Vivian Chua Zi Xuan's answer to Merlion's Secondary 1 Science Singapore question.
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a) The two factors are types of solute and types of solvent
b) First we add alcohol to the three solids to dissolve solid Q and filter the undissolved solids using filter paper (which will be P and R since they cannot be dissolved in alcohol). Next we add water to the mixture of solids P and R. (this is to dissolve solid P to obtain a solution) and filter off the undissolved solid R. Retain the solution and evaporate it to dryness to obtain solid P.
b) First we add alcohol to the three solids to dissolve solid Q and filter the undissolved solids using filter paper (which will be P and R since they cannot be dissolved in alcohol). Next we add water to the mixture of solids P and R. (this is to dissolve solid P to obtain a solution) and filter off the undissolved solid R. Retain the solution and evaporate it to dryness to obtain solid P.
Date Posted:
4 years ago
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