When [ ] are around an ion, what does it represent? it is an aqueous solution. the concentration of the ion is in moles/liter. the ion is reacting.

The concentration of the ion is in moles/liter.

Explanation: The concentration of any substance is represented bu putting the symbol of that substance inside a square bracket and the concentration represents the molarity of that solution.

Concentration of is written as

Molarity : It is defined as the number of moles of solute present in one liter of solution.

Formula used :

where,

n = moles of solute

= volume of solution in L

If a solution is aqueous, it is written by writing (aq) after the chemical formula of the substance.

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error