's true I got it wrong.
Explanation:
The forces between particles are called intermolecular forces. A strong intermolecular force means that the particles are tightly paced and is associated with the solid phase. Moderate intermolecular force is associated with the liquid state and little to no intermolecular force is associated with the gaseous state. Temperature has a direct effect on the state of matter in which the substance exists has. Generally speaking, a rise in tempreature changes a substance from the solid to liquid phase and from liquid to gaseus phase. The reverse is true, if the temperature lowers then the substance will go from gas to liquid and liquid to solid. It is important to not that temperature affects intermolecular forces. As the temperature increases then the individual particles become excited and gain enough energy to over the intermolecular forces and so the particles seperate from each other.
<span>The rate of crystallizing is equivalent to the rate of dissolving.</span>
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