Multiple Choice
What is the solubility of M(OH)₂ in a 0.202 M solution of M(NO₃)₂, given that M(OH)₂ is sparingly soluble in water?
6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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What happens to sodium chloride when it dissolves in water?
A
It remains as a solid at the bottom of the container.
B
It forms a covalent bond with water molecules.
C
It dissociates into sodium and chloride ions.
D
It reacts with water to form sodium hydroxide and hydrochloric acid.
Verified step by step guidance1
Understand that sodium chloride (NaCl) is an ionic compound composed of sodium ions (Na+) and chloride ions (Cl-).
When NaCl is added to water, the polar water molecules interact with the ions. The partially negative oxygen atoms in water molecules are attracted to the positive sodium ions, while the partially positive hydrogen atoms are attracted to the negative chloride ions.
This interaction between water molecules and the ions overcomes the ionic bonds holding the NaCl lattice together, causing the NaCl to dissociate into its constituent ions.
The dissociation process results in the formation of free sodium ions (Na+) and chloride ions (Cl-) in the solution, which are surrounded by water molecules, a process known as solvation.
This dissociation is a physical change, not a chemical reaction, meaning no new substances are formed, and the ions remain in solution as Na+ and Cl-.
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