4. When constructing a calibration graph for tartaric acid, the following data were obtained on a wedge polarimeter:
Concentration of tartaric acid solutions, % 10 20 30 40
Polarimeter readings, mm 9.9 19.1 27.3 34.9
How many g of tartaric acid must be dissolved in 250 ml of water so that the reading on the polarimeter scale is 23.5 mm.

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