The solubility of KCL at 25°C is 30 g. What weight of KCL will be left when 20 of its saturated solution at 25°C is evaporated to dryness.
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Answer:
The solubility of KCl = 30 gram
The mass of evaporated solution = 20 gm
To Find:
The weight of KCl left behind after evaporation.
Calculation:
- The solubility of KCl is 30 grams.
⇒ The mass of KCl in 100 gm of the saturated solution = 30 gm
⇒ The mass of KCl in 20 gm of the saturated solution = (30/100) × 20 gm
⇒ The mass of KCl in 20 gm of the saturated solution = 6 gm
- SInce KCl cannot evaporate, after complete dryness is reached, this mass remains left over.
- So, the weight of KCl left behind after evaporation is 6 gm.
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