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PART - 1 CH - 1 Some Basic Concepts of Chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryPART - 1 CH - 1 Some Basic Concepts of Chemistry2 Marks
Question
What is normality and formality? Explain.
Do they depend on temperature?
✓

Answer

Normality (N) : The number of gram equivalents of solute, which is dissolved in one liter of solution, is called normality of the solution.
$
N=\frac{\text { Moles of solute }}{\begin{array}{c}
\text { equivalent weight of solute } \times \\
\text { volume of solution (in liter) }
\end{array}}
$
Formality (F) : The number of gram formula weights of solute dissolved in one liter of solution is called formality of solution. Formality is used when a solute is combining or dissociating in a solution.
$
F=\frac{\text { Moles of solute }(\text { in } gm)}{\begin{array}{c}
\text { Formula mass of solute } \times \\
\text { volume of solution (in liter) }
\end{array}}
$

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