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प्रश्न
Concentration terms such as mass percentage, ppm, mole fraction and molality are independent of temperature, however molarity is a function of temperature. Explain.
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उत्तर
Molarity of a solution is a weight by volume relationship to represent its strength and defined as the number of moles of solute dissolved in one litre of solution. Since volume depends on temperature and undergoes a changes with change in temperature, the molarity will also change with change in temperature. On the other hand, the other concentration terms such as mass percentage, ppm, mole fraction and molality are based uopn mass by mass relationship of solute and solvent present in a binary solution. Mass does not change with change in tempetature, as a result these concentration terms remain unchanged with variation of temperature. According to the defination of all these terms, mass of the solvent used for making the solution is related to the mass of solute.
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संबंधित प्रश्न
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 |
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