Hint 10
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The concentration of lead ions (Pb2+) in a sample of polluted water that also contains nitrate ions
(NO3) is determined by adding solid sodium sulfate (Na2SO4) to exactly 500 mL of the water. Calculate
the molar concentration of Pb2+ if 0.00415 g of Na2SO4 was needed for the complete precipitation of
lead ions as PbSO4
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Construct the hypothetical phase diagram for metals a and b between room temperature (20c) and 700c, given the following information: * the melting temperature of metal a is 480c. • the maximum solubility of b in a is 4 wt% b, which occurs at 420c. • the solubility of b in a at room temperature is 0 wt% b. • one eutectic occurs at 420c and 18 wt% b–82 wt% a. • a second eutectic occurs at 475c and 42 wt% b–58 wt% a. • the intermetallic compound ab exists at a composition of 30 wt% b–70 wt% a, and melts congruently at 525c.• the melting temperature of metal b is 600c. • the maximum solubility of a in b is 13 wt% a, which occurs at 475c. • the solubility of a in b at room temperature is 3 wt% a.

Ab c or d ? i’m not sure what the answer is

What is the oxidation state of each individual carbon atom in c2o42−?