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प्रश्न
What is the difference between molality and molarity?
Differentiate between molarity and molality.
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उत्तर
| Sr. No. | Molarity | Molality |
| 1. | Molarity is the concentration of a material determined as the number of moles of solute dissolved in one litre of solution. | Molality is the concentration calculated as the number of moles of solute found in one kilogram of solvent. |
| 2. | Molarity is denoted by the symbol M. | Molality is denoted by the symbol m. |
| 3. | The molarity formula is moles per litre. | The molality formula is moles per kilogram. |
| 4. | Molarity is impacted by temperature changes. | Molality is not affected by temperature changes. |
| 5. | Changes in pressure affect molarity. | Pressure changes do not affect molality. |
| 6. | Molarity can lead to an imprecise and inaccurate concentration. | Molality can lead to an accurate and precise concentration measurement. |
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| Physical quantity | Unit |
| (i) Molarity | (a) g mL–1 |
| (ii) Mole fraction | (b) mol |
| (iii) Mole | (c) Pascal |
| (iv) Molality | (d) Unitless |
| (v) Pressure | (e) mol L–1 |
| (vi) Luminous intensity | (f) Candela |
| (vii) Density | (g) mol kg–1 |
| (viii) Mass | (h) Nm–1 |
| (i) kg |
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