The solubility of salt in water is a function of the water temperature. Let S represent the solubility of NaCl (sodium chloride) as grams of salt in 100 g of water. Let T be temperature in °C. Use the following data to obtain a curve t for S as a function of T. Use the t to estimate S when T = 25°C.

T (°C) S (g NaCl/100 g H₂O)

10 ……………….. 35

20 ……………….. 35.6

30 ……………….. 36.25

40 ……………….. 36.9

50 ……………….. 37.5

60 ……………….. 38.1

70 ……………….. 38.8

80 ……………….. 39.4

90 ……………….. 40