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Solutions — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistrySolutions2 Marks
Question
Define the following terms :
  1. Ideal solution.
  2. Molarity $(M).$
✓

Answer

  1. solution:
The solution which obey Roult's law over entire range of concentration are known as ideal solution.
For ideal solution: Enthalpy of mixing of the pure components to form the solution, $\triangle _{mix}\ H = 0$ and volume of mixing, $\triangle _{mix}\ V = 0$
  1. Molarity:
It is defined as the number of moles of solute present in $1000$ mL of the solution. Molarity is represented by $M.$
$\text{Molarity (M)}=\frac{\text{Number of moles of solute}}{\text{ volume of solution in mL}}\times1000$
or
$\text{M} = \frac{\text{Weight of solute}}{\text{molar mass of solute}\times \text{Volume of solution in mL}}\times1000$

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