$($a$)$ Will lead corrode in deaerated water $(pH=7)?$ Identify the possible cathode reaction and anode reaction and use the $Pb-H_{2}O$ Pourbaix diagram to explain.

$($b$)$ Will lead corrode in aerated water $(pH=7)?$ Identify the possible cathode reaction and anode reaction and use the $Pb-H_{2}O$ Pourbaix diagram to explain.

Pourbaix diagram for the $Pb-H_{2}O$ system at $25C.$

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