Question

Rank the following substances in order from most soluble in water to least soluble in water: ethane, C2H6; 1-pentanol, C5H11OH; potassium chloride, KCl; and propane, C3H8.
Rank from most to least soluble in water. To rank items as equivalent, overlap them.
Most soluble Least soluble

Answer 1

Answer:

Explanation:

The substances are:

-) Ethane, $C_2H_6$

-) 1-pentanol, $C_5H_1_1OH$

-) Potassium chloride, $KCl$

-) Propane,  $C_3H_8$

For this question, we have to remember the structure of water. Due to the electronegativity difference between oxygen and hydrogen in this structure, we will have the formation of dipoles. The dipoles interact better with net charges, due to this, the Potassium chloride is the compound with highest solubility (due to the formation of a cation and an anion):

$KC~l->~K^~+~Cl^-$

Then, in 1-pentanol we an "OH". This structure due to the presence of the hydroxyl group can form hydrogen bonds. Therefore,  this compound would be the second more soluble.

Finally,  the difference between propane and ethane is a carbon. In propane, we have an additional carbon. If we have more carbons we will have more area of ​​interaction. If we have more area we will have more solubility therefore propane is more soluble than ethanol.

In conclusion, the rank from most soluble to least soluble is:

1) Potassium chloride, $KCl$

2) 1-pentanol, $C_5H_1_1OH$

3) Propane,  $C_3H_8$

4) Ethane, $C_2H_6$

I hope it helps!

Answer 2

Order of solubility in water will be:

KCl > C₅H₁₁OH > C₃H₈ > C₂H₆

Solubility in water:

Any solvent soluble in water due to its polarity and ability to form hydrogen bonds. The presence of hydrogen bonding between molecules of a substance indicates that the molecules are polar. This means the molecules will be soluble in a polar solvent such as water.

Substances that are given:

Ethane(C₂H₆), 1-pentanol(C₅H₁₁OH), Potassium chloride(KCl) and propane(C₃H₈).

We will look at each compound one by one:

• Potassium chloride is an ionic compound, it has ionic interactions between its solubility in water is highest due to the formation of potassium ($K^{+}$) and ($Cl^{-}$) ions.
• In 1-pentanol, there is presence of hydroxyl group thus it can easily form hydrogen bonds with water. Therefore it will be soluble in water and comes after potassium chloride in ranking order.

• In ethane and propane molecule, there is one extra carbon in case of propane due to which it leads to the more area for interactions therefore more area for interaction leads to more solubility thus propane is more soluble than ethane in water.

Order of solubility in water will be:

KCl > C₅H₁₁OH > C₃H₈ > C₂H₆

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