Potassium Dichromate Solubility Curve
Suppose a solution at 50℃ contains 12 g of potassium dichromate (K₂Cr₂O₇) per 100 g of water.
Based on the provided solubility curve, what additional mass of potassium dichromate is required to saturate the solution at this temperature?

A30 g
B12 g
C8 g
D18 g
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