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Topic Content:
- Meaning of Water of CrystallizationWater of crystallization is the fixed number of water molecules that are chemically combined with a salt in its crystalline form. These water molecules are part of the crystal structure, not... More
What is Water of Crystallization?
Water of crystallization is an impurity in a compound. It does not take part in the chemical reaction. Hence, concentrations calculated from results during titrationTitration is a quantitative method of chemical analysis used to determine the unknown concentration of a solution (called the analyte) by gradually adding a solution of known concentration (called the titrant)... More is that of the anhydrous substance. Water of crystallization and the percentage of water of crystallization can be calculated during titration.
The molecules of water of crystallization contained in a hydrated salt are given by the following relations.
\( \frac{Mass\: concentration \: of \: anyhdrous\:salt}{Molar\: mass \:of \: anyhdrous\:salt} \\=\frac{Mass\: concentration \:of \: hydrated\:salt}{Molar\: mass \:of \:hydrated\:salt}\\= \frac{Mass\:concentration \:of \: water \: molecules}{Molar\: mass \:of \:water \: molecules} \)
\( \frac{Mass\:concentration\:of \: anyhdrous\:salt}{Mass\: concentration \:of \: hydrated \:salt}\\ = \frac{Molar\: mass \:of \: anyhdrous\:salt}{Molar\: mass \:of \: hydrated\:salt} \)
Mass concentration of water molecules =
Mass concentration of hydrated salt – Mass concentration of anhydrous salt
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Percentage (%) of water of crystallization =
\( \frac{Mass\; concentration \: of \: water \: of \: crystallization}{Mass\: concentration \:of \: hydrated \: salt} \: \times \: \frac{100}{1} \)
Example 1.3.1:
A is a solution containing 0.1 mol dm-3 HNO3 .
B is a solution of anhydrous Na2 CO3 salt.
The equation for the reaction is thus:
2HNO3(aq) + Na2 CO3(aq) → 2NaNO3(aq) + H2 O(aq) + CO2(g)
Put A into the burette and titrate it against 20.0 cm3 or 25.0 cm3 portion of B using the methyl orange indicator. Note the first burette reading. This is your rough titre. Repeat the titration three more times and record your results.
(a). Calculate
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