Final answer:
The temperature at which 70 g of potassium dichromate will form a saturated solution in 100 g of water can be determined using a specific solubility curve for potassium dichromate, which is not provided here.
Step-by-step explanation:
To determine at what temperature 70 g of potassium dichromate (K₂Cr₂O₇) will form a saturated solution in 100 g of water, you would typically refer to a solubility curve specific for potassium dichromate. However, based on the information provided, we don't have the exact solubility curve for K₂Cr₂O₇. If we had that data, we could find the temperature at which the solubility of K₂Cr₂O₇ equals 70 g per 100 g of water. Without the solubility curve, the answer cannot be accurately determined. For reference, the process explained to determine solubility involves using the given solubility curve and comparing the amount of solute to the curve's indicated value at various temperatures – as illustrated with potassium nitrate (KNO₃). It is important to note that solubility curves vary among different substances, so the curve for KNO₃ cannot be used to determine the solubility of K₂Cr₂O₇.