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Observation of a precipitate

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Will a precipitate be observed if .10 mol Ag+ and .001 mol SO4^2- are added to make 1.0L of solution? (KSP= 1.4*10^-5)

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Will a precipitate be observed if 0.10 mol Ag+ and ...

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The solution provides a brief explanation for whether or not a precipitate will be observed.

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Redox Reactions

This is a lab which deals with oxidation-reduction. We did a set of experiments in the lab. This is our procedure and observations:

a) Dissolve a small amount of magnesium (II) chloride in half a beaker of water. (There is no redox process yet). Now add a few mL of NaOH. First make observations before the solution is stirred, then stir only briefly. Watch for change particularly on the liquid surface. (hint: the first fluffy precipitate observed is not a result of redox, rather it is a result of precipitation (solubility of hydroxides))
observation: It turns yellow, and a solid type is formed and settles on the bottom. Once stirred, it got a bit darker. Solid is formed and is more noticeable. Black precipitate forms in the top of the solution.

b) Add a small amount of MnO2 to 6M HCl.
Observation: When 6M HCl was added to MnO2, it just turned into a dark solution and it looks like MnO2 is not dissolved.

Please help come up with a balanced oxidation reduction equation for both a and b.

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