Which substance is the most soluble in water?
I wasn't able to decide between 1 and 4, as both have hydroxides, but the answer is 1. How?
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For primary alcohols, the trend is the longer the chain, the less soluble.
However, at room temperature, methanol, ethanol and propanol are all completely miscible with water.
At lower temperature, below the freezing point of water, there is finite solubility.
See the phase diagram that is Fig. 1 in CRYSTAL GROWTH OF WATER ETHANOL MIXTURE and that in Fig. 1 of Solid-Liquid Phase Diagram of the System Methanol-Water
Which alcohol would you choose for windshield deicing solution?
How does a alcohol get soluble in water? The H2O molecule acts as bipolar and the +ve pole forms some weak hydrogen attraction(name this 'bond' if you like) with the oxygen of alcohol. Now its obvious , the more bulkier the group around oxygen ,the less space around oxygen to form this bond. Hence CH3OH is more soluble in water than C2H5OH. After all , C2H5- group is more soluble than CH3- group.