The effect of intermolecular forces IF is indeniable when it comes to predict th

Question

The effect of intermolecular forces IF is indeniable when it comes to predict the other physical properties of a PURE SOLVENT. Thus, considering a pure substance A, one can conclude that the stronger is the intermolecular forces, the _________ (higher/stronger/weaker/no change) is the boiling point BP, the _________ (higher/stronger/weaker/no change) is the surface tension ST, and the _________ (higher/stronger/weaker/no change) is the vapor pressure VP.

Sodium thiosulfate, Na2S2O3 has a solubility of 231 g/100mL H2O at 100oC. At 25oC the solubility is 50g/100mL H2O. 100g of sodium thiosulfate was dissolved in 50mL water, at 100oC. The solution was_________(unsaturated/supersaturated/saturated). The solution has been cooled down to 25oC without disturbance. The solution was then _________(unsaturated/supersaturated/saturated). 3g of Na2S2O3 was added to the solution and some crystal precipitated out of solution. At that point of time, the solution is  _________(unsaturated/supersaturated/saturated). After filtration, the mass of crystal collected should approximately be _________(78g / 75g / 131g / 50g). Hint: Don't forget the 3g used to precipitate the extra sodium thiosulfate. PLEASE SHOW WORK.

Explanation / Answer

1. higher

2. higher

3. weaker

unsaturated

saturated

supersaturated

75 grams

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