The weight of a china dish with a saturated solution of sodium nitrate at 40°C is 80 g. After evaporating
the whole solution the dish's weight along with the crystals is 40 g and solubility of NaNO3 at 40°C is
20 g. What is the weight of empty china dish ?
30g
To find the weight of the empty china dish, we need to subtract the weight of the sodium nitrate crystals from the total weight of the dish and crystals.
Given:
Weight of china dish with saturated solution of sodium nitrate = 80 g
Weight of china dish with crystals after evaporating the solution = 40 g
Solubility of NaNO3 at 40°C = 20 g
Step 1: Calculate the weight of sodium nitrate dissolved in the solution.
Weight of sodium nitrate = Weight of china dish with saturated solution - Weight of china dish with crystals
Weight of sodium nitrate = 80 g - 40 g
Weight of sodium nitrate = 40 g
Step 2: Calculate the weight of empty china dish.
Weight of empty china dish = Weight of china dish with saturated solution - Weight of sodium nitrate
Weight of empty china dish = 80 g - 40 g
Weight of empty china dish = 40 g
Therefore, the weight of the empty china dish is 40 grams.
To find the weight of the empty china dish, we need to subtract the weight of the crystals and the saturated solution from the final weight.
1. Start with the weight of the dish and saturated solution: 80 g
2. Subtract the weight of the crystals: 40 g
- This leaves us with the weight of the saturated solution before evaporation.
3. Subtract the weight of the saturated solution from the initial weight:
80 g - 40 g = 40 g
Therefore, the weight of the empty china dish is 40 g.
80 g = dish+xtals+H2O
-40 g = dish+xtals
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40 g = dish+xtals
-20 g = xtals
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20 g = dish