Advertisements
Advertisements
प्रश्न
Which solution has the lower freezing point? 10 g of methanol (CH3OH) in 100g g of water (or) 20 g of ethanol (C2H5OH) in 200 g of water.
Advertisements
उत्तर
∆Tf = Kf i.e
∆Tf α m
`"m"_("CH"_3-"OH") = (10/32)/0.1`
= 3.125 m
`"m"_("CH"_3-"OH") = (20/46)/0.2`
= 2.174 m
∴ Depression in freezing point is more in methanol solution and it will have lower freezing point.
APPEARS IN
संबंधित प्रश्न
What role does the molecular interaction play in a solution of alcohol and water?
Heptane and octane form an ideal solution. At 373 K, the vapour pressures of the two liquid components are 105.2 kPa and 46.8 kPa respectively. What will be the vapour pressure of a mixture of 26.0 g of heptane and 35 g of octane?
Vapour pressure of pure acetone and chloroform at 328 K are 741.8 mm Hg and 632.8 mm Hg respectively. Assuming that they form ideal solution over the entire range of composition, plot `p_"total"`, `p_"chloroform"` and `p_"acetone"` as a function of `chi_"acetone"`. The experimental data observed for different compositions of mixtures is:
| `bb(100 xx chi_"acetone")` | `bb(P_"acetone"//"mm Hg")` | `bb(p_"chloroform"//"mm Hg")` |
| 0 | 0 | 632.8 |
| 11.8 | 54.9 | 548.1 |
| 23.4 | 110.1 | 469.4 |
| 36 | 202.4 | 359.7 |
| 50.8 | 322.7 | 257.7 |
| 58.2 | 405.9 | 193.6 |
| 64.5 | 454.1 | 161.2 |
| 72.1 | 521.1 | 120.7 |
Plot this data also on the same graph paper. Indicate whether it has a positive or negative deviation from the ideal solution.
Which one of the following is incorrect for an ideal solution?
The mass of a non – volatile solute (molar mass 80 g mol-1) should be dissolved in 92g of toluene to reduce its vapour pressure to 90% ______.
For ideal solution the enthalpy of mixing of the pure components to form the solution is ____________.
What is “semi permeable membrane”?
How many times more hydrogen ions in a solution with a pH of 3 than in a solution with a pH of 6
Suggest the most important type of intermolecular attractive interaction in the following pair.
NaClO4 and water
Suggest the most important type of intermolecular attractive interaction in the following pair.
Methanol and acetone
