The names and chemical formulae of some chemical compounds are written in the fi

Question

The names and chemical formulae of some chemical compounds are written in the first two columns of the table below. Each compound is soluble in water. Imagine that a few tenths of a mole of each compound is dissolved in a liter of water. Then, write down in the third column of the table the chemical formula of the major chemical species that will be present in this solution. For example, you know water itself will be present, so you can begin each list with the chemical formula for water (H20) Note: "major" chemical species are those present in concentrations greater than 10 6 moVL. compouned major species present when dissolved in water formula ZnCI2 CH,o propylene glyclHOH) zinc chloride isopropanol

Explanation / Answer

Zinc chloride (ZnCl2) is an ionic compound and ionizes completely in aqueous solutions to give zinc (Zn2+) and chloride (Cl-) ions as below.

ZnCl2 (aq) -------> Zn2+ (aq) + 2 Cl- (aq)

Isopropanol, C3H8O and propylene glycol, C3H6(OH)2 are molecular compounds and do not ionize in water. They remain bonded loosely to water (H2O) molecules via hydrogen bonding.

Compound

Formula

Major species present when dissolved in water

Zinc chloride

ZnCl2

H2O, Zn2+, Cl-

Isopropanol

C3H8O

H2O, C3H8O

Propylene glycol

C3H6(OH)2

H2O, C3H6(OH)2

Compound

Formula

Major species present when dissolved in water

Zinc chloride

ZnCl2

H2O, Zn2+, Cl-

Isopropanol

C3H8O

H2O, C3H8O

Propylene glycol

C3H6(OH)2

H2O, C3H6(OH)2

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