50 g of common salt is added to 100 g of water at 20 ℃. Observe the solution given below and fill in the blanks. (Solubility of salt in 100 g water is 36 g at 20 ℃)
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a) The salt solution is ___________.
b) The undissolved salt can be dissolved by _________ the temperature.
c) The undissolved salt can be separated by ___________.