Answer: Understanding oxidation-reduction reactions
Explanation:
Rusting occurs when electrons are exchanged between iron and oxygen.
He thought elements that haven't been discovered belonged in the place of the gap. He could also use the atomic mass of the missing elements
Earthquakes happen at Transform boundaries
Answer : The molar solubility of
in pure water is, 0.0118 M
Explanation : Given,
![K_{sp}=6.60\times 10^{-6}](https://tex.z-dn.net/?f=K_%7Bsp%7D%3D6.60%5Ctimes%2010%5E%7B-6%7D)
The solubility equilibrium reaction will be:
![PbBr_2\rightleftharpoons Pb^{2+}+2Br^{-}](https://tex.z-dn.net/?f=PbBr_2%5Crightleftharpoons%20Pb%5E%7B2%2B%7D%2B2Br%5E%7B-%7D)
Let the molar solubility be 's'.
The expression for solubility constant for this reaction will be,
![K_{sp}=[Pb^{2+}][Br^{-}]^2](https://tex.z-dn.net/?f=K_%7Bsp%7D%3D%5BPb%5E%7B2%2B%7D%5D%5BBr%5E%7B-%7D%5D%5E2)
![K_{sp}=(s)\times (2s)^2](https://tex.z-dn.net/?f=K_%7Bsp%7D%3D%28s%29%5Ctimes%20%282s%29%5E2)
Now put all the given values in the above expression, we get:
![6.60\times 10^{-6}=4s^3](https://tex.z-dn.net/?f=6.60%5Ctimes%2010%5E%7B-6%7D%3D4s%5E3)
![s=0.0118M](https://tex.z-dn.net/?f=s%3D0.0118M)
Therefore, the molar solubility of
in pure water is, 0.0118 M
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