A chemistry student adds a quantity of an unknown solid compound X to 4.00 L of
ID: 574461 • Letter: A
Question
A chemistry student adds a quantity of an unknown solid compound X to 4.00 L of distilled water at 24° C. After 10 minutes of stirring, only a little X has dissolved. The student then drains off the solution and evaporates the water under vacuum. A precipitate is left behind. The student washes, dries and weighs yes above, can you calculate the Using only the solubility of X in water at 24. C If you said yes, calculate it Be sure your answer has a unit symbol and the right number of significant digits.Explanation / Answer
Yes the solubility can be calculated as 10 min is sufficien amount of time taken to stir the solution.
Definition of solubility: Solubility is defined as amount of solid that can be dissolved per liter of liquid.
Since after evaporation 0.40 of solid is left it is the amount that was dissolved in first place(Considering that there is no loss).
0.40 of liquid was dissolved in 4 liter of water so in 1 liter of water there was 0.10 Kg of X dissolved.
therefore the solubility is 0.10Kg/liter
Our answer has two significant digits as that of 0.40Kg.
The least number of significant figures in any number of the problem tells us the number of significant digits in the answer.
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