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 ().

Note: "major" chemical species are those present in concentrations greater than .

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 ().

Note: "major" chemical species are those present in concentrations greater than  .

anonymous · Answer

These are the answers, but I don't understand how to get to these. Please help, I want to know how to do this.
Compound          Formula         major species present when dissolved in water

Fructose               C6H12O6       C6H12O6, H2O
Potassium Cyanide   KCN                K +, CN -, H2O
iron (II) bromide     FeBr2            Fe 2+, Br -, H2O

vincent-lyon.fr · Answer

Correct!

anonymous · Answer

I know that it is correct, but I don't understand how to get there.
I need an explanation, please.

joannablackwelder · Answer

Fructose is a covalent molecule, thus it remains as a molecule once dissolved. The others are ionic and soluble in water (by a solubility table) and, thus, would exist as ions in water.

anonymous · Answer

Thank you