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3

Consider the molecular mass, and the mass of chlorine in 1 g of $\ce{PdCl2}$. Then consider the volume of the work space, and how quickly the $\ce{Cl2}$ disperses to fill that space. Until it disperses, the concentration at the source might be 1E6 ppm (i.e. 100%), but is that meaningful? If it disperses to fill a flask, what is that volume? Are you doing ...

1

Run everything one more cycle and you are totally safe. Copper is highly soluble in water, so it will entirely dissolve and go away, not contaminating your plates.

4

We might as well consult the experts, namely storage tank manufacturers. This site describes several types of storage tanks, none of them metal except for rubber-lined steel, in which (we hope) the rubber keeps the acid out of contact with the steel. Rubber lining of steel is often used in processes such as acid rinsing tanks where the steel is needed for ...

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