To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at
293 K. Find its concentration at this temperature.
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To make a saturated solution, 36g of sodium chloride is dissolved in 100g of water at 293K. Find its concentration at this temperature.
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Hint: There are three different ways in which we can describe concentration; however, mass of solute and mass of solvent is given in the question, therefore, concentration will be the mass of solute divided by the mass of solution.
Complete step by step solution:
As we can see in the question, mass of solute and mass of solvent is given in the question. So, we will have to calculate the mass percentage of the solution.
Also, we should know about what the saturated solution is. It is a solution at which the maximum amount of solute that can be dissolved under the particular temperature and pressure at which the solution exists.
Mass Percentage:
When mass of both the solute and the solvent is given in grams, it is always convenient to express the concentration in terms of Mass percentage.
Mass of solute (sodium chloride) =36g
Mass of solvent (water)= 100g
Percent by Mass=Mass of Solute/Mass of Solventx 100
Therefore, Concentration of solution=36/126x100=36/126x100=26.47% (w/w)
As per the given calculation, the concentration of this saturated solution at this temperature= 26.47%.
Also, if temperature increases, solubility also increases and if it decreases solubility also decreases. It infers that solubility is directly proportional to the temperature.
Note: Never forget to mention the unit of mass percentage i.e. w/w or v/v or w/v. The sodium chloride solution in water is homogeneous in nature. Also, the above reaction is endothermic in nature which means it absorbs energy from the surroundings
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